Brisingenes multicostata (Verrill 1894)

Brisingenes multicostata (Verrill, 1894)

Brisinga multicostata Verrill, 1894:280.

Brisingenes multicostata.—Fisher, 1917:426; 1919:513.

MERISTICS.—Arms = 13–15, R = ∼170–400 mm, r = 13–16 mm, R/r = 13–25/1, length of gonadal region = 52–80 mm, length of longest arm spine = 5–13 mm.

DIAGNOSIS.—[80.a] Madreporite large, raised well above plane of arms; [100.b] madreporite warty, irregular; [110.a] abactinal disc plates round, metapaxillar; [120.b] abactinal disc plates dense in membrane; [130.a] abactinal disc plates bearing 1 or 2 small glassy acicular spinelets; [170] number of arms 13–15; [205.a] gonadal region of arms 52–80 mm long, inflated; [210.a] abactinal arm plates rod-like; [240.a] costal plates bearing transverse ridge of small sharp spinelets; [250.a] terminal plates small, about size of last pair of adambulacrals; [260.b] terminals irregularly shield-shaped; [280.a] marginals small; [290.c] marginals tubercular, more or less fused to adambulacral plates; [310.a] marginals unarmed proximally, beyond midgonadal region bearing 1 stout, fluted, bulbous-based acicular spine; [320.a] adambulacral plates higher than long; [330.c] adambulacrals discoidal; [340.b] furrow margin slightly indented, with distal projection; [350] number of furrow spines 2; [360.a] furrow spines short, sharp; [370.a] furrow spines near proximal end of adambulacrals; [380] number of subambulacral spines 2; [390.a] subambulacral spines long, stout, fluted, acicular; [420.a] ambulacral plates large, heavy; [430.e] ambulacrals dumbbell-shaped; [470.b] tubefeet moderately heavy; [480.a] mouth plates small, narrow; [490.g] mouth plates hourglass-shaped; [500] number of preoral spines 1; [510.a] preoral spines small, acicular; [520.b] preoral spines lateral; [530] number of lateral oral spines 0; [560] number of suboral spines 2; [570.a] suboral spines long, acicular; [580.b,c] one suboral spine near center of mouth plate, one distal; [620.a,b,c] pedicellariae on both surfaces of disc and arms, in rows or bands on arms; [630.b] pedicellariae fairly large.

COLOR.—Unknown.

TYPES.—USNM 12074 and 14858 (syntypes), Albatross Sta 2573, SE of Georges Bank, 3186 m, Sta 2685, S of Martha's Vineyard, 2079 m.

MATERIAL EXAMINED.—Syntypes; 4 arm fragments, USNM 12075, Fishing Vessel Grampus, no other data; 1 specimen, USNM E20951, Gerda Sta 226, Straits of Florida, 24°28′N, 80°16′W, 805 m.

DISTRIBUTION.—Georges Bank to the Straits of Florida; 805–3186 m.