Freyastera sexradiata (Perrier 1885)

Freyastera sexradiata (Perrier, 1885)

Freyella sexradiata Perrier, 1885c:6; 1894:89–90, pl. 3: fig. 2.—Koehler, 1906[1907]:145; 1909a:129–130, pl. 23: fig. 9; 1921:2.—Grieg, 1927a:20, fig. 10.—Mortensen, 1927:129.—Gage et al., 1983:285.—Korovchinsky and Galkin, 1984:1213 [key].

MERISTICS.—Arms = 6(5), R = 100+ mm (estimated), r = 5–8 mm, R/r = 12.5–17/1, length of gonadal region = 30 mm, length of longest arm spine = 3 mm.

DIAGNOSIS.—[80.b] Size of madreporite moderate; [100.d] madreporite oval, with single S-shaped pore; [110.e] abactinal disc plates scale-like; [130.a] abactinal disc plates each bearing 1(2) glassy aciculate spinelet; [205.a] gonadal region of arm slightly inflated; [210.e] abactinal arm plates scale-like; [240.a] abactinal arm plates bearing single glassy spinelet; [280.a] marginal plates small; [290.c] form of marginals a small tubercle; [300.b] marginals occurring about every third adambulacral; [310.a] marginals each bearing a moderate-sized spine; [330.a] adambulacral plates cylindrical; [390.b] subambulacral spines moderately long, frequently capitate, spine on actinal face of adambulacral, plus a tiny secondary spine near distal prolongation of adambulacral; [420.a] ambulacral plates large, heavy; [430.d] head of ambulacral plates elongate; [470.a] tubefeet rather delicate; [480.c] mouth plates large; [490.d] mouth plates slightly longer than broad; [500] number of preoral spines per mouth plate 3 or 4; [530] number of lateral oral spines per mouth plate 1 or 2, tiny; [540.a] lateral oral spines acute; [550.c] one lateral oral spine on distal lateral prolongation of mouth plate; [560] number of suboral spines per mouth plate 1, moderately large; [580.b] suboral spines below center of mouth plate; [620.f] pedicellariae occurring only on spines, fewer than normal in most Brisingida; [630.a] all pedicellariae small.

COLOR.—Unknown.

TYPE.—Paris Museum 4598 (holotype); Talisman Sta 134, 42°19′N, 23°36′W, 4060 m.

MATERIAL EXAMINED.—Holotype.

DISTRIBUTION.—Azores, Portugal, Bay of Biscay, 38° to 45°N, 9° to 23°W; 4020–4700 m.