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 Cornisepta uirapa new species ( Figures 1–5 ) Types . Holotype MNHN 25281. Type locality. Brazil . Espírito Santo; off Regência, continental slope of Abrolhos, 19°40’S 37°48’W , 790–940 m depth (MD55, sta. CB77; Bouchet, Leal & Métivier col, 27/v/1987 ). Diagnosis. Slightly curved posteriorly. Height ca. 87% of length. Sculptured by uniformly distributed small pustules arranged in alternate rows, ca. 80 per row (close to aperture). Description. Shell height ca. 5 mm ; highly conical, slightly arched posteriorly ( Figs 1, 2 ); height 87% of length. White, translucent. Apex about equidistant from anterior and posterior margins. Protoconch no longer present. Foramen terminal, elliptical, width ca. 60% of length; turned dorsal; occupying ca. 2% of aperture area in dorsal view; edges rather irregular ( Fig. 4 ). Shell increasing in width towards aperture uniformly, gradual; main axis almost vertical; apical angle ca. 35°, total shell angle ca. 40°. Outer sculpture uniform rows of small pustules ( Figs 1–3 ), ca. 80 per row close to aperture, slightly intercalated in adjacent rows; this mosaic somewhat regular towards apex, pustules increasing in number from dorsal to ventral; each pustule surrounded by smooth area equivalent to 3 times its width. Aperture in same plane (straight), elliptical, width approximately 72% of length; edges slightly irregular. Inner surface smooth, glossy ( Fig. 5 ). Septum ca. 1/2 shell height; ca. 3 times higher than wide, ventral edge shallowly concave, almost straight, ca. 1/2 of aperture width; gradually narrowing up to posterior edge of fissure. Measurements. Holotype : 4.7 by 5.3 mm. FIGURES 19–27: Cornisepta aninga n. sp. types. Fig. 19: holotype MNHN 25287, right view (L 3.2 mm). Fig. 20: same, left view. Fig. 21: same, dorsal view. Fig. 22: same, ventral view. Fig. 23: paratype MNHN 25288#1, young specimen left view (L 2.7 mm). Fig. 24: same station, #2, young specimen (L 2.4 mm). Fig. 25: same station, #3, very young specimen, right view (L 1.5 mm). Fig. 26: paratype MZSP 102942, SEM, dorsal-slightly left view (L 2.1 mm). Fig. 27: same, right view. FIGURES 28–30: Cranopsis hycavis n. sp. holotype MNHN 25292 (L 1.9 mm). Fig. 28: dorsal view. Fig. 29: right view. Fig. 30: ventral view. FIGURES 31–36: Cranopsis nymphalis n. sp. holotype MNHH 25293 (L 7.2 mm). Fig. 31: detail of anterior region, dorsal view (lateral side= 4 mm). Fig. 32: whole dorsal view. Fig. 33: right view. Fig. 34: ventral view. Fig. 35: detail of apex, right view (right side= 3 mm). Fig. 36: same left view (left side= 1 mm). Distribution. Only known from type locality. Habitat. Sandy mud bottoms, 790–940 m depth (dead specimen). Material examined. Holotype . Etymology. The specific epithet is derived from the Tupy native language uirapa , meaning arc, arched, in allusion to the arched shape of the shell.