Clarkcomanthus alternans ( Carpenter, 1881 )

Kogo, Ichizo, Fujita, Toshihiko & Kubodera, Tsunemi, 2019, Shallow-water Comatulids (Echinodermata: Crinoidea) from Ambon and Lombok Islands, Indonesia, Species Diversity 24, pp. 229-246 : 235

Clarkcomanthus alternans ( Carpenter, 1881)

Actinometra alternans Carpenter, 1881: 208 ; 1888: 330 (key).

Comantheria alternans —A. H. Clark 1912a: 90; 1913: 13; 1931: 488; Reichensperger 1913: 87.

Comanthus alternans —A. H. Clark 1908c: 206; H. L. Clark 1915: 101; 1921: 16; Rowe et al. 1986: 224, fig. 6a; Fabricius 1994: 1228; Messing 1994: 239 (list); 1998b: 189 (table); 2007: 97; Rowe and Gates 1995: 143; Kogo 1998: 33, fig. 26; 2002: 9; Lane et al. 2000: 476 (table); Kirkendale and Messing 2003: 530; Kogo and Fujita 2005: 332; Mekhova and Britayev 2012: 915.

Clarkcomanthus alternans — Summers et al. 2014: 336.

Material examined. 8 specimens. Ambon Is. NSMT E-8110 (1 specimen), Pombo I ., lagoon, November 27, 1992; NSMT E-8114 (1), Pombo I ., 10 m, November 28, 1992. Lombok Is. NSMT E-8197 (1), Gili Air I ., February 3, 1994; NSMT E-8242 (1), Gili Air I ., February 5, 1994; NSMT E-8255 (2), E-8256 (1), E-8260 (1), Kodek, February 15, 1994 .

Description. Centrodorsal thin, small, pentagonal or stellate in aboral view, 2.5–3.5 mm across, up to 0.4 mm thick, lacking cirrus sockets and cirri. Radials trapezoidal, in contact laterally. IBr 2: Ibr 1 oblong, in contact laterally; Ibr 2 (axil) low pentagonal, free laterally. IIBr 4(3+4). IIIBr 2, rarely 4(3+4); outer brachials twisted outward. IVBr and VBr 4(3+4). Arms 48–122, 60– 100 mm long; first syzygy at br 3+4. PII longest, 9–16 mm long, of 32–44 segments; combs of 6–10 teeth confluent with outer edge of pinnulars; 2–3 distal pinnulars with small secondary tooth. Pinnule combs to P 4, rarely to P 5 –P 7.

Distribution. Southern Vietnam ( Mekhova and Britayev 2012); western, northern and eastern Australia, Indonesia, New Guinea, New Caledonia, Philippines ( Rowe et al. 1986); Sulu Sea, Papua New Guinea, Micronesia ( Messing 1994, 1998b, 2007; Kirkendale and Messing 2003); South China Sea ( Lane et al. 2000); Japan ( Rowe et al. 1986; Kogo 1998, 2002; Kogo and Fujita 2005). Depth range: 0–90 m ( Lane et al. 2000).