Endoxocrinus (Diplocrinus) alternicirrus alternicirrus ( Carpenter, 1882 )

David, Jerome, Roux, Michel, Messing, Charles G. & Ameziane, Nadia, 2006, Revision of the pentacrinid stalked crinoids of the genus Endoxocrinus (Echinodermata, Crinoidea), with a study of environmental control of characters and its consequences for taxonomy, Zootaxa 1156, pp. 1-50 : 41-42

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 alternicirrus David, 1998: 203 (unpublished data); Endoxocrinus (Diplocrinus) alternicirrus Roux et al. 2002: 820 .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.

Figures

FIGURE 13. Pacific phenotypes. Specimens from New Caledonia. a and b: alternicirrus phenotype, a: specimen BC 3, b: stalk of specimen TA 20; c and d: sibogae phenotype, specimen BE 8.