Taxonomical study on the mollusks collected in Marion-Dufresne (MD 55) and other expeditions to SE Brazil: the Fissurellidae (Mollusca, Vetigastropoda) Author Simone, Luiz Ricardo L. Author Cunha, Carlo M. text Zootaxa 2014 3835 4 437 468 journal article 10.11646/zootaxa.3835.4.2 01da15e5-14ca-4506-89fd-2055b906f4ff 1175-5326 249622 F492B5ED-0CA7-436B-94AF-EE4C99D630AF Cranopsis hycavis new species Figures 28–30 Types . Holotype MNHN 25292. Type locality : Brazil . Espírito Santo; off Conceição da Barra, continental slope of Abrolhos, 18°59’S 37°50’W , 637 m (MD55, sta. CB76; Bouchet, Leal & Métivier col. 27/v/1987 ). Diagnosis. Apex curved backwards, located in middle line in profile. Height ca. 75% of length; width ca. 80% of length. Sculpture of 36 radial cords, composed of aligned pustules. Foramen flanked by tall, projected edges; located towards dorsal, above ventral half of shell profile. Description. Shell size 1.9 mm; tall, bluntly conical; height ca. 75% of length. Pure white. Protoconch of 1 convex, rounded whorl (Fig. 29); situated on right in posterior edge of apex; smooth, diameter 150 µm. Foramen cuneiform (pointed anteriorly), width ca. 25% of length; located dorsally, preceding anterior slope; ca. 10% of shell width, approximately 34% of shell length (Figs 28, 30). Groove anterior to foramen very narrow; flanked by pair of cords twice as wide as neighboring cords, forming wide, median thread. Shell profile steep; apex curved ventroposteriorly, located on posterior edge (in dorsal view); teleoconch of ca. 3/4 whorl; apical angle in lateral view ca. 50° (Fig. 29). Sculpture composed of 36 narrow radial cords surrounding beak (Figs 28, 29), composed of aligned small pustules; each cord gradually increasing in width towards aperture, and augmenting in number with shell size by intercalated cords; composed of aligned small pustules, slightly elevated, rounded, separated from neighbor pustules in line by space ca. 1/2 of its width; interspaces between successive radial cords ca. 3 times their width; ca. 40 pustules along cords close to median line. Selenizone well-marked, narrower than fissure; edges as tall as radial cords, continuation from those of fissure, projected dorsally, with sharp edges; lunules regularly distributed, closely spaced (Fig. 28). Aperture planar (Fig. 29), outline elliptical, width ca. 80% of length; edge simple. Inner surface smooth, glossy (Fig. 30). Septum ca. 50% of shell height; as high as wide, ventral edge slightly concave, ca. 40% of aperture width; gradually narrowing to posterior edge of fissure. Measurements. Holotype : 1.9 by 1.4 mm. Distribution. Known only from type locality. Habitat. Sandy bottoms, 637 m (dead specimen). Material examined. Only the holotype . Etymology. The specific epithet is derived from the Paritintin native language, hykav , meaning few, little ( Betts 1981 ); an allusion to delicate few radial sculpture of the shell.