Endoxocrinus (Diplocrinus) alternicirrus alternicirrus (Carpenter, 1882)

Figures 13 a–b.

Synonymy: Pentacrinus alternicirra Carpenter 1882: 167; Pentacrinus alternicirrus Carpenter, 1884: 321; Endoxocrinus alternicirrus A.H. Clark, 1908b: 151; Cenocrinus (Diplocrinus) alternicirrus Döderlein, 1912: 20 –21; Diplocrinus alternicirrus A.H. Clark, 1923: 11; Endoxocrinus alternicirrus Rasmussen, 1978: T857; Diplocrinus (Diplocrinus) alternicirrus Roux, 1980: 119; Endoxocrinus (Diplocrinus) alternicirrus var. alternicirrus David, 1998: 203 (unpublished data); Endoxocrinus (Diplocrinus) alternicirrus Roux et al. 2002: 820 .

Emended diagnosis

A subspecies of E. (D.) alternicirrus with 12–32 arms (mode 20), up to 15.3 cm long (mean 10.7 cm); proximal brachitaxes contiguous; arm branching frequently endotomous; number of internodals per mature noditaxis 5–10 (mode 5, usually more than 50%); stalk length variable, up to 14 cm (mean 8.7 cm); proximalmost diameter rarely more than 5.8 mm (mean 4.8 mm); nodals bearing 1–5 cirri, usually 2 or 3 cirri alternately, those at one node corresponding to the place without cirri at the node immediately following or preceding; length of cirrals 1.4–2 mm (mean 1.7 mm).

Occurrence

Central Pacific (Tahiti, Hawaii), western Pacific from Kermadec Islands and New Caledonia (David 1998) to Taiwan (Améziane et al. 2005) and Japan (Kogo 1998), at depths from 625 m to 1476 m.