Dimya mimula Dall, Bartsch & Rehder, 1938

Raines, Bret & Huber, Markus, 2012, 3217, Zootaxa 3217, pp. 1-106 : 31

Dimya mimula Dall, Bartsch & Rehder, 1938

Figures 13 C–D, 14 E–F

Dimya mimula Dall et al., 1938: p. 78 , pl. 19, figs. 1–2.

Dimya mimula Dall et al., 1938 — Severns 2011: p. 454, pl. 207, fig. 2.

Material examined. Several single valves (4.5 to 6 mm) from EI (BK), plus the Hawaiian USNM holotype of D. mimula .

Diagnosis. Shell small, orbicular-elongate, inequivalve. RV attached to the substrate, no byssal foramen. LV sculptured with somewhat scaly radial riblets. Prodissoconch somewhat worn, but appears round and smooth. Interior of adult valves with finely denticulate margins. Two distantly placed elongate muscle scars, with the posterior bilobed. Yellowish white outside, whitish inside.

Remarks. Dimya mimula is an exceedingly rare species. As far as is known, this is the first time it has been recorded since its description from a single upper valve collected from a depth of 235 m.

The upper valves of the EI specimens match the USNM holotype of D. mimula ( Figs. 14 E–F) well and the largest valve (13.8 mm) also reaches nearly its 14 mm size. The radial surface sculpture is characteristic for this species. The bilobed posterior scars are well visible ( Figs. 13 D, 14 F). The rounded contour, yellowish color and notably the characteristic dense crenulations along the outer margins ( Fig. 13 D) are all consistent with D. mimula .

Habitat. Occasionally found at several locations around EI, in sand, from 30–80 m.

Distribution. Dimya mimula was previously only known from the Hawaiian Islands, but has now been extended to Easter Island— E2.