Austrotindaria svalbardensis Foster & Danise & Twitchett 2017, sp. nov.

• Main Authors: Foster, William J., Danise, Silvia, Twitchett, Richard J.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Nuculanida; Neilonellidae; Austrotindaria; Austrotindaria svalbardensis; Svalbard
• Online Access: https://doi.org/10.5281/zenodo.10903517; http://treatment.plazi.org/id/C53B0B4D805AE8206C03FB998CB42315

Austrotindaria svalbardensis sp. nov. (Fig. 6) 1864 Anoplophora fassaensis (Wissmann); Alberti: 137, pl. 3, fig. 8. 1930 Nucula sp. juv. ind; Spath: 53, pl. 7, fig. 12. 2013a Unionites fassaensis (Wissmann); Hofmann et al .: 887, fig. 8, 17–18. 2015 Unionites cf. fassaensis Hautmann et al. : 890, fig. 10H. Diagnosis. Shell small, smooth except for concentric growth lines, subtrigonal, inequilateral, orthogyrate; taxodont hinge dentition with more posterior than anterior teeth, obtusely chevron-shaped teeth, hinge plate interrupted below the beak by an edentulous gap, a small rounded triangular pit below the edentulous gap; ligament opisthodetic. Holotype. Disarticulated right valve, NHMUK PI MB 1223, LD-04; length = 1.8 mm, height = 1.3 mm. Paratype. Disarticulated left valve, NHMUK PI MB 1231, LD-04; length = 1.5 mm, height = 1.0 mm. Other material. Twenty-one specimens from LD-04 (NHMUK PI MB 1190; NHMUK PI MB 1192–1193; NHMUK PI MB 1224–1230; NHMUK PI MB 1232– 1233; NHMUK PI MB 1235–1236; NHMUK PE PEI 5478; NHMUK PE PEI 5482; NHMUK PE PEI 5489; NHMUK PE PEI 5505; NHMUK PE PEI 5509–5510; NHMUK PE PEI 5512; NHMUK PE PEI 5520) and 12 specimens from LD-05 (NHMUK PI MB 1189; NHMUK PI MB 1197; NHMUK PI MB 1200; NHMUK PE PEI 5476; NHMUK PE PEI 5491–5492; NHMUK PE PEI 5496; NHMUK PE PEI 5498; NHMUK PE PEI 5503– 5504; NHMUK PE PEI 5517). Twenty-four prodissoconch valves from LD-04 (NHMUK PI MB 1234; NHMUK PI MB 1237; NHMUK PI MB 1238; NHMUK PE PEI 5520) and five prodissoconch valves from LD-05 (NHMUK PI MB 1239). Derivation of name. Named after the Svalbard archipelago. Description. Shell outline subtrigonal, equivalve, inequilateral with beak positioned approximately 60% of the distance along the dorsal margin from the posterior; Height/Length (H/L) ratio 0.6–1; conspicuously tumid. Orthogyrate umbo, prominent, moderately broad, rounded and projected above the hinge margin. Anterodorsal margin slightly rounded and gently sloping. The posterodorsal margin is almost straight to slightly rounded and gently sloping. ...