taxonID	type	description	language	source
B815878EFFEBFFE2FC75237B2FB5C4C7.taxon	materials_examined	Type species: Fissarcturus emarginatus Brandt, 1990.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFE8FFE6FF1E254C280FC58E.taxon	description	(FIGS 1 – 10) Material examined: holotype, male (9 mm), station ANDEEP 133 - 3 - E, 65 ° 20.17 ′ − 20.08 ′ S, 54 ° 14.30 ′ − 34 ′ W, 1121 m, north-western Weddell Sea, 7 February 2002, RV Polarstern (ZMH K− 40890). Paratype: female (7.8 mm), station ANDEEP 133 - 3, station data as holotype (ZMH K- 40891); male (9 mm), station ANDEEP 41 - 3 - E, 59 ° 22.24 ′ − 22.57 ′ S, 60 ° 04.06 ′ − 34 ′ W, 1121 m, off Elephant Island, 26 January 2002, RV Polarstern (ZMH K- 40892); 5 manca I stages, station ANDEEP 46 - 7 - E, 60 ° 38.33 ′ − 06 ′ S, 53 ° 57.38 ′ − 51 ′ W, 3894 m, 30 January 2002, RV Polarstern (ZMH K- 40893). Distribution: South Shetland Islands, Weddell Sea, Southern Ocean. Etymology: The species name is derived from Latin bathy-, which means ‘ deep’ and refers to the depth and location of the type locality in the Weddell Sea. The gender is masculine. Diagnosis: Dorsal pereonal spination with elements in submedial, dorsolateral, lateral and coxal rows, dorsal spines smooth, anterior ones long, prominent, spines on posterior pereonites and on pleotelson shorter, blunt. Proximal last lateral pair of spines inserted almost at caudal tip, at 98 % of the pleotelson length. Minute pleotelsonic apex. Description of the holotype male: Body length 9 mm (Fig. 1). Eye large, oval. Eye 0.4 of lateral length of head. Preocular spine long, acuminating, blunt, almost as long as supraocular spine. Supraocular spine blunt, long, directed frontally, slightly more than twice as long as diameter of eye. Second cephalic spine broken off in male. Two lateral smaller spines on head in male. Body long, slender (Fig. 1), pereonites 1 – 4 of about same length, pereonites 1 – 3 widest. Pereonite 4 about as wide as pereonites 5 – 7. All pleonites fused with pleotelson. Pereonal spination comprising elements in submedial, dorsolateral, lateral and coxal rows. Submedial and dorsolateral spines present on pereonites 1 – 4, submedial spines on pereonites 5 – 7 similar to 1 – 4, but smaller than on 1 – 4. Submedial, dorsolateral and lateral spines present on pereonites 1 – 7, longer and more stout on pereonites 1 – 4, on pereonite 4 shorter than on 3, blunt, small and tubercularlike on 5 – 7. Coxa 1 with 3 – 4 marginal spines (sexually dimorphic). Four contiguous coxal spines present on pereonite 1, frontally directed. One spine on coxae 2 – 7 each, longest on pereonites 2 and 3, in male tubercular-like. Ornamentation of coxae of pereonites 1 – 7 with tubercles, some spine-like. Six major submedial and sublateral spines on pleotelson and 4 – 5 lateral, last caudolateral one very prominent. Pleotelson length 0.25 – 0.3 times total body length. Pleotelson width 0.5 total pleotelson length. Position of most posterior lateral spines 98 % of pleotelson length. Position of last lateral pair of spines on pleotelson apically. Pleotelson apex minute, convex. A 1 (Fig. 2) first peduncular article broadest and shorter than second, first and second both with medial and lateral feather-like setae, more laterally. Peduncular article 3 0.4 times length of article 2. Antenna 1 flagellum, aesthetascs seven groups of two, terminal simple setae and one short feather-like one. A 2 (Fig. 2) peduncle 0.58 body length, with strong lateral spines on articles 2 – 4. Peduncular articles 3 – 5 with lateral and medial short spinules. Antenna 2 flagellum broken off in male. Mandibles (Fig. 2) without palp, asymmetrical. Pars incisiva of lMd with three teeth. Mx 1 (Fig. 2) of two endites, both slightly narrowing distally, lateral one distally curved medially, apex with 11 strong smooth spines. Medial endite shorter, but lost during dissection. Mx 2 (Fig. 2) consisting of three endites. Outer, lateral, endite with three long setulated setae, medial endite also with three setulated setae, inner endite with two rows of nine shorter setulated setae. Mxp (Fig. 2) with long-oval epipod, strong endite and a five-segmented palp. Endite distodorsally with four spine-like setulated setae. One coupling hook in male. Third palpal article longest, first and last smallest, dense medial brush of long setae equipped with few setules, especially on third to fifth articles. P 1 (Fig. 3) basis slightly shorter than propodus, carpus trapezoidal, propodus subchelate and slender. Pereopod 1 propodus, length 0.5 times width. Dactylus shorter than propodus, with one long, strong distal claw. Propodus and dactylus densely setose. Ventral surface of propodus with few setae, most on medial part and on palm. Mediodorsal side of propodus forming a concave ‘ spoon’, curved dorsolateral surface with long setae, arranged in six parallel transverse rows of combs, dorsal part of palm bearing many medially directed setae. P 2 – 4 (Fig. 3) similar. P 2 shortest, P 4 longest, many long setae on posteromedial margins, some long setae on anterolateral margins, especially on carpus and propodus. Dorsal ornamentation of basis with tuberculated spines, and small blunt spines scattered on ventral side of carpus and propodus of P 3 and P 4, ischium-carpus of P 2 – P 4 dorsal margin with tuberculated spines. Eight, seven, eight setal groups on carpus. Seven, five, four setal groups on propodus. Pereopods 2 – 3 dactylus, length 0.5 propodus. Unguis as long or longer than dactylus. Pereopods 2 – 3, unguis, length 1 dactyus. Pereopod 4, dactylus, length 0.5 propodus. Pereopod 4, unguis, length 0.5 dactylus. P 5 – 7 (Fig. 4) similar in shape and setation and shorter and stouter than P 2 – P 4, P 7 smallest. Basis of P 5 and P 6 longest article, of P 7 propodus longest. Basis with 1 – 2 feather-like setae. Merus, carpus and propodus with ventral strong setulated sensory setae, and some additional ventrolateral ones. Propodus dorsally with one feather-like seta and several simple setae. Dactyli all broken off in holotype. Plp 1 (Fig. 4) sympod 0.4 as long as rami, with seven coupling setae. Exopod length 0.9 length and 1 width of endopod. Male pleopod 1 exopod terminally and medially equipped with setae. Male pleopod 1 endopod, groove opening at 80 % of length, and groove opening with row of small scales. Endopod with eight distal and 20 lateral setae. Plp 2 (Fig. 4) very similar to Plp 1, but with much shorter sympod, about 0.2 as long as rami, without lateral spines, but with three medial coupling setae. Appendix masculina 1.2 length of endopod, simple. Plp 3 (not illustrated) with very short sympod, as following pleopods; exopod with shorter lateral plumose setae, endopod bare. Plps 4 and 5 (Fig. 5) exopod with two and one plumose seta, respectively. Urp (Fig. 5) endopod 0.7 length of exopod. Uropod endopod with three distal setae. Female paratype (differences to holotype male) of 7.8 mm length: Preocular spines acute (Figs 6, 7). Second cephalic spine, longer and more robust than supraocular spine, acute in female, three other spines on head. Pereonites, pleonites and pleotelson of female with very similar pattern of spination if compared with male, but spines are generally slightly longer and more acute. Four erect coxal spines on pereonite 1. Antennula (Fig. 8) with two pairs of aesthetascs and fewer feather-like setae on lateral and medial margins. Antenna (Fig. 8), fifth article with few tubercles, flagellum of five articles. Maxilliped (Fig. 8) with long, distally acuminating epipod, strong endite and a fivesegmented palp. Endite distodorsally with seven spine-like setulated setae, medially with another three setae, no coupling hooks present. Medial brush of long setae equipped with few setules more dense than in male, especially on third to fifth articles. Pereopods (Figs 9, 10) all very similar, but ischium, merus and carpus of female with distal, blunt, spine-like projections. Endopodite of uropod (Fig. 10) with three setae. Remarks: F. bathyweddellensis can easily be distinguished from other species of the genus by the spination on the dorsum of the body. It is similar to F. emarginatus Brandt, 1990, but has a longer and stouter second cephalic spine. In addition, its pereonal spination comprises elements in submedial, dorsolateral, lateral and coxal rows, whereas that of F. emarginatus only has submedial, dorsolateral and coxal rows. In contrast to the long and acute spines of F. emarginatus on the posterior pereonites and pleonites, those of F. bathyweddellensis are shorter, blunt and more tubercle-like on these body segments.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	materials_examined	Material examined: Holotype, male (8.2 mm), Station ANDEEP 143 - 3, 65 ° 18.55 ′ S, 51 ° 31.95 ′ W, 2893 − 2894 m, South Sandwich Islands, 6 March 2002, RV Polarstern (ZMH K- 40894). Paratypes: Female (9 mm – illustrated), station ANDEEP 143 - 3, same locality as holotype, RV Polarstern (ZMH K- 40895); further paratype material from the same station: male (juveniles 7, 7.5, adult 10 mm), female (2 ovig: 8 mm), Manca (2.8, 3, 3, 3.8, 4, 4.8, 5, 5.2, 5.2 mm), juveniles (6.3, 6.5, 7 mm).	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	distribution	Distribution: Southern Ocean, South Sandwich Islands.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	etymology	Etymology: The species name is derived from the name of the type locality, the South Sandwich Islands. The gender is masculine.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	diagnosis	Diagnosis: Strong frontally bent supraocular spines (females with second cephalic spines) and dorsum covered with flat, cauliflower-like elevations in submedial, lateral and coxal rows.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	description	Description of the holotype male: Body (Fig. 11) length 8.2 mm. Eye rounded. Eye 0.2 of lateral length of head. Preocular spine absent. Supraocular spine long, blunt, strongly curved frontally. Second cephalic spine shorter than supraocular spine, boss-like, with spinules or tubercles. Second cephalic spine hemispherical bosses. Other spines on head absent. Body long, slender (Fig. 11). Pereonites 1 – 3 of about same length, pereonite 4 longest, anterior pereonites of about same width. Pereonites 5 – 7 slightly narrowing in width. Pereonal spination comprising elements in submedial, dorsolateral and coxal rows. Submedial spines present on pereonites 1 – 4, dorsolateral spines present on pereonites 1 – 3. Submedial spines present on pereonites 5 – 7 absent in male. Spines present on 1 – 7, of cauliflower shape (except for supraocular ones), two pairs on pereonites 1 – 3. Dorsolateral spines present on 1 – 3, of cauliflower shape. Three or four contiguous marginal spines on coxa 1, frontally directed, pereonites 5 – 7 only with tubercles in both sexes. Intermediate ornamentation on pereonites absent. All pleonites fused with pleotelson. No submedial spines on pleotelson. Position of lateral spines on pleotelson at half length. Pleotelson length 0.35 body length. Pleotelson width 0.3 total pleotelson length. Pleon spination, male only with small scattered tubercles. Position of most posterior lateral spines 55 % of pleotelson length in male. Pleotelson apex prominent, triangular, caudally rounded. A 1 (Fig. 12) first peduncular article broadest and shorter than second, first and second both with medial feather-like setae. Peduncular article 3 0.4 length of article 2. Antenna 1 flagellum, one proximal single, six groups of two and three apical ones in male. A 2 (Fig. 12) peduncle 0.8 body length. Antenna 2 peduncle scattered tubercles on articles 2 – 4 female. Antenna 2 flagellum with five articles. Mandibles (Fig. 12) without palp, asymmetrical. Pars incisiva and lacinia mobilis of lMd with three teeth. Mx 1 (Fig. 12) of two endites, both slightly narrowing distally, lateral one distally curved medially, apex with 11 strong smooth spines. Medial endite shorter, with three stout setulated setae. Mx 2 (Fig. 12) consisting of three endites. Outer, lateral, endite with three long setulated setae, medial endite also with three setulated setae, inner endite with a rows of eight shorter setulated setae. Mxp (Fig. 12) with long, oval epipod slightly waisted laterally in distal third, rounded endite and a five-segmented palp. Endite distodorsally with six spine-like setae, one being setulated. No coupling hooks. Third palpal article longest, slightly longer than fourth, first and last smallest, dense medial brush of long sensory setae, especially on third to fifth articles. P 1 (Fig. 13) basis about as long as propodus, carpus trapezoidal, propodus subchelate and slender. Pereopod 1 propodus, length 1 – 1.4 of total width. Dactylus shorter than propodus, with one long, strong distal claw. Propodus and dactylus densely setose. Ventral surface of propodus with few setae, most on medial part and on palm. Mediodorsal side of propodus forming a concave ‘ spoon’, curved dorsolateral surface with long setae, arranged in five parallel transverse rows of combs, dorsal part of palm bearing many medially directed sensory setae. P 2 – 4 (Figs 13, 14) similar, P 2 shortest, P 4 longest. Eight, 8, 7 – 9 setal groups on carpus of pereopods 2 – 4, and 6 – 8, 6 – 7, 5 – 6 setal groups on propodus of pereopods 2 – 4. Dorsal ornamentation of basis tubercles and denticulate spines in males. Pereopods 2 – 4, ornamentation on ischium-carpus tubercles in male only on pereopod 4. Pereopods 2 – 3 dactylus, length 0.4 – 0.5 length of propodus. Unguis as long or longer than dactylus. Pereopods 2 – 3 unguis, length 1.2 – 1.3 that of dactyus. Pereopod 4, dactylus, length 0.4 – 0.5 that of propodus, and 0.7 – 1 length of dactylus. Pereopod 4 dactylus of male without setae. P 5 – 7 (Figs 13, 14) similar in shape and setation and shorter and stouter than P 2 – P 4. Pereopods 5 – 7 progressively shorter, with tubercles on basis. Basis of P 5 – P 7 longest article. Basis of P 6 and P 7 with one feather-like seta. Merus, carpus and propodus with ventral strong setulated setae. Propodus dorsally with one feather-like seta and some simple setae of varying lengths. Dactyli with two short claws, dorsal one much longer than ventral one. Plp 1 (Fig. 15) sympod 0.8 as long as rami, with four coupling setae. Male pleopod 1 exopod length 1 endopod. Male pleopod 1 exopod 1 width of endpod. Male pleopod 1 exopod terminally and medially equipped with setae. Male pleopod 1 endopod, groove opening 60 % of length, and groove opening with row of small scales and four stout small setae on proximal lobe. Male pleopod 1 endopod with 19 distal and nine lateral setae. Plp 2 (Fig. 15) very similar to Plp 1, but with much shorter sympod, about 0.3 as long as rami, with three medial coupling setae. Appendix masculina 1.1 length of endopod, acute, small denticles on distal part. Plp 3 (Fig. 14) with very short sympod (0.1 length of endopod and exopod), as following pleopods; endopod with four medial and three lateral plumose setae, exopod bare. Plp 4 (Fig. 14) endopod with two plumose setae. Urp (Fig. 14) endopod 0.6 length of exopod. Uropod endopod with two distal setae. Female paratype (Figs 16 – 19) (differences to holotype male) of 9 mm length: Dorsolateral spines present on 1 – 3, of cauliflower shape; female with long spines on pereonite 1, almost as long as supraocular ones, frontally curved (Fig. 16). Pereonites, pleonites and pleotelson of female with very similar pattern of spination if compared with male, but cauliflower-like spines are generally slightly more pronounced. Four erect marginal coxal spines present on pereonite 1. Margins of coxae 2 and 3 with anteriorly and posteriorly directed spines in female only. No coxal spine on pereonite 1 of either sex; one spine on coxa 2 of female, coxae 3 – 4 with cauliflower-like elevations on female, 5 – 7 only with tubercles in both sexes. Pleon spination of female with submedial and lateral cauliflower-like setae. Position of most posterior lateral spines 70 % of pleotelson length in female. Antennular flagellum of female broken off. Antennal flagellum (Fig. 17) of four articles. Maxilliped (Fig. 17) with long, oval epipod, endite with six spine-like setulated setae, medially with another five simple setae, no coupling hooks present. Pereopods 2 – 4 (Fig. 18) and 5 – 7 (Fig. 19), ornamentation with tubercles and denticulate spines in both sexes, but more prominent in female. On ischium-carpus tubercles on pereopods 2 – 4 in female. Marginal setae of P 2 – 3 dactylus in female only. Pereopod 4 dactylus with few setae in female, none in male. Pleopod 2 (Fig. 20) without appendix masculina. Endopodite of uropod (Fig. 20) with three setae.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFECFFF7FC8625B42C7AC2C9.taxon	discussion	Remarks: F. sandwichi can easily be distinguished from all other species of Fissarcturus by its typical ornamentation of the dorsum. It is characterized by a strongly frontally bent supraocular spine, equipped with some tubercular-like pegs (females with another second pair of cephalic spines which are only slightly shorter). All other species of Fissarcturus possess more spines on additional pereonites, except for F. patagonicus (Ohlin, 1901) and F. granulosus (Nordenstam, 1933), which are characterized by minute supraocular spines. Moreover, the dorsum of F. sandwichi is covered with flat, cauliflower-like elevations in submedial, lateral and coxal rows, which are not present in this form in any other species of Fissarcturus.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
B815878EFFFDFFFBFF62237D292EC4E7.taxon	materials_examined	Material examined: Holotype, female (10.5 mm), station, 74 ° 20 ′ S, 179 ° 55 ′ W, 205 – 220 m, Pennell Bank, Ross Sea, 8 February 1960, New Zealand Oceanographic NIWA 3926. Distribution: Only known from type locality. Etymology: The species name is derived from the name of the type locality, the Ross Sea. The gender is masculine. Diagnosis: Pereonal spination comprising elements in submedial, dorsolateral, lateral and coxal rows, spines of F. rossi are covered with spinules; most posterior lateral spines are positioned 100 % at the caudal tip, and the pleotelson apex straight, not extended caudally. Description of the holotype male: Body length 10.5 mm. Eye rounded, 0.3 times lateral length of head. Preocular spine present, small, acute. Supraocular spine long, twice as long as diameter of eye, denticulated. Second cephalic spine slightly longer than supraocular spine, denticulated. Other spines on head, six additional ones on caudal margin. Body long, slender (Fig. 21), except for the anterior pereonites, which are laterally slightly widened. Pereonites 1 – 4 of about same length, pereonites 1 – 4 widest. Pereonite 3 widest, pereonites 5 – 7 slightly acuminating. Pereonal spination comprising elements in submedial, dorsolateral, lateral and coxal rows. Submedial and dorsolateral spines present on pereonites 1 – 4. Submedial spines also present on pereonites 5 – 7 similar to 1 – 4, all long, denticulate, longest in pereonite 3, then slightly decreasing in length from 4 to 7, two pairs present on pereonites 2 – 4. Two pairs of long, denticulate dorsolateral spines present on pereonites 1 – 7, but lightly shorter than submedial ones, present on segments, longest on pereonite 3, then slightly decreasing in length from 4 to 7. Lateral spines present on pereonites 1 – 7, all much shorter and smaller than dorsolateral ones, denticulate, three pairs present on pereonites 5 – 6, two pairs on 7. Coxal spines present on 1 – 7, all long, denticulate, four on pereonite 1, erect in the female, longest on pereonite 3, then slightly decreasing in length from 4 to 7. Intermediate ornamentation with small denticulate spines at lateral margin and between large submedial, dorsolateral and lateral spines. All pleonites fused with pleotelson. Position of lateral spines on pleotelson apically. Pleotelson length 0.35 of body length, width 0.38 total pleotelson length. Pleon spination seven submedial, six sublateral and 6 – 7 lateral denticulated spines. Position of most posterior lateral spines caudolaterally, 100 % at caudal tip. Pleotelson apex straight, not extended caudally. A 2 (Fig. 22) Antenna 2 peduncle 0.4 body length, with small denticulate spines scattered over entire articles. Antenna 2 flagellum with three articles. P 1 (Fig. 23) basis longer than propodus, carpus trapezoidal, propodus subchelate and slender. Pereopod 1 propodus, length 2.3 width. Pereopod 1 propodus with six oblique rows of setulated setae on mesial face. Dactylus only slightly shorter than propodus, with one long and one short distal claw. Propodus and dactylus densely setose. Ventral surface of propodus with few setae, most on medial part and on palm. P 2 – 4 (Fig. 22) similar. P 2 shortest, P 4 longest, many long setae on posteromedial margins, some long setae on anterolateral margins, especially on carpus and propodus. Eight, eight, nine setal groups on carpus of pereopods 2 – 4. Six, six, four setal groups on propodus. Several long and stout denticulated spines on basis of pereopods 2 – 4. Ornamentation of ischium-carpus of pereopods 2 – 4 with short denticulated spines and a long, stout distodorsal denticulated spine. Pereopods 2 – 3 dactylus length 0.4 that of propodus. Unguis as long as or longer than dactylus. Pereopods 2 – 3 unguis length 1.1 length of dactyus. Pereopod 4 dactylus length 0.4 that of propodus. Pereopod 4 unguis, length 1.1 that of dactylus. P 5 – 7 (P 5 in Fig. 22) progressively shorter, several long denticulate spines on basis, one on ischium, merus and carpus and small denticulate tubercles scattered over entire surface. Remarks: Only the female of F. rossi is known. F. rossi can most easily be distinguished from other Fissarcturus species by the prominent spines on the dorsum of the body which are covered with numerous small spinules. The spines of all other species are either smooth or cauliflower-shaped, but never equipped with spinules. Moreover, the pereopods of F. rossi are covered with many spinules and also with long spines on the dorsal side of the bases, which are also equipped with many acute small spinules. Such a strong spination of the pereopods has not been reported for any other species of Fissarcturus until now. F. rossi is similar to F. bathyweddellensis, but can also easily be distinguished from this species by the spine pattern. Whereas all dorsal spines of F. bathyweddellensis are smooth, those of F. rossi are covered with spinules. Moreover, the eye of F. bathyweddellensis is smaller than that of F. rossi. The last caudolateral pair of spines is inserted at 98 % of the pleotelson length in F. bathyweddellensis, showing a convex minute apex of the pleotelson in dorsal view. In F. rossi, however, the most posterior lateral spines are positioned terminally at the caudal tip, and the pleotelson apex of F. rossi is straight, and not extended caudally. The antennal flagellum of F. bathyweddellensis bears six flagellar articles, but that of F. emarginatus and F. rossi only three. The anterior pereopods of F. bathyweddellensis bear some tubercles on the ventral margin, which are absent in F. emarginatus, but more numerous in F. rossi.	en	Brandt, Angelika (2007): Three new species of Fissarcturus (Isopoda, Antarcturidae) from the Southern Ocean. Zoological Journal of the Linnean Society 149 (2): 263-290, DOI: 10.1111/j.1096-3642.2007.00247.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00247.x
