Belyaevicrinus latipinnulus Mironov & Sorokina 1998

• Main Author: Roux, Michel
• Format: Other/Unknown Material
• Language: unknown
• Published: 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Crinoidea; Hyocrinida; Hyocrinidae; Belyaevicrinus; Belyaevicrinus latipinnulus; Drake Passage; South Orkney Islands; Hess; Sorokina; Tierra del Fuego
• Online Access: https://zenodo.org/record/6095267; https://doi.org/10.5281/zenodo.6095267

Belyaevicrinus latipinnulus Mironov & Sorokina, 1998 Figures 1–3, Tables 2–4. Synonymy: Belyaevicrinus latipinnulus Mironov & Sorokina, 1998: 58 –61, fig. 23, pl. 9 (figs. 2–6) and 11 (fig. 3); Roux et al., 2002: 822; Roux & Lambert, 2011: 48, fig. 33–34; Hess, 2011: T 174, fig. 85 - 2; Eléaume et al., 2014 a: 210–211. Material examined. USNM 1005436, off Chile, Drake Passage, S of Tierra del Fuego, 56 ° 57 ’S to 56 ° 56 ’S – 74 ° 54 ’W to 74 ° 43 ’W, depth 4209 m (1 specimen consisting of fragmented proximal crown and stalk). USNM 1005453 (2 dissociated specimens [B & C] consisting of basal rings, radials, columnals, brachials), South Orkney Islands, Scotia Ridge, 62 °09’ to 62 ° 16 ’S – 38 ° 11 ’ to 38 ° 24 ’W, depth 3056–3459 m. Emended diagnosis. Number of pinnules on each arm side> 10 in largest specimens; genital expansion wide with two rows of lateral plates on one side; cover plates with long and narrow projection. Pinnule socket large and close to distal margin of brachial. Brachial synostoses flat. Tegmen with interradial fields wide but not equal in their height; oral cone as tall as or taller than anal cone. Stalk symplexies with 7–8 crenular units of 1–3 crenulae, sometimes irregular and with hieroglyphic shape, especially in proxistele. Distal stalk syzygies with thin and irregular multiradiate crenularium. Description. Measurements are given in Tables 2–4. USNM 1005436 (Figs 1–2): Aboral cup height 11.9 mm; upper diameter at distal edge of radials 9.25 mm; basal ring height 5.8 mm; aboral edge of basal ring slightly flanged. About 5–6 large and convex tegminal plates per interradius; hydropores at top of small tubercles; orals 5, about half the height of the tegmen, sharp and concave (Fig. 1 A); oral cone taller than anal cone; anal cone rounded, well-differentiated, and located peripherally on tegmen (Fig. 1 B). Proximal arm pattern 1 + 2 3 + 4 5 + 6 (Fig. 1 A), with first pinnule on Br 6 (5 cases) (Fig. 1 C); longest preserved arm pattern distally with 7 + 8 + 9 10 + 11 + 12 ...