Calloarca (Coraliarca) nuttingi ( Dall, Bartsch & Rehder, 1938 )

Raines, Bret & Huber, Markus, 2012, 3217, Zootaxa 3217, pp. 1-106 : 17-19

Calloarca (Coraliarca) nuttingi ( Dall, Bartsch & Rehder, 1938)

Figures 7 G–I

Calloarca (Barbarca) nuttingi Dall et al., 1938: p. 26 , pl. 4, figs. 17–20.

Barbatia nuttingi Dall et al., 1938 — Kay, 1979: p. 503, figs. 162 I–J.

Barbatia cf. nuttingi Dall et al., 1938 — Rehder, 1980: p. 106, pl. 12, figs. 12–15.

Barbatia sp. cf. nuttingi ( Dall et al., 1938) — Brook & Marshall, 1998: p. 211; Spencer et al., 2011: p. 1.

Calloarca (Coraliarca) nuttingi ( Dall et al., 1938) — Severns, 2011: p. 430, pl. 196, fig. 6.

Material examined. Several hundred single valves (4.2 to 10.1 mm) from EI and SyG (BK), plus specimens from the Hawaiian Islands ( MHU) and Pitcairn Island (BK).

Diagnosis. Shell small, subovate, equivalve, inflated, not fragile. Umbones elevated. Posterior end curved but obliquely rounded at the junction with the ventral margin; anterior end well rounded. Exterior surface of fine, nodulous radial riblets. Ventral margin and hinge line subparallel. Hinge consisting of numerous teeth separated under the umbones, slanted, and larger distally. Color from dark tan to reddish brown, with white blotches or rays.

Remarks. Although the EI specimens are smaller, they conform well to Hawaiian material. Calloarca (Barbarca) nuttingi is the type species, by OD of Coraliarca Habe & Okutani, 1968 . As such, Rehder’s (1980) tentative identification is specifically confirmed. However, his selection of the related genus Barbatia is not.

Habitat. Commonly found at many locations around EI and SyG, in sand, from 10–80 m.

Distribution. Calloarca (Coraliarca) nuttingi is known from French Polynesia, Pitcairn Islands, Easter and Salas y Gómez Islands, Norfolk Island, Kermadec Islands and the Hawaiian Islands— E5.