Cranopsis cearensis Simone & Cunha, 2014, new species
Creators: name: Simone, Luiz Ricardo L.
name: Cunha, Carlo M.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Lepetellida
Fissurellidae
Cranopsis
Cranopsis cearensis

description: Cranopsis cearensis new species
Figures 48–55
Types. Holotype MZSP 106894. Paratypes: MNHN 25299, 1 shell, MNRJ 30824, 2 shells, MZSP 93940, 18 fragmentary shells; MZSP 90280, 19 fragments, MZSP 100415, 2 shells, all from type locality.
Type locality. Brazil. Ceará, off Fortaleza, Canopus bank, 2°12’43”S 38°18’52”W, 250 m (Coltro col., viii/ 2005).
Diagnosis. Apex slightly high, located preceding posterior third. Height ca. 40% of length; width ca. 80% of length. Sculptured by ca. 60 rounded radial ribs, relatively narrow, profile rounded, extending beyond shell edges; bearing transverse low scales extending on relatively wide interspaces between ribs forming comarginal sculpture. Foramen slightly deviated to right, flanked by low edges; located more posteriorly, separated from anterior edge.
Description. Shell size up to 15 mm; low; height ca. 40% length. Pure white. Protoconch of one convex whorl; situated on right; smooth, glossy; 270 µm. Foramen cuneiform (pointed anteriorly), width 16% of length; located at about 25% of shell length posterior to anterior edge; width 4% of shell width, length 38% of shell length; edges irregular (Figs 48, 50). Groove anterior to foramen narrow, flanked by pair of ribs as wide as radial ribs (Figs 48, 50); shifted to right by ca. 10° relative to longitudinal axis of shell. Beak curved ventrally, between middle and dorsal thirds of shell height; located between middle and posterior thirds of shell length (in dorsal view) (Figs 48, 52); teleoconch of one whorl; profile highly curved ventrally, as arc with center located in middle level of ventral surface, just on aperture level) (Figs 49, 51). Sculpture regular, of ca. 60 narrow, rounded, radial ribs (Figs 48, 49, 51, 52); about twice as tall as wide; lower secondary ribs between primary ribs, gradually increasing in width towards margin; interspaces between ribs as wide as ribs; transverse, semilunar, low scales arranged along ribs at regular intervals of 1/2–1/3 of ribs width; scales forming series of rectangular pits (ca. twice as wide as long); interspaces between successive scales with series of 10–12 striae in each pit, parallel to scales (Figs 54, 55); ca. 40 scales along ribs close to median line. Selenizone as wide as foramen; edges slightly higher than radial ribs, with sharp edges; lunules regular distributed, well-spaced (Figs 48–52). Aperture planar (Fig. 49), outline elliptical, width ca. 80% of length; edges undulating due to radial sculpture (Figs 50, 53). Inner surface smooth, glossy. Septum well-developed, 16% of shell height; 3 times longer than wide; ventral edge slightly concave, 19% of aperture width; forming concavity protecting posterior edge of foramen (Figs 50, 53).
Measurements (in mm). Holotype: 13.0 by 5.2; MZSP 93940, #1: 6.2 by 2.8.
Distribution. Known only from type locality.
Habitat. Sandy bottoms with gravel, 250 m (dead specimens).
Material examined. Types.
Etymology. The specific epithet is derived from the locality where the species was collected, in the littoral off Ceará.
description: Published as part of 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), pp. 437-468 in Zootaxa 3835 (4) on pages 445-446, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622