taxonID	type	description	language	source
C55987A1811DFFD7338DFD420EC6FF08.taxon	diagnosis	Revised diagnosis: The shell is of medium to moderately large size and the thickness varies from hard and robust in some species (N. magellanica, N. deaurata, N. delesserti, N. terroris, N. concinna and N. clypeater) to thin and fragile in others (N. kerguelenensis, N. flammea, N. edgari, N. yaghana sp. nov. and N. mytilina). The shell morphology is typically elliptical, high-arched, with the apex strongly curved forward and downward, sometimes almost at the anterior end. The surface of the shell varies from very smooth (e. g. N. mytilina) to strongly radially ridged (e. g. N. magellanica). The external shell colour is pale-olive to brownish, the apex coppery; the inside is silvery iridescent to reddish bronze. Remarks: Based on shell morphology, the genus Nacella has traditionally been divided into Nacella s. str. and the subgenus Patinigera (Powell, 1973). Members of Nacella s. str. are characterized by a thin and fragile shell, they inhabit seaweeds and are restricted to southern South America (N. mytilina) and the Kerguelen Islands (N. kerguelenensis), whereas the remaining species were included in Patinigera and exhibit solid shells, are typical inter- and subtidal rocky dwellers, grazers and are broadly distributed in the Southern Ocean. Nevertheless, the distinction between Nacella and Patinigera was not corroborated by molecular analyses; indeed, the respective type species are very closely related (González-Wevar et al., 2010, 2011 a, 2017; this study). NACELLA YAGHANA GONZÁLEZ- WEVAR & NAKANO	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	description	(FIG. 3)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	synonymic_list	Patinigera clypeata – Dell, 1964: 273.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	materials_examined	Material studied: Coquimbo (29 ° 58 ’ 04.68 ’’ S, 71 ° 22 ’ 00.79 ’’ W) N = 40; Valparaíso (33 ° 00 ’ 56.98 ’’ S, 71 ° 33 ’ 39.62 ’’ W) N = 25; Pichilemu (34 ° 25 ’ 29.96 ’’ S, 72 ° 02 ’ 39.31 ’’ W) N = 20; Tubul (37 ° 13 ’ 11.09 ’’ S, 73 ° 26 ’ 35.55 ’’ W) N = 35; Mehuín (39 ° 26 ’ 39.04 ’’ S, 73 ° 13 ’ 52.63 ’’ W) N = 25; La Misión (39 ° 47 ’ 44.48 ’’ S, 73 ° 23 ’ 59.17 ’’ W) N = 40; Pucatrihue (40 ° 32 ’ 39.92 ’’ S, 73 ° 43 ’ 16.68 ’’ W) N = 25. Shell: The shell shape and sculpture are relatively constant in the analysed individuals from different localities along the Chilean Central coast (Fig. 3 A – F). The species exhibits a conical morphology, dorsally depressed with a relatively thick and non-translucent shell (Fig. 3 A – C). The anterior part of the animal is laterally compressed (Fig. 3 D – F). The shell is large (maximum length 120 mm) with a low profile. The apex is situated at the anterior 30 % of the shell. The anterior slope of the shell is slightly concave, while the lateral and the posterior slopes are convex (Fig. 3 A – C). The aperture of the shell is circular. The surface of the shell is sculptured with fine, rounded near-radial ribs and concentric growth lines beginning below the apex. The margin of the shell is relatively even. The external coloration varies (grey, green and brown) with clear white, yellow and creamy ribs. The internal part of the shell exhibits silvery to pale bronze, with a brown spot that corresponds to the impression of the body.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	description	External anatomy: The ventral area of the foot and the mantle fold are creamy white coloured and the epipodial fringe is recognizable. The mantle fold is thin and bordered by a black narrow line. Mantle tentacles are in alternate series of three short ones and a slightly longer one and lack pigmentation (Fig. 3 G). The cephalic tentacles are not pigmented (Fig. 3 G). Radula: See Valdovinos & Rüth (2005) (Fig. 3 H). Distribution: Pacific margin of the Chilean coast between 42 ° S and 30 ° S (Fig. 3 I). Habitat: Low intertidal and subtidal rocky shores between 0 to 20 m depths. Comments: Field observation along the Chilean coast shows that N. clypeater exhibits a patchy distribution being highly abundant in some localities and completely absent at others. In fact, Aguilera (2011), in a rocky intertidal trophic study across the Chilean coast, did not record the presence of N. clypeater and, therefore, considered it as an uncommon inter- subtidal species. Population-based analyses in the species suggest that N. clypeater represents a single genetic unit across its distribution and exhibits extremely low levels of mtDNA (COI) genetic diversity across its distribution (unpublished data).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	distribution	Distribution: Pacific margin of the Chilean coast between 42 ° S and 30 ° S (Fig. 3 I). Habitat: Low intertidal and subtidal rocky shores between 0 to 20 m depths.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811FFFD43391F9300AC2F960.taxon	discussion	Comments: Field observation along the Chilean coast shows that N. clypeater exhibits a patchy distribution being highly abundant in some localities and completely absent at others. In fact, Aguilera (2011), in a rocky intertidal trophic study across the Chilean coast, did not record the presence of N. clypeater and, therefore, considered it as an uncommon inter- subtidal species. Population-based analyses in the species suggest that N. clypeater represents a single genetic unit across its distribution and exhibits extremely low levels of mtDNA (COI) genetic diversity across its distribution (unpublished data).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	description	(FIG. 4)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	discussion	Patinella magellanica atramentosa – Strebel, 1907: 146, pl. 6, figs 86, 88; pl. 7, figs 91, 92, 94, 95. Patinella aenea var. minor Strebel, 1907: 137, pl. 5, fig. 67 a – d.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	synonymic_list	Patinigera chiloensis – Dell, 1964: 273. Patinigera magellanica venosa – Dell, 1964: 273.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	synonymic_list	Nacella (Patinigera) magellanica chiloensis – Ramírez, 1981: 55.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	synonymic_list	Nacella (Patinigera) chiloensis – Valdovinos & Rüth, 2005: 497. Nacella (Patinigera) venosa – Valdovinos & Rüth, 2005: 510. Nacella venosa – González-Wevar et al., 2011 a: 1937.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	discussion	Nacella chiloensis – González-Wevar et al., 2011 a: 1937. Nacella magallanica [sic.] – Ojeda et al., 2014: 504.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	materials_examined	Material studied: Puerto Montt; Reloncaví Fjord (41 ° 28 ’ 32.78 ’’ S, 72 ° 55 ’ 15.04 ’’ W) N = 30; Metri, Reloncaví Fjord (41 ° 35 ’ 37.30 ’’ S, 72 ° 42 ’ 42.80 ’’ W) N = 25; Ancud, Chiloé Island (41 ° 53 ’ 00.69 ’’ S, 73 ° 49 ’ 52.29 ’’ W) N = 25; Concoto Island, Pacific Patagonia (44 ° 14 ’ 41.60 ’’ S, 73 ° 37 ’ 05.68 ’’ W) N = 35; Puerto Aguirre, Pacific Patagonia (45 ° 09 ’ 57.09 ’’ S, 73 ° 32 ’ 27.07 ’’ W) N = 25; Costa Channel, Pacific Patagonia (45 ° 48 ’ 05.79 ’’ S, 74 ° 44 ’ 28.52 ’’ W) N = 40; Serrano Channel, Pacific Patagonia (46 ° 26 ’ 45.22 ’’ S, 73 ° 47 ’ 44.12 ’’ W) N = 30; Wager Island, Pacific Patagonia (47 ° 48 ’’ 33.22 ’’ S, 75 ° 00 ’ 45.33 ’’ W) N = 30; Madre de Dios Island, Pacific Patagonia (50 ° 07 ’ 09.82 ’’ S, 75 ° 15 ’ 24.79 ’’ W) N = 20; London Island, Pacific Patagonia (54 ° 40 ’ 00.30 ’’ S, 72 ° 03 ’ 58.67 ’’ W) N = 30; Carlos III Island, Strait of Magellan (53 ° 38 ’ 55.41 ’’ S, 72 ° 15 ’ 31.04 ’’ W) N = 30; Port Famine, Strait of Magellan (53 ° 36 ’ 34.07 ’’ S, 70 ° 55 ’ 53.40 ’’ W) N = 50; Otway Sound, Strait of Magellan (52 ° 56 ’ 13.10 ’’ S, 71 ° 11 ’ 39.07 ’’ W) N = 30; Chabunco, Strait of Magellan (52 ° 59 ’ 14.66 ’’ S, 70 ° 48 ’ 44.43 ’’ W) N = 30; Laredo Bay, Strait of Magellan (52 ° 56 ’ 59.14 ’’ S, 70 ° 48 ’ 03.96 ’’ W) N = 30; Possession Bay, Strait of Magellan (52 ° 13 ’ 55.50 ’’ S, 69 ° 17 ’ 50.71 ’’ W) N = 30; Santa María Bay, Tierra del Fuego (53 ° 19 ’ 29.86 ’’ S, 70 ° 22 ’ 34.30 ’’ W) N = 60; Caleta River, Tierra del Fuego (53 ° 51 ’ 45.32 ’’ S, 70 ° 19 ’ 54.11 ’’ W) N = 60; Pía Fjord, Beagle Channel (54 ° 49 ’ 36.81 ’’ S, 69 ° 39 ’ 11.31 ’’ W) N = 40; Garibaldi Fjord, Beagle Channel (54 ° 43 ’ 20.63 ’’ S, 69 ° 57 ’ 48.27 ’’ W) N = 50; Wulaia Bay (54 ° 59 ’ 20.30 ’’ S, 68 ° 09 ’ 02.97 ’’ W) N = 25; Tekenika Bay (55 ° 03 ’ 24.66 ’’ S, 68 ° 07 ’ 52.22 ’’ W) N = 30; Orange Bay (55 ° 27 ’ 21.44 ’’ S, 68 ° 04 ’ 02.33 ’’ W) N = 30; Virginia Bay, Beagle Channel (54 ° 54 ’ 16.95 ’’ S, 67 ° 56 ’ 05.35 ’’ W) N = 30; Puerto Williams, Beagle Channel (54 ° 56 ’ 04.95 ’’ S, 67 ° 36 ’ 48.33 ’’ W) N = 26; Lapataia Bay, Beagle Channel (54 ° 50 ’ 58.94 ’’ S, 68 ° 28 ’ 41.95 ’’ W) N = 30; Hornos Island, Cape Horn (55 ° 58 ’ 38.36 ’’ S, 67 ° 16 ’ 36.39 ’’ W) N = 30; Diego Ramírez Island, Cape Horn (56 ° 30 ’ 08.86 ’’ S, 68 ° 43 ’ 38.85 ’’ W) N = 25; Puerto Deseado, Atlantic Patagonia (47 ° 45 ’ 16.17 ’’ S, 65 ° 52 ’ 17.58 ’’ W) N = 25; Comodoro Rivadavia, Atlantic Patagonia (45 ° 51 ’ 52.17 ’’ S, 67 ° 28 ’ 25.50 ’’ W) N = 26; Hookers Point, Falkland / Malvinas Islands (51 ° 42 ’ 09.60 ’’ S, 57 ° 46 ’ 07.49 ’’ W) N = 50. Shell: The shell shape and sculpture are very variable in this species (de Aranzamendi et al., 2009; González- Wevar et al., 2011 a) (Fig. 4 A – C). The species exhibits a conical morphology, dorsally raised with a very thick and non-translucent shell (Fig. 4 A – F). The anterior part of the animal is laterally compressed (Fig 4 D – F). The shell is large (maximum length 140 mm), with a high profile. The apex is situated at the anterior 40 – 50 % of the shell’s length (Fig. 4 A – F). All the slopes of the shell are convex (Fig. 4 A – C). The aperture of the shell is oval. The surface of the shell is sculptured with raised angular primary radial ribs, weaker secondary ones and concentric growth lines across the interspaces. The margin of the shell is highly crenulated. The external coloration of the shell is very variable in the species across its distribution (pale reddish brown, white with dark lines, grey, green and brown). The primary and secondary ribs are brown ash-coloured to dark brown, with clearer interspaces. The internal part of the shell has soft metallic brown coloration with dark lines corresponding to external colour patterns, bordered by a white / brown halo.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	description	External anatomy: The ventral area of the foot is light grey and the epipodial fringe is recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternate series of three white shorter and a white longer one and are absent of pigmentation (Fig. 4 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 4 G). Radula: See Valdovinos & Rüth (2005) (Fig. 4 H). Distribution: Magellanic province. Pacific Patagonia from Chiloé Island to Cape Horn. Atlantic Patagonia from Tierra del Fuego to the Río Negro Province. Falkland / Malvinas Islands (Fig. 4 I). Habitat: High and medium intertidal rocky ecosystem between 0 and 25 m depths. Comments: The species is highly abundant, with a continuous distribution along Pacific Patagonia from Chiloé Island to Cape Horn, including fjords and channels, the Strait of Magellan and Tierra del Fuego, Cape Horn, Hornos Islands and Diego Ramírez Islands (Guzman, 1978; Rios & Gerdes, 1997; Linse, 1999; Reid & Osorio, 2000; Aldea & Rosenfeld, 2011; Gonzalez- Wevar et al., 2012 a; Ojeda et al., 2014; Rosenfeld et al., 2015). In the Atlantic, N. magellanica is also highly abundant up north to the Río Negro Province. However, along the Atlantic coast the distribution and abundance of N. magellanica depends on the availability of suitable rocky habitats (Bazterrica et al., 2007; de Aranzamendi et al., 2009, 2011, 2014). Similarly, N. magellanica is highly abundant in the Falkland / Malvinas Islands. Nacella magellanica comprises a single genetic unit throughout Pacific (González-Wevar et al., 2012 a) and Atlantic (de Aranzamendi et al. 2009, 2011) Patagonia, with Falkland / Malvinas Islands populations detectably different (González-Wevar et al., 2012 a). Molecular and geometric morphometric comparisons showed that N. chiloensis and N. venosa are synonyms of N. magellanica (González-Wevar et al., 2011 a).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	distribution	Distribution: Magellanic province. Pacific Patagonia from Chiloé Island to Cape Horn. Atlantic Patagonia from Tierra del Fuego to the Río Negro Province. Falkland / Malvinas Islands (Fig. 4 I). Habitat: High and medium intertidal rocky ecosystem between 0 and 25 m depths.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1811EFFD93391F91F09E3FDFE.taxon	discussion	Comments: The species is highly abundant, with a continuous distribution along Pacific Patagonia from Chiloé Island to Cape Horn, including fjords and channels, the Strait of Magellan and Tierra del Fuego, Cape Horn, Hornos Islands and Diego Ramírez Islands (Guzman, 1978; Rios & Gerdes, 1997; Linse, 1999; Reid & Osorio, 2000; Aldea & Rosenfeld, 2011; Gonzalez- Wevar et al., 2012 a; Ojeda et al., 2014; Rosenfeld et al., 2015). In the Atlantic, N. magellanica is also highly abundant up north to the Río Negro Province. However, along the Atlantic coast the distribution and abundance of N. magellanica depends on the availability of suitable rocky habitats (Bazterrica et al., 2007; de Aranzamendi et al., 2009, 2011, 2014). Similarly, N. magellanica is highly abundant in the Falkland / Malvinas Islands. Nacella magellanica comprises a single genetic unit throughout Pacific (González-Wevar et al., 2012 a) and Atlantic (de Aranzamendi et al. 2009, 2011) Patagonia, with Falkland / Malvinas Islands populations detectably different (González-Wevar et al., 2012 a). Molecular and geometric morphometric comparisons showed that N. chiloensis and N. venosa are synonyms of N. magellanica (González-Wevar et al., 2011 a).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	description	(FIG. 5) Patella aenea Martyn, 1784: pl. 1, fig. 17 (invalid).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	synonymic_list	Nacella strigatella Rochebrune & Mabille, 1885: 110.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	discussion	Nacella (Patinigera) aenea – Wenz, 1938: 328, fig. 401. Patinigera aenea – Powell, 1951: 82.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	synonymic_list	Patinigera fuegiensis – Powell, 1955: 67.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	discussion	Nacella (Patinigera) deaurata form delicatissima – Powell, 1973: 195; pl. 178, figs 3, 4; Ramirez, 1981: 57; Linse, 1999: 400.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	discussion	Nacella (Patinigera) fugiensis [sic.] – Linse, 1999: 400. Nacella (Patinigera) magellanica – Valdovinos & Rüth, 2005: 509 (in part, not of Helbling).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	synonymic_list	Nacella fuegiensis – González-Wevar et al., 2011 a: 1937.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	materials_examined	Material studied: London Island, Pacific Patagonia (54 ° 40 ’ 00.30 ’’ S, 72 ° 03 ’ 58.67 ’’ W) N = 30; Carlos III Island, Strait of Magellan (53 ° 38 ’ 55.41 ’’ S, 72 ° 15 ’ 31.04 ’’ W) N = 20; Port Famine, Strait of Magellan (53 ° 36 ’ 34.07 ’’ S, 70 ° 55 ’ 53.40 ’’ W) N = 50; Otway Sound, Strait of Magellan (52 ° 56 ’ 13.10 ’’ S, 71 ° 11 ’ 39.07 ’’ W) N = 30; Chabunco, Strait of Magellan (52 ° 59 ’ 14.66 ’’ S, 70 ° 48 ’ 44.43 ’’ W) N = 30; Laredo Bay, Strait of Magellan (52 ° 56 ’ 59.14 ’’ S, 70 ° 48 ’ 03.96 ’’ W) N = 50; Possession Bay, Strait of Magellan (52 ° 13 ’ 55.50 ’’ S, 69 ° 17 ’ 50.71 ’’ W) N = 30; Santa María Bay, Tierra del Fuego (53 ° 19 ’ 29.86 ’’ S, 70 ° 22 ’ 34.30 ’’ W) N = 60; Caleta River, Tierra del Fuego (53 ° 51 ’ 45.32 ’’ S, 70 ° 19 ’ 54.11 ’’ W) N = 60; Pía Fjord, Beagle Channel (54 ° 49 ’ 36.81 ’’ S, 69 ° 39 ’ 11.31 ’’ W) N = 4 0; Gar ib a ldi F j or d, Beag l e C h anne l (54 ° 43 ’ 20.63 ’’ S, 69 ° 57 ’ 48.27 ’’ W) N = 30; Wulaia Bay (54 ° 59 ’ 20.30 ’’ S, 68 ° 09 ’ 02.97 ’’ W) N = 40; Tekenika Bay (55 ° 03 ’ 24.66 ’’ S, 68 ° 07 ’ 52.22 ’’ W) N = 30; Orange Bay (55 ° 27 ’ 21.44 ’’ S, 68 ° 04 ’ 02.33 ’’ W) N = 30; Virginia Bay, Beagle Channel (54 ° 54 ’ 16.95 ’’ S, 67 ° 56 ’ 05.35 ’’ W) N = 40; Puerto Williams, Beagle Channel (54 ° 56 ’ 04.95 ’’ S, 67 ° 36 ’ 48.33 ’’ W) N = 26; Lapataia Bay, Beagle Channel (54 ° 50 ’ 58.94 ’’ S, 68 ° 28 ’ 41.95 ’’ W) N = 40; Hookers Point, Falkland / Malvinas Islands (51 ° 42 ’ 09.60 ’’ S, 57 ° 46 ’ 07.49 ’’ W) N = 50. Shell: Shell shape and sculpture are very variable (de Aranzamendi et al., 2009) (Fig. 5 A – C). The species exhibits a conical morphology, dorsally raised shell, which is thick and non-translucent (Fig. 5 A – F). The anterior part of the animal is laterally compressed (Fig. 5 D – F). It has a large shell (maximum length 120 mm), which has a medium profile. The apex is located at the anterior 30 – 40 % of the shell’s length (Fig. 5 A – F). All the slopes of the shell are convex (Fig. 5 A – C). The aperture is oval to oblong. The surface of the shell is sculptured with numerous broad radial ribs and clearly defined concentric growth lines from the central zone towards the margin. The margin of the shell margin is highly crenulated. The external coloration of the shell is very variable across its distribution (pale reddish, brown, green with a bronze apex, grey, brown). The primary and secondary ribs are dark brown with clearer interspaces. The internal part of the shell has a soft metallic grey / brown interior with dark lines corresponding to external colour patterns, bordered by a white / brown halo.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	description	External anatomy: The ventral area of the foot is grey and the epipodial fringe is recognizable. The mantle fold is thick and cream-coloured. The mantle tentacles are in an alternated series of three shorter pigmented ones (white / black / white) and a black longer one (Fig. 5 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 5 G). Radula: See Valdovinos & Rüth (2005) (Fig. 5 H). Distribution: Magellanic province. Pacific Patagonia: from Guarello Island (50 ° S) to Cape Horn. Atlantic Patagonia: Tierra del Fuego. Falkland / Malvinas Islands (Fig. 5 I). Habitat: Medium and low intertidal, subtidal rocky ecosystem between 0 and 40 m depths. Comments: Our extensive sampling effort across Pa c i f i c Pa t a g o n i a s u g g e s t s t h a t N. d e a u r a t a occurs in this region from Guarello Island (50 ° S) to Cape Horn. In the Atlantic coast this species was reported north up to Mar del Plata province (Morris & Rosenberg, 2005). However, according to de Aranzamendi et al. (2009) the distribution of the species in the Atlantic is restricted to Tierra del Fuego. This species is also abundant in the Falkland / Malvinas Islands. Molecular analyses suggest that N. deaurata represents a single genetic unit along Pacific (González-Wevar et al., 2011 a) and Atlantic (de Aranzamendi et al., 2009, 2011) Patagonia. Molecular and geometric morphometric comparisons (González-Wevar et al., 2011 a) showed that N. fuegiensis is a synonym of N. deaurata. Similarly, molecular analyses indicate that N. delicatissima represents particular morphotypes of N. deaurata (contra de Aranzamendi et al., 2009). Molecular analyses (unpublished data) indicate that N. deaurata exhibits marked levels of population genetic differentiation between Patagonia and the Falkland / Malvinas Islands.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	distribution	Distribution: Magellanic province. Pacific Patagonia: from Guarello Island (50 ° S) to Cape Horn. Atlantic Patagonia: Tierra del Fuego. Falkland / Malvinas Islands (Fig. 5 I). Habitat: Medium and low intertidal, subtidal rocky ecosystem between 0 and 40 m depths.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18113FFDF3397FD9C0A95FCD1.taxon	discussion	Comments: Our extensive sampling effort across Pa c i f i c Pa t a g o n i a s u g g e s t s t h a t N. d e a u r a t a occurs in this region from Guarello Island (50 ° S) to Cape Horn. In the Atlantic coast this species was reported north up to Mar del Plata province (Morris & Rosenberg, 2005). However, according to de Aranzamendi et al. (2009) the distribution of the species in the Atlantic is restricted to Tierra del Fuego. This species is also abundant in the Falkland / Malvinas Islands. Molecular analyses suggest that N. deaurata represents a single genetic unit along Pacific (González-Wevar et al., 2011 a) and Atlantic (de Aranzamendi et al., 2009, 2011) Patagonia. Molecular and geometric morphometric comparisons (González-Wevar et al., 2011 a) showed that N. fuegiensis is a synonym of N. deaurata. Similarly, molecular analyses indicate that N. delicatissima represents particular morphotypes of N. deaurata (contra de Aranzamendi et al., 2009). Molecular analyses (unpublished data) indicate that N. deaurata exhibits marked levels of population genetic differentiation between Patagonia and the Falkland / Malvinas Islands.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	description	(FIG. 6)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	synonymic_list	Patella conchacea Gmelin, 1791: 3708. Nacella mytiloides Schumacher, 1817: 179.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	synonymic_list	Patella cymbuloides Lesson, 1830: 422. Patella hyalina Philippi, 1845: 59. Patella vitrea Philippi, 1845: 60. Patella cymbium Philippi, 1845: 60.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	discussion	Nacella (Patinigera) mytilina [sic.] – Linse, 1999: 400. Nacella mytelina [sic.] Adami & Gordillo, 1999: 186.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	materials_examined	Studied material: Tamar Island, Strait of Magellan (52 ° 53 ’ 48.04 ’’ S, 73 ° 47 ’ 15.03 ’’ W) N = 20; Duntze Sound, Strait of Magellan (54 ° 19 ’ 22.32 ’’ S, 73 ° 48 ’ 12.11 ’’ W) N = 20; London Island, Pacific Patagonia (54 ° 40 ’ 00.30 ’’ S, 72 ° 03 ’ 58.67 ’’ W) N = 24; Carlos III Island, Strait of Magellan (53 ° 38 ’ 55.41 ’’ S, 72 ° 15 ’ 31.04 ’’ W) N = 50; Port Famine, Strait of Magellan (53 ° 36 ’ 34.07 ’’ S, 70 ° 55 ’ 53.40 ’’ W) N = 50; Carrera Point, Strait of Magellan (53 ° 35 ’ 10.92 ’’ S, 70 ° 55 ’ 24.14 ’’ W) N = 30; Otway Sound, Strait of Magellan (52 ° 56 ’ 13.10 ’’ S, 71 ° 11 ’ 39.07 ’’ W) N = 25; Chabunco, Strait of Magellan (52 ° 59 ’ 14.66 ’’ S, 70 ° 48 ’ 44.43 ’’ W) N = 30; Laredo Bay, Strait of Magellan (52 ° 56 ’ 59.14 ’’ S, 70 ° 48 ’ 03.96 ’’ W) N = 30; Possession Bay, Strait of Magellan (52 ° 13 ’ 55.50 ’’ S, 69 ° 17 ’ 50.71 ’’ W) N = 30; Santa María Bay, Tierra del Fuego (53 ° 19 ’ 29.86 ’’ S, 70 ° 22 ’ 34.30 ’’ W) N = 40; Caleta River, Tierra del Fuego (53 ° 51 ’ 45.32 ’’ S, 7 0 ° 1 9 ’ 5 4.1 1 ’’ W) N = 3 0; Virginia Bay, Beagle Channel (54 ° 54 ’ 16.95 ’’ S, 67 ° 56 ’ 05.35 ’’ W) N = 30; Puerto Williams, Beagle Channel (54 ° 56 ’ 04.95 ’’ S, 67 ° 36 ’ 48.33 ’’ W) N = 35; Hookers Point, Falkland / Malvinas Islands (51 ° 42 ’ 09.60 ’’ S, 57 ° 46 ’ 07.49 ’’ W) N = 40. Shell: The shell shape and sculpture are relatively variable in the analysed individuals across the species’ distribution (Fig. 6 A – C). The species exhibits a conical morphology, oblique with a very thin and translucent shell (Fig. 6 A – F). The anterior part of the animal is laterally compressed (Fig. 6 D – F). It has a medium shell size (maximum length 90 mm) and a medium profile. The apex is situated at the anterior 10 % of the shell’s length, anteriorly directed and curved toward the border. The anterior slope of the shell is concave, while the posterior and lateral ones are convex (Fig. 6 A – F). The aperture of the shell is oval to oblong. The surface of the shell has a sculpture of a few radial ribs, more obvious in the anterior zone, and concentric growth lines, which increase in thickness towards the shell margin. The margin of the shell is relatively even. The external coloration varies (pearly cream, yellow and light brown with darker tones towards the margin with a brown / red apex). The internal part of the shell is simple with white nacreous coloration.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	description	External anatomy: The ventral area of the foot varies from dark grey to black and the epipodial fringe is highly recognizable (Fig. 6 G). The mantle fold is narrow and cream-coloured. The mantle tentacles are in alternated series of three white shorter ones and a white longer one (Fig. 6 G). Nevertheless, some individuals also exhibit a configuration of three shorter (white / black / white) and a black longer one. The cephalic tentacles are dorsally pigmented with a black line (Fig. 6 G) Radula: See Valdovinos & Rüth (2005) (Fig. 6 H). Distribution: Magellanic province. Pacific Patagonia: from Guarello Island (50 ° S) to Cape Horn (56 ° S). Atlantic Patagonia: Tierra del Fuego to Puerto Deseado (47 ° S). Falkland / Malvinas Islands (Fig. 6 I). Habitat: Nacella mytilina is regularly found on macroalgae (Macrocystis, Gigartina and Lessonia; Rosenfeld et al., 2015) but in some localities individuals can also be found on inter- and subtidal rocks. Comments: The previously recognized distribution of N. mytilina included the Magellanic province and the Kerguelen Archipelago (Powell, 1955, 1957, 1973; Cantera & Arnaud, 1985; Troncoso et al., 2001), as well as Antarctica (Castellanos & Landoni, 1988). Cantera & Arnaud (1985) treated N. kerguelenensis from the Kerguelen Islands as a junior synonym of N. mytilina. However, recent multi-locus molecular analyses have demonstrated that kelp-associated N. mytilina - like individuals from the Kerguelen Islands represent a particular morphotype of N. kerguelenensis, which is genetically distinct from N. mytilina (González-Wevar et al., 2017). At the same time, no confirmed record exists for N. mytilina in Antarctica or in peri-Antarctic islands, such as South Shetlands Islands or South Orkneys. Accordingly, the distribution of N. mytilina is restricted to southern South America and the Falkland / Malvinas Islands. As recorded for other Patagonian marine invertebrates (Leese et al., 2008; González-Wevar et al., 2012 a, 2018), N. mytilina exhibits population-level genetic differentiation between Pacific Patagonia and the Falkland / Malvinas Islands (González-Wevar et al., 2016 a).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	distribution	Distribution: Magellanic province. Pacific Patagonia: from Guarello Island (50 ° S) to Cape Horn (56 ° S). Atlantic Patagonia: Tierra del Fuego to Puerto Deseado (47 ° S). Falkland / Malvinas Islands (Fig. 6 I). Habitat: Nacella mytilina is regularly found on macroalgae (Macrocystis, Gigartina and Lessonia; Rosenfeld et al., 2015) but in some localities individuals can also be found on inter- and subtidal rocks.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18115FFDD338FFCBB090CFE02.taxon	discussion	Comments: The previously recognized distribution of N. mytilina included the Magellanic province and the Kerguelen Archipelago (Powell, 1955, 1957, 1973; Cantera & Arnaud, 1985; Troncoso et al., 2001), as well as Antarctica (Castellanos & Landoni, 1988). Cantera & Arnaud (1985) treated N. kerguelenensis from the Kerguelen Islands as a junior synonym of N. mytilina. However, recent multi-locus molecular analyses have demonstrated that kelp-associated N. mytilina - like individuals from the Kerguelen Islands represent a particular morphotype of N. kerguelenensis, which is genetically distinct from N. mytilina (González-Wevar et al., 2017). At the same time, no confirmed record exists for N. mytilina in Antarctica or in peri-Antarctic islands, such as South Shetlands Islands or South Orkneys. Accordingly, the distribution of N. mytilina is restricted to southern South America and the Falkland / Malvinas Islands. As recorded for other Patagonian marine invertebrates (Leese et al., 2008; González-Wevar et al., 2012 a, 2018), N. mytilina exhibits population-level genetic differentiation between Pacific Patagonia and the Falkland / Malvinas Islands (González-Wevar et al., 2016 a).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18117FFDD3398FDF50E29FBCB.taxon	description	(FIG. 7)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18117FFDD3398FDF50E29FBCB.taxon	materials_examined	Material studied: Melimoyu (43 º 03 ’ 33.63 ’’ S, 73 º 15 ’ 12.55 ’’ W) N = 25; Port Famine, Strait of Magellan (53 º 36 ’ 34.07 ’’ S, 70 º 55 ’ 53.40 ’’ W) N = 50; Laredo Bay, Strait of Magellan (52 º 56 ’ 59.14 ’’ S, 70 º 48 ’ 03.96 ’’ W) N = 30; Tekenika Bay (55 º 03 ’ 24.66 ’’ S, 68 º 07 ’ 52.22 ’’ W) N = 40; Puerto Williams, Beagle Channel (54 º 56 ’ 04.95 ’’ S, 67 º 36 ’ 48.33 ’’ W) N = 40; Hookers Point, Falkland / Malvinas Islands (51 º 42 ’ 09.60 ’’ S, 57 º 46 ’ 07.49 ’’ W) N = 25. Shell: The shell shape and sculpture are relatively constant in the analysed individuals (Fig. 7 A – C). The species exhibits a conical morphology, dorsally depressed with a thin and relatively translucent shell (Fig. 7 A – F). The anterior part of the animal is laterally compressed (Fig. 7 D – F). It has a medium shell size (maximum length 80 mm) and a low profile. The apex is situated at the anterior 30 – 40 % of the shell’s length. All the slopes of the shell are regularly straight (Fig. 7 A – F). The aperture of the shell is oval to oblong. The surface of the shell is sculptured with radial ribs, more obvious in the anterior zone, and concentric growth lines, which increase in thickness towards the shell margin. The margin of the shell is relatively even. The external coloration is quite constant in the analysed individuals with a white coloration pattern with light brown / grey / purple rays. Some rays beginning below the apical zone, others at the margin. The internal part of the shell exhibits a nacreous halo and a dun-brown spot corresponding to the animal’s body impression. Nacella flammea individuals exhibit similar internal and external coloration patterns. External anatomy: The ventral area of the foot is white to light grey and the epipodial fringe is recognizable (Fig. 7 G). The mantle fold is thick and creamy coloured. The mantle tentacles are in alternated series of three white shorter ones and a light grey longer one (Fig. 7 G). The cephalic tentacles are not pigmented (Fig. 7 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and sharp pointed, with two cusps. The second laterals are broader, wider spaced, with three short cusps (Fig. 7 H). Distribution: Magellanic province. Pacific Patagonia: from Melimoyu (44 ° S) to Cape Horn (56 ° S). Atlantic Patagonia: Tierra del Fuego. Falkland / Malvinas Islands (Fig. 7 I). Habitat: Subtidal rocky ecosystem between 5 and 40 m. Comments: Field observations along the Magellanic province reveal that N. flammea exhibits a patchy distribution, being highly abundant in some localities and completely absent at others. Nevertheless, preliminary population-based analyses of the species suggest that it represents a single genetic unit across its distribution (unpublished data). This revision extends the known northern limit of this species to the Melimoyu Islands (44 º 03 ’ 33.63 ’’ S, 73 º 15 ’ 12.55 ’’ W).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18117FFC230EBFBAF0A67F9A2.taxon	description	(FIG. 8)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18117FFC230EBFBAF0A67F9A2.taxon	materials_examined	Material studied: Rothera Station, Adelaide Island, Antarctic Peninsula (67 ° 34 ’ 03.17 ’’ S, 68 ° 07 ’ 17.40 ’’ W) N = 50; South Bay, Anvers Island (64 ° 53 ’ 21.55 ’’ S, 63 ° 35 ’ 43.44 ’’ W) N = 40; Yelcho Station, Doumer Island, Palmer Archipelago, Antarctic Peninsula (64 ° 53 ’ 34.29 ’’ S, 63 ° 35 ’ 09.04 ’’ W) N = 40; Covadonga Bay, Antarctic Peninsula (63 ° 19 ’ 13.96 ’’ S, 57 ° 53 ’ 54.15 ’’ W) N = 50, James Ross Island, East Antarctic Peninsula (63 ° 55 ’ 14.33 ’’ S, 57 ° 15 ’ 54.22 ’’ W) N = 40, Hannah Point, Livingstone Island, South Shetland Islands (62 ° 39 ’ 11.31 ’’ S, 60 ° 36 ’ 55.44 ’’ W) N = 40; Fildes Bay, King George Island, South Shetland Islands (62 ° 12 ’ 28.68 ’’ S, 58 ° 57 ’ 24.89 ’’ W) N = 80, Admiralty Bay, King George Island, South Shetland Islands (62 ° 05 ’ 14.40 ’’ S, 58 ° 27 ’ 29.57 ’’ W) N = 80; Deception Island (62 ° 55 ’ 14.52 ’’ S, 60 ° 35 ’ 14.62 ’’ W) N = 50; Elephant Island (61 ° 05 ’ 12.24 ’’ S, 55 ° 20 ’ 22.54 ’’ W) N = 29; South Orkney Island (60 ° 44 ’ 20.03 ’’ S, 44 ° 44 ’ 17.05 ’’ W) N = 26; Signy Island, South Orkneys Islands (60 ° 43 ’ 22.22 ’’ S, 45 ° 35 ’ 16.14 ’’ W) N = 30; South Georgia (54 ° 17 ’ 00.11 ’’ S, 36 ° 29 ’ 13.04 ’’ W) N = 100. Shell: The shell shape and sculpture are very variable (Beaumont & Wei, 1991; de Aranzamendi et al., 2008; Hoffman et al., 2010 b; González-Wevar et al., 2011 b) (Fig. 8 A – C). The species exhibits a conical morphology, dorsally raised, with a thick and non-translucent shell (Fig. 8 A – F). The anterior part of the animal is laterally compressed (Fig. 8 D – F). It has a large shell (maximum length 120 mm) and a variable profile (Fig. 8 A – C). The apex is situated at the anterior 30 – 40 % of the shell’s length (Fig. 8 A – C). All the slopes of the shell are convex (Fig. 8 D – F). The aperture of the shell is oval. The surface of the shell is sculptured with weak primary radial ribs, weaker secondary ones and concentric growth lines. The margin of the shell is highly crenulated. The external coloration is very variable (pale brownish / green / grey to dark brown and black). The internal part of the shell varies from creamy nacreous to dark bronzy-brown with dark lines corresponding to external colour patterns. External anatomy: The ventral area of the foot is black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternate series of a single black longer tentacle and three shorter ones (white / black / white) (Fig. 8 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 8 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, of medium length and with two spoon-like cusps. The second laterals are broader, wider spaced, with two spoonlike cusps. One of them is very small and the other is bigger and broader (Fig. 8 H). Distribution: Maritime Antarctica, including ice-free rocky ecosystems of the Antarctic Peninsula, the South Shetland Islands, South Georgia, South Orkneys, Bouvet, Elephant Island, Seymour Island, Paulet Island, Wander Island, Anvers Island and Peterman Island (Fig. 8 I). Habitat: Intertidal and subtidal between 0 and 150 m depths. Comments: The Antarctic limpet represents a single genetic population along maritime Antarctica (González-Wevar et al., 2011 b, 2013, 2016 b, 2017), but thispopulationdifferesmarkedlyfromthosefromSouth Georgia (González-Wevar et al., 2013). The inter- and subtidal morphotypes were once regarded as separate subspecies, N. polaris polaris and N. polaris concinna (Powell, 1951). Nevertheless, genetic comparisons using allozymes (Beaumont & Wei, 1991), mtDNA (González-Wevar et al., 2011 b, 2013, 2016 b) and AFLPs (Hoffman et al., 2010 b) confirmed that these forms represent a single evolutionary unit. Accordingly, shell height, shape and sculpture differences in the Antarctic limpet represent phenotypic plasticity in the species.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18108FFC13398F9480B98F8B2.taxon	description	(FIG. 9)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18108FFC13398F9480B98F8B2.taxon	materials_examined	Material studied: Trypot Beach, Marion Island (46 ° 52 ’ 33.91 ’’ S, 37 ° 51 ’ 51.40 ’’ E) N = 50; Ships Cove, Marion Island (46 ° 51 ’ 16.22 ’’ S, 37 ° 50 ’ 42.36 ’’ E) N = 40; Crozet Islands (46 ° 25 ’ 34.25 ’’ S, 51 ° 51 ’ 42.50 ’’ E) N = 50. Shell: The shell shape and sculpture are relatively constant (Fig. 9 A – C). The species exhibits a conical morphology, dorsally raised, with a very thick and non-translucent shell (Fig. 9 A – F). The anterior part of the animal is laterally compressed (Fig. 9 D – F). It has a medium-sized shell (maximum length 80 mm) and exhibits a variable profile. The apex is situated at the anterior 25 – 35 % of the shell’s length (Fig. 9 D – F). All the slopes of the shell are convex (Fig. 9 A – C). The aperture of the shell is oval. The surface of the shell exhibits low radial folds and lamellar growth lines. The margin of the shell is highly crenulated. The external coloration of the shell is relatively constant in the species: grey to white, with dark (brown and black) primary radial ribs. The internal part of the shell has a soft metallic-white coloration, with dark lines corresponding to external colour patterns, bordered by a white / brown halo.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18108FFC13398F9480B98F8B2.taxon	description	External anatomy: The ventral area of the foot is black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternate series of three shorter pigmented ones (white / black / white) and black longer one (Fig. 9 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 9 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and very sharp, with two cusps. The second laterals are broader, wider spaced, with four very sharp cusps (Fig. 9 H).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18108FFC13398F9480B98F8B2.taxon	distribution	Distribution: Marion, Prince Edward and Crozet Islands (Fig. 9 I). Habitat: High and medium intertidal rocky ecosystem between 0 and 30 m depths.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A18108FFC13398F9480B98F8B2.taxon	discussion	Comments: Nacella delesserti was first reported at Crozet Islands by Cantera & Arnaud (1985), a finding we confirm here. These authors also reported the species from South Georgia, but our sample of> 150 individuals consisted only of N. concinna. Zelaya (2005) also failed to find N delesserti at South Georgia. Hence, we consider N. delesserti to be restricted to Marion and Crozet Islands. Phylogenetic reconstructions placed N. delesserti as the sister species of N. concinna, their separation occurring around 0.35 Mya (González-Wevar et al., 2017). The presence of N. delesserti at sub-Antartctic Marion and Crozet Islands is thus the result of evolutionarily recent long-distance dispersal from maritime Antarctica. Nacella delesserti showed very low levels of genetic diversity that constitute evidence of recent postglacial expansion in Marion Island. Due to the exceptional high density and biomass of N. delesserti on Marion Island rocky shores, it plays an important role in the organization of intertidal and shallowwater benthic communities (Blankley & Branch, 1985).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810BFFC0300EF9EF0FF0FAFD.taxon	description	(FIG. 10)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810BFFC0300EF9EF0FF0FAFD.taxon	materials_examined	Material studied: Port-aux-Français, Kerguelen Islands (49 ° 21 ’ 09.84 ’’ S, 70 ° 13 ’ 05.89 ’’ E) N = 50; Port Christmas, Kerguelen Islands (48 ° 41 ’ 40.22 ’’ S, 69 ° 01 ’ 15.54 ’’ E) N = 60; Fjord des Portes Noires, Kerguelen Islands (49 ° 29 ’ 47.32 ’’ S, 69 ° 08 ’ 06.70 ’’ E) N = 50; Îles du Prince-de-Monaco, Kerguelen Islands (49 ° 36 ’ 47.24 ’’ S, 69 ° 14 ’ 11.38 ’’ E) N = 30; Baie des Cascades, Kerguelen Islands (49 ° 10 ’ 02.31 ’’ S, 70 ° 08 ’ 53.33 ’’ E) N = 30; Atlas Cove, Heard Island (53 ° 01 ’ 27.99 ’’ S, 73 ° 23 ’ 46.95 ’’ E) N = 10. Shell: The shell shape and sculpture are very variable in the species and two different morphotypes have been recorded at Kerguelen Islands: (1) a kelp-dweller (Fig. 10 A) and (2) a hard-substrate morphotype (Fig. 10 B, C). The shell and the sculpture of the hard-substrate morphotype are relatively constant in the analysed individuals, which exhibit a conical morphology, dorsally raised, with a very thick and non-translucent shell. The anterior part of the animal is laterally compressed (Fig. 10 A – D). The shell is large (maximum length 120 mm) and has a medium profile. The apex is located at the the anterior 30 % of the shell. All the slopes of the shell are convex. The aperture of the shell is oval. The surface of the shell is sculptured with weak radial folds. The margin of the shell is very crenulated. The external coloration varies from purplish brown to grey / white and the apex is reddish bronze. The internal part of the shell varies from light brown to purple with a metallic lustre and dark lines corresponding to external colour patterns bordered by a white / grey halo. The shell of the kelp-dweller morphotype resembles N. mytilina from the Magellanic province. This morphotype is conical, dorsally raised, with a very thin and translucent shell. The shell is of medium size (maximum length 60 mm), with a low profile. The apex is situated at the anterior 20 % of the shell, anteriorly directed and curved toward the border, and obtuse. The anterior slope is concave, while the posterior and lateral ones are convex. The aperture is oval. The surface of the shell is sculptured with a few radial ribs, more obvious in the anterior zone, with concentric growth lines. The margin of the shell is relatively even. The external and internal coloration of the shell is purple to brown, with darker tones toward the apex. External anatomy (for both morphotypes): The ventral area of the foot is dark grey to black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternated series of three shorter pigmented ones (white / black / white) and a black longer one (Fig. 10 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 10 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and sharp pointed, with two cusps. The second laterals are broader with four sharp cusps (Fig. 10 H). Distribution: Kerguelen and Heard Islands (Fig. 10 I). Nacella kerguelenensis is highly abundant and exhibits a continuous distribution in the Kerguelen Archipelago. The species is also broadly distributed on Heard Island. Habitat: The species occurs in the high and medium intertidal rocky ecosystem down to 40 m depths; it is also abundant grazing on macroalgae. Comments: As previously mentioned, the kelpassociated morphotype of N. kerguelenensis exhibits major parallels in terms of shell morphology, thickness and sculpture, as well as habitat preferences with the Patagonian N. mytilina. Recent molecular analyses determined that this kelp-associated morphotype at Kerguelen Islands fell within the genetic diversity recorded in N. kerguelenensis (González-Wevar et al., 2017). Accordingly, N. kerguelenesis is restricted to Kerguelen and Heard Islands (González-Wevar et al., 2010, 2017, this revision).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810AFFC530CDFA790E2CFE87.taxon	description	(FIG. 11)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810AFFC530CDFA790E2CFE87.taxon	materials_examined	Material studied: Port-aux-Français, Kerguelen Islands (49 ° 21 ’ 09.84 ’’ S, 70 ° 13 ’ 05.89 ’’ E) N = 40; Port Christmas, Kerguelen Islands (48 ° 41 ’ 40.22 ’’ S, 69 ° 01 ’ 15.54 ’’ E) N = 50; Fjord des Portes Noires, Kerguelen Islands (49 ° 29 ’ 47.32 ’’ S, 69 ° 08 ’ 06.70 ’’ E) N = 30; Îles du Prince-de-Monaco, Kerguelen Islands (49 ° 36 ’ 47.24 ’’ S, 69 ° 14 ’ 11.38 ’’ E) N = 50; Baie des Cascades, Kerguelen Islands (49 ° 10 ’ 02.31 ’’ S, 70 ° 08 ’ 53.33 ’’ E) N = 30; Atlas Cove, Heard Islands (53 ° 01 ’ 27.99 ’’ S, 73 ° 23 ’ 46.95 ’’ E) N = 5. Shell: The shell shape and sculpture are variable in the species and two different morphologies were recorded at Kerguelen (Fig. 11 A, B) and Heard Islands (Fig. 11 C), respectively. Individuals from the Kerguelen Islands exhibit a conical morphology, dorsally depressed, with a thin and translucent shell. The anterior part of the animal is laterally compressed (Fig. 11 D – F). The shell is of medium size (maximum length 80 mm) and has a low profile. The apex is located at the anterior 20 – 30 % of the shell. All the slopes of the shell are concave. The aperture is oval. The whole surface is crowded with concentric lamellae that undulate as they cross the radials. The margin of the shell is very crenulated. The external coloration varies in the species across its distribution (brown, grey and purple) and the apex has a bronze coloration. The interior part of the shell is iridescent bluish grey with dark lines, corresponding to external colour patterns bordered by a white / grey halo.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810AFFC530CDFA790E2CFE87.taxon	description	External anatomy: The ventral area of the foot is black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternate series of three white shorter and a white longer one and are absent of pigmentation (Fig. 11 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 11 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, of medium length and sharp pointed, with two cusps. The second laterals are broader, wider spaced with four short cusps (Fig. 11 H).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810AFFC530CDFA790E2CFE87.taxon	distribution	Distribution: Kerguelen and Heard Islands (Fig. 11 I). Habitat: This species occurs from high and medium intertidal rocky shores down to 30 - m depths; the species is also regularly found on macroalgae (Powell, 1955, 1957)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810AFFC530CDFA790E2CFE87.taxon	discussion	Comments: In the original description of the radula from Kerguelen Islands individuals (under the name Patella fuegiensis) Smith (1879) describes: Teeth of the lingual ribbon slightly hooked, in pairs, scarcely diverging; the central pairs twopronged, the inner prong much the larger, spearhead shaped; the lateral pairs alternating with the central ones are four-pronged, the innermost prong smallest, the next two subequal, and the outside one situated nearly at right angles to the rest of the tooth, about the same size or a trifle larger. This radular teeth configuration highly resembles our observations of the radula of N. edgari. At the same time, the lateral and dorsal patterns of shell morphology recorded in Patella fuegiensis from Kerguelen by Smith (1879) are very similar to those observed in N. edgari. Accordingly, individuals identified as Nacella fuegiensis from Kerguelen should be treated as N. edgari. Powell (1957) commented that the adults of N. edgari have a very thin and fragile shell, and live closely associated to ‘ kelps’. Recent multi-locus reconstructions indicate that N. edgari from the Kerguelen Islands and N. cf macquariensis from Heard Island (González-Wevar et al., 2010) represent the same evolutionary unit (González- Wevar et al., 2017). Moreover, Nacella individuals from Macquarie Island fell within a different and endemic lineage, N. macquariensis, closely related to N. edgari (Kerguelen and Heard Islands) and to N. terroris (Campbell Island). Therefore, the colonization of both sub-Antarctic Australia / New Zealand islands, Macquarie and Campbell, constitutes a recent off-shoot from a geographically distant Kerguelenian Nacella lineage. Accordingly, N. edgari is currently restricted to Kerguelen and Heard Islands where, it coexists with N. kerguelenensis.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810FFFC5301BFE6B0F5EF97A.taxon	materials_examined	Material studied: For this revision we only had access to tissue samples obtained from ten individuals collected at Garden Cove (54 ° 29 ’ 59.15 ’’ S, 158 ° 56 ’ 09.38 ’’ E), Macquarie Island. Shell: According to Powell (1973), the shell of this species is moderately large, up to 63 mm in length, strong but of light build. Its shape is narrowly ovate and elevated but varying to rather broadly ovate and depressed. The sculpture consists of 32 to 35 broadly rounded, primary radial ribs, plus narrower secondary intermediate radials, mostly over the posterior half of the shell. The whole surface is crowded with low concentric growth lamellae that do not thicken to any extent on the crest of the radials. The external colour is olive to chestnut-brown; internally, it is diffused and strongly rayed in bronzy reddish brown, the spatula being well-marked, variously blotched with reddish brown, and often almost completely white-callused.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810FFFC5301BFE6B0F5EF97A.taxon	distribution	Distribution: Macquarie Island. Habitat: This species occurs from the high and medium intertidal rocky ecosystem down to 25 m.	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810FFFC5301BFE6B0F5EF97A.taxon	discussion	Comments: Multi-locus mtDNA and nucDNA reconstructions indicate that Nacella macquariensis from Macquarie Island represents a separate, diagnosable taxonomic unit, closely related to N. edgari (Kerguelen and Heard Islands) and N. terroris (Campbell Island). Accordingly, the distribution of N. macquariensis is restricted to the Macquarie Islands and the species is not present at Kerguelen and Heard (contra Powell, 1973).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810FFFCB30F6F91308B8F98F.taxon	description	(FIG. 12)	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
C55987A1810FFFCB30F6F91308B8F98F.taxon	materials_examined	Material studied: Perseverance Harbour, Campbell Island (52 ° 33 ’ 02.14 ’’ S, 169 ° 09 ’ 08.38 ’’ E) N = 3. Shell: The shell shape and sculpture are constant in the three analysed specimens (Fig. 12 A – C). The species exhibits a conical morphology, dorsally raised, with a very thick and non-translucent shell (Fig. 12 A – F). The anterior part of the animal is laterally compressed (Fig. 12 D – F). The shell is of medium size (maximum length 80 mm) and exhibits a high profile. The apex is situated at the anterior 40 % of the shell. All the slopes are convex (Fig. 12 A – C). The aperture is oval. The surface of the shell is sculptured with raised angular primary radial ribs, weaker secondary ones and concentric growth lines that are visible in the interspaces. The margin of the shell is crenulated. The external coloration is pale reddish-brown and grey. The primary and secondary ribs are red-brown to ash-coloured to dark brown with clearer interspaces. The internal part of the shell has a soft metallic-brown coloration with dark lines corresponding to external colour patterns, bordered by a white / brown halo. External anatomy: The ventral area of the foot is grey and the epipodial fringe is quite recognizable. The mantle fold is thin and dun-brown coloured. The mantle tentacles are not pigmented and in alternate series of three white and a white longer one (Fig. 12 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 12 G). Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and sharp pointed, with two long cusps. The second laterals are broader, wider spaced with three short cusps (Fig. 12 H). Distribution: Campbell Island, sub-Antarctic New Zealand (Fig. 12 I). Habitat: Low intertidal and subtidal rocky ecosystem down to 30 m. Comments: Multi-locus phylogenetic reconstructions recognized N. terroris from Campbell Island as a distinct taxonomic unit, closely related to Macquarie Island’s N. macquariensis and to N. edgari from Kerguelen and Heard Islands. Phylogenetic relationships and divergence time estimates indicate that Nacella species from New Zealand (N. terroris) and Australia (N. macquariensis) constitute a recent offshoot from the Kerguelen Archipelago (González- Wevar et al., 2017). MOLECULAR ANALYSES As previously demonstrated (Nakano & Ozawa, 2004, 2007; González-Wevar et al., 2010, 2017), the monophyly of Nacellidae (Nacella + Cellana), as well as the molecular distinction and the sister relationship between Nacella and Cellana, were highly supported (Fig. 13). Within Nacella, no topological inconsistencies were detected when comparing mitochondrial and nuclear markers. Phylogenetic reconstructions recognized the division of Nacella into two main clades. The first (I) includes South American lineages, while the second (II), those from maritime Antarctica and sub- Antarctic islands (Fig. 13). In South America, main clade I includes individuals of the new Magellanic lineage (a) N. yaghana sp. nov. (Fig. 13). All the analysed specimens from Pía and Garibaldi Fjords, Beagle Channel, fell within a clearly resolved, reciprocal monophyletic clade and, therefore, represent a new previously unrecognized Nacella species here described (Fig. 13). Lineage (b) includes all the individuals of N. clypeater collected along Central Chile in the Pacific margin of South America between 42 ° S and 30 ° S (Fig. 13). Finally, lineage (c) represents the most diverse South American group and includes Magellanic species: N. deaurata, N. flammea, N. magellanica and N. mytilina. As observed in previous studies (González-Wevar et al., 2010), mitochondrial DNA reconstructions recognized the reciprocal monophyly of N. mytilina and N. flammea, but failed to recover that between N. deaurata and N. magellanica. However, 28 S rRNA and the concatenated analyses (Fig. 13) recovered the reciprocal monophyly of all four Magellanic species with strong support. Accordingly, the current diversity of Nacella in South America includes three lineages (a – c) and six species (N. clypeater, N. deaurata, N. flammea, N. magellanica, N. mytilina and N. yaghana sp. nov.). The second main clade II includes Nacella species from sub-Antarctic islands and from maritime Antarctica (Fig. 13). Lineage (d) includes the species N. edgari (Kerguelen and Heard Islands), N. macquariensis (Macquarie Island) and N. terroris (Campbell Island). All the methods and molecular markers recognized N. edgari as a monophyletic unit, including individuals previously labelled N. cf. macquariensis from Heard Island (González-Wevar et al., 2010) (Fig. 13). At the same time, the species N. macquariensis (Macquarie Island) and N. terroris (Campbell Island) are both monophyletic and form a clade closely related to N. edgari (Fig. 13). Lineage (e) includes individuals of N. kerguelenensis (Kerguelen and Heard Islands), but this species was not found at Macquarie Island as reported by Powell (1973). Interestingly, high levels of genetic divergence characterize the sympatric species N. kerguelenensis and N. edgari. In fact, molecular divergence between these sympatric species are similar to those recorded between Antarctic and sub-Antarctic lineages of the genus (González-Wevar et al., 2012 b, 2016 b). Finally, lineage (f) includes the Antarctic limpet N. concinna and its sister species N. delesserti from the sub-Antarctic Marion and Crozet Islands (Fig. 13). Accordingly, the diversification of Nacella in the Kerguelen Plateau and New Zealand Islands includes two main lineages (d and e) and four species (N. edgari, N. kerguelenensis, N. macquariensis and N. terroris) while maritime Antarctica encompasses a single lineage (f) with two sister species (N. concinna and N. delesserti).	en	González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish, Poulin, Elie (2019): Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America. Zoological Journal of the Linnean Society 186: 303-336, DOI: 10.1093/zoolinnean/zly067
