Feracrinus aculeatus Mironov and Sorokina 1998a

Ameziane, Nadia & Roux, Michel, 2010, Stalked crinoids from Tasmanian seamounts. Part 1: Hyocrinidae, Journal of Natural History 45 (3 - 4), pp. 137-170 : 140-141

Feracrinus aculeatus Mironov and Sorokina 1998a

Feracrinus aculeatus Mironov and Sorokina, 1998a: 410–414 , figs 3 and 4 (5–6).

Mironov and Sorokina, 1998b: 20, fig. 5, pl. 2 (4–6) and 19 (1–2).

Ailsacrinus peripterus Mironov and Sorokina, 1998a: 405–408 , figs 1 and 4 (2–4). Roux et al., 2002: 822.

Ailsacrinus klikushini Mironov and Sorokina, 1998a: 408–410 , figs 2 and 4 (1).

Camaecrinus peripterus Mironov and Sorokina, 1998b: 22–23 , fig. 6, pl. 3 (1–2) and 10 (3).

Camaecrinus klikushini Mironov and Sorokina,1998b: 23–24 , fig. 7.

Emended diagnosis

A species of Feracrinus with relatively wide arm bases (ratio of upper radial width to Br1 width 1.2 to 1.5). Br1 usually larger than Br2. Brachial pairs united by synostosis, and brachials with two muscular articulations showing conspicuous constriction midway between their muscular articulations; stronger in small than in large specimens. Lateral flattened projection or thorns on proximal pinnulars and brachials. Rarely, series of three brachials united by synostoses beyond Br10. Beyond Br4, first brachial with two muscular articulations usually from Br7 to Br11, mostly Br7. Proximal part of genital pinnules with H-shaped additional plates. Tegmen moderately inflated in largest specimens, number of tegminal plates per inter-radius from 10 Note: N, number of specimens.

(small specimens) to more than 20, anal cone higher than oral cone. Orals with fingerlike projections. Height of aboral cup up to 15.3 mm. Ratio of height to maximum diameter of aboral cup 1.1–1.5, ratio of cup height to radial height 1.1–1.6, ratio of upper radial ring diameter to upper basal ring diameter 1.37–1.42. Proximalmost stalk diameter up to 3.8 mm. Juvenile columnal symplexies with seven or eight crenular units of one short crenula. In larger specimens, columnal symplexies with eight crenular units of one to three hieroglyph-like crenulae; distal syzygies with labyrinthic to irregular radial pattern.

Occurrence

Northwestern Pacific, depth 2915–3275 m.