Zeidora crepidula, Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014

Simone, Luiz Ricardo L. & Cunha, Carlo M., 2014, Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda), Zootaxa 3835 (4), pp. 437-468 : 461

Zeidora crepidula new species

Figures 133–134

Types. Holotype MNHN 25322.

Type locality. Brazil. Espírito Santo; off Regência, continental slope of Abrolhos, 19°40’S 37°48’W, 790–940 m (MD55, sta. CB77; Bouchet, Leal & Métivier col, 27/v/1987).

Diagnosis. Shell slightly curved to left. Height ca. 40% of length; width ca. 55% of length. Outer surface slightly sculpted by ca. 70 thin radial cords, and barely more developed concentric cords, forming delicate reticulation, interspaces ca. twice cords’ width. Slit short, ca. 12% of shell length. Septum ca. 17% of shell length.

Description. Shell size ca. 5.5 mm; low, elongated, limpet-like; height ca. 40% of length. Pure white. Protoconch as in preceding species: see above for comment; size 330 µm. Slit rectangular, widely opened anteriorly, posterior end rounded, width ca. 60% of length; ca. 15% of shell width and about 12% of shell length; edges simple, rather irregular (Fig. 133, 134). Profile as in preceding species; posterior beak blunt, slightly longer, exceeding ca. 15 % of shell length posterior to aperture. Sculpture represented by thin radial cords and feebly more developed (mainly in posterior region) concentric cords (Fig. 133), forming delicate regular reticulate pattern, ca. 70 radial cords close to shell edge, and ca. 90 concentric cords close to median line; each cord with approximately same width from apical region to shell edges, secondary cords gradually appearing towards aperture edge; cords fold-like, running relatively regularly; interspaces between successive radial cords ca. twice their width, concentric cords with interspaces equivalent to their width. Selenizone similar to preceding species, except for smoother inner surface and by lunules more crowded (Fig. 133). Aperture planar (Fig. 134), outline elliptical, width 62% of length; edges simple. Inner surface smooth, glossy (Fig. 134). Septum similar to preceding species, 17% of shell length; ca. 3 times wider than high; and ca. 90% of aperture width. Shell edges exceeding ca. 5% shell width surrounding septum, bearing regular denticulate holes, ca. 15 pairs of transverse minute teeth restricted to shell edge.

Measurements (in mm). Holotype: 4.9 by 2.6.

Distribution. Only known from type locality.

Habitat. Sandy mud bottoms, 790–940 m (dead specimen).

Material examined. Type.

Etymology. The specific epithet is derived from the Greek, krepidos or crepido, meaning sandal, being crepidula a diminutive; an allusion to the general form of the shell. The epithet is also for the resemblance to species of the genus Crepidula Lamarck, 1799 .