Cornisepta aninga 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
Cornisepta
Cornisepta aninga

description: Cornisepta aninga new species
Figures 17–27
Types. Holotype MNHN 25287. Paratypes: MNHN 25288, 32 shells, MZSP 102942, 10 shells, MNRJ 25962, 5 shells, all from type locality. Brazil. Espírito Santo; continental slope of Abrolhos (MD55; Bouchet, Leal & Métivier col., 27/v/1987); off Regência, 19°40’S 37°48’W, 790–940 m, MNHN 25289, 1 shell (sta. CB77); off Itaúnas, 19°00’S 37°49’W, 950–1050 m, MNHN 25290, 1 shell (sta. DC72), 18°59’S 37°48’W, 607–620 m, MNHN 25291, 1 shell (sta. DC73).
Type locality. Brazil. Espírito Santo; continental slope of Abrolhos, off Itaúnas, 18°59’S 37°50’W, 295 m (MD55 sta. DC75; Bouchet, Leal & Métivier col., 27/v/1987).
Diagnosis. Shell slightly curved posteriorly. Height 90–93% of length. Sculptured by pustules aligned in chevrons in lateral view, ca. 30 pustules per row (close to aperture).
Description. Shell size ca. 3.0 mm; highly conical, slightly arched posteriorly (Figs 19, 20, 23–25, 27); height 90–93% of length. White, translucent. Protoconch not present. Foramen terminal, apical, almost circular, width ca. 90% of length; turned towards dorsal; ca. 1.5% of aperture area; edges rather irregular (Figs 21, 23, 26). Shell broadens gradually towards aperture, aperture elliptical; apical angle ca. 40°, total shell angle ca. 40°. Outer sculpture consists of small pustules (Figs 17, 19–21, 23–24, 26–27), arranged in chevrons (concavity ventral), angle of ca. 25° in relation to vertical axis; this pattern somewhat more regular towards apex, pustules increasing in number with growth; each pustule volcano-shaped, surrounded by smooth area as wide as pustule in row of each chevron (Fig. 26), up to 10 times as wide between rows of chevrons (Fig. 17); intersection of anterior and posterior halves of chevrons, in lateral surface, sometimes intercalated. Aperture planar (Figs 19–20, 27), sometimes slightly concave (Figs 23–25), elliptical, width 72% of length; edges somewhat irregular. Inner surface smooth, glossy (Figs 18, 22). Septum ca. 60% of shell height; 3 times higher than wide, ventral edge slightly concave, ca. 60% of aperture width; gradually narrowing up to posterior edge of foramen.
Measurements. Holotype: 3.2 by 2.8; paratypes MZSP 102942, #1: 2.8 by 2.2 (Figs 17–18); #2: 3.0 by 2.5, #3: 2.8 by 2.5.
Distribution. Continental slope off Espírito Santo, Brazil.
Habitat. Sandy mud bottoms, 295–1050 m (dead specimens).
Material examined. Types.
Etymology. The specific epithet is derived from the Tupy native language aninga, meaning bristle hair, an allusion to the outer surface of the shell resembling gooseflesh. Noun in apposition.
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 441-442, DOI: 10.11646/zootaxa.3835.4.2, http://zenodo.org/record/249622