taxonID	type	description	language	source
03F5D923FFBD1A750B05FE32FE8B7E23.taxon	materials_examined	Type species Ebiscothyris bellonensis gen. et sp. nov. Diagnosis Medium-sized terebratulide; outline subpentagonal; surface smooth; anterior commissure strongly and broadly unisulcate; beak suberect; deltidial plates conjunct; foramen circular, of medium size; cardinal process distinct, semi-elliptical; crural processes blunt and directed ventrally; hinge plates narrow and triangular; loop short, with broad descending branches and broad, medially folded, transverse band. Etymology Referring to the cruise, EBISCO, during which the specimens were collected. Remarks The strongly unisulcate anterior commissure of Ebiscothyris gen. nov. differentiates it from other extant members of the Terebratulidae, which are commonly rectimarginate to weakly uniplicate. The only terebratulid genus with a similarly unisulcate anterior commissure is Kanakythyris Laurin, 1997 from around New Caledonia and the Norfolk Ridge, but Kanakythyris clearly differs from Ebiscothyris gen. nov. in beak and loop characters (Laurin, 1997; Bitner, 2009). The parallel descending branches and broad medially folded transverse bands of the Ebiscothyris gen. nov. loop resembles those of the terebratulid genera Acrobrochus Cooper, 1983, Erymnia Cooper, 1977, Tichosina Cooper, 1977, Dolichozygus Cooper, 1983, and Dysedrosia Cooper, 1983, but unlike these genera Ebiscothyris gen. nov. clearly differs in external morphology and lacks well-defined and distinctive crural bases (Cooper, 1977; Cooper, 1983). Like Ebiscothyris gen. nov., some dyscolioids are deeply unisulcate (e. g. Abyssothyris Thomson, 1927), but their loop has very narrow descending branches and an anteriorly rounded transverse band (Cooper, 1983; Laurin, 1997; Bitner, 2006; 2008; Lee, 2006), differing markedly from Ebiscothyris gen. nov., which has the broad, medially folded transverse band characteristic of Terebratulidae (Lee & Smirnova, 2006). Overall, morphology of the shell and loop lead us to allocate Ebiscothyris gen. nov. to the Terebratulidae rather than to the Dyscoliidae.	en	Bitner, Maria Aleksandra, Cohen, Bernard L. (2015): Congruence and conflict: case studies of morphotaxonomy versus rDNA gene tree phylogeny among articulate brachiopods (Brachiopoda: Rhynchonelliformea), with description of a new genus. Zoological Journal of the Linnean Society 173 (2): 486-504, DOI: 10.1111/zoj.12217, URL: http://dx.doi.org/10.1111/zoj.12217
03F5D923FFBD1A77097CFF76FEF07C06.taxon	description	(FIGS 7 A – I, 8 A – F, 9 A – D) Diagnosis As for the genus. Etymology Referring to the Bellona Plateau, where part of the material was collected. Holotype The specimen illustrated in Figure 7 E – H, IB- 2013 - 1, was collected at station CP 2616 on the Chesterfield Plateau. Paratypes The specimens illustrated in Figures 7 A – D, I and 8 A – F, IB- 2013 - 2 to IB- 2013 - 6, were collected at stations CP 2557 and CP 2616. Type locality Cruise EBISCO, station CP 2616, Coral Sea, Chesterfield Plateau, 19 ° 35.08 ′ S, 158 ° 49.83 ′ E, 786 – 836 m depth. Material examined Coral Sea, cruise EBISCO, western Bellona Plateau: station DW 2544, 21 ° 09.91 ′ S, 158 ° 38.15 ′ E, 650 – 723 m depth, five specimens; station CP 2545, 21 ° 10.04 ′ S, 158 ° 37.40 ′ E, 765 – 778 m depth, three specimens; station CP 2556, 21 ° 05.29 ′ S, 158 ° 33.72 ′ E, 741 – 791 m depth, nine specimens; station CP 2557, 21 ° 06.05 ′ S, 158 ° 31.66 ′ E, 800 – 923 m depth, three specimens. Chesterfield Plateau: station CP 2616, 19 ° 35.08 ′ S, 158 ° 49.83 ′ E, 786 – 836 m depth, 28 specimens. Depth range 650 – 923 m. Measurements (station, length, width, and thickness, all in mm) CP 2616 (holotype), 13.1, 12.0, 8.1; CP 2616 (paratype), 13.1, 12.3, 7.1. Measurements of all currently available specimens of E. bellonensis gen. et sp. nov. are given in Appendix S 7. Description Shell of medium size, white, thin to translucent anteriorly, elongate oval to subpentagonal in outline, with maximum width at about mid valve. Shell surface smooth, with weakly defined growth lines; lateral and anterior valve margins slightly incurved, thickened (Fig. 7 C, D, G, H). Shell biconvex, ventral valve more convex. Lateral commissures dorsally curved, anteri- or commissure strongly and broadly unisulcate. Beak short, suberect to erect. Foramen of medium size, circular, permesothyrid. Deltidial plates conjunct, forming a well-exposed symphytium with only a weak median line of junction in some specimens (cf. Fig. 8 A). Pedicle variable, may be as much as ten times as long as the shell (Fig. 7 I). The long pedicle differentiates E. bellonensis gen. et sp. nov. from Abyssothyris and other terebratulids. Ventral valve interior with welldeveloped tubular, excavate pedicle collar (Fig. 8 F). Teeth small, short (Fig. 8 A). Dorsal valve interior with long and medially inclined inner socket ridges that bound wide sockets; fulcral plates well developed. Cardinal process prominent, semi-elliptical (Fig. 8 D, F). Outer hinge plates narrow, triangular; crural bases ill defined. Loop short, occupying about 25 % of dorsal valve length, with blunt, short, crural processes directed ventrally (Fig. 8 B – E). Descending branches subparallel, very wide; transverse band broad, medially folded. Muscle scars strongly impressed on both valves, elongate oval in outline. Ultrastructural analysis shows three shell layers (Fig. 9 A – D). The microgranular primary layer is 5.2 – 7.8 μm thick, the secondary layer is very thin (3.2 – 5.6 μm), and its fibres are wide, implying that mantle epithelial cells are large, and / or that the angle between the fibres and the primary layer is small. In transverse section, the secondary layer shows only two overlapping layers of fibres (Fig. 9 B), a feature that has only been reported before in the dyscoliid Xenobrochus norfolkensis Bitner, 2011 (Bitner, 2011: fig. 4 E, F); however, the incurved, thickened valve margins are built of several, densely arranged sheets of secondary fibres (see Fig. 9 C). The tertiary layer of E. bellonensis gen. et sp. nov. is thick (85 – 152 μm), with its internal surface showing clear traces of large, irregularly interlocking prisms (Fig. 9 C, D). The total shell thickness is 96 – 160 μm. In Kanakythyris (Fig. 9 E, F) the shell is also composed of three layers; however, the secondary layer is much thicker, and the prisms are more irregular on the internal surface, and display delicate ornamentation (Fig. 9 F), whereas in E. bellonensis gen. et sp. nov. they are smooth (see Fig. 9 D).	en	Bitner, Maria Aleksandra, Cohen, Bernard L. (2015): Congruence and conflict: case studies of morphotaxonomy versus rDNA gene tree phylogeny among articulate brachiopods (Brachiopoda: Rhynchonelliformea), with description of a new genus. Zoological Journal of the Linnean Society 173 (2): 486-504, DOI: 10.1111/zoj.12217, URL: http://dx.doi.org/10.1111/zoj.12217
