Clarkcomanthus sp. 2

Kogo, Ichizo, Fujita, Toshihiko & Kubodera, Tsunemi, 2019, Shallow-water Comatulids (Echinodermata: Crinoidea) from Ambon and Lombok Islands, Indonesia, Species Diversity 24, pp. 229-246 : 236

Clarkcomanthus sp. 2

Material examined. 1 specimen. Ambon Is. NSMT E-8140 (1 specimen), Tial, 10 m, November 30, 1992 .

Description. Centrodorsal discoidal, roundish in aboral view, 1 mm across, 0.4 mm thick, with cirrus sockets in 1 aligned row. Cirri VI, 9, 5 mm long. Cirrals beyond 1 st longer than wide, smooth, no aboral spine; opposing spine prominent. Radials trapezoidal, in contact laterally. IBr 2: Ibr 1 oblong; Ibr 2 (axil) pentagonal, free laterally; IIBr 4(3+4). Arms 11, 38 mm long; first syzygy at br 3+4; brachials of middle arm with spiny distal margin. P 1 9 mm long, of 26–28 segments; combs of 4–7 teeth non-confluent, with pointed tip; no secondary tooth. P 2 and P 3 absent. P 4 3.5 mm long, of 11 segments; combs of 0–4 teeth. P 5 4 mm long, of 12 segments, no comb. Middle pinnules slender, not swollen without recognizable gonad; pinnulars with spiny distal margin.

Remarks. This specimen is supposedly a young individual of a species of Clarkcomanthus , for having a small centrodorsal, non-confluent teeth of combs, and distalmost pinnule comb restricted to on proximal pinnules. The specimen resembles to C. exilis and C. mirus for holding nonconfluent teeth. Though the distalmost comb is on P 1 or P 2 in these two species, while on P 4 in this specimen. It also resembles to Comanthus sp. (NSMT E-8195) in absence of P 2 and P 3, but this specimen has non-confluent teeth, while Comanthus sp. has confluent teeth.