Cornisepta aninga, 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 : 441-442

publication ID

https://doi.org/ 10.11646/zootaxa.3835.4.2

publication LSID

lsid:zoobank.org:pub:F492B5ED-0CA7-436B-94AF-EE4C99D630AF

DOI

https://doi.org/10.5281/zenodo.6133939

persistent identifier

https://treatment.plazi.org/id/EF2F87FC-1B62-C40C-FF58-BAFAFBC5EB87

treatment provided by

Plazi

scientific name

Cornisepta aninga
status

sp. nov.

Cornisepta aninga View in CoL 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 View FIGURES 19 – 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 View FIGURES 19 – 27 ). 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 View FIGURES 19 – 27 ), 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 View FIGURES 19 – 27 ), sometimes slightly concave ( Figs 23–25 View FIGURES 19 – 27 ), 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.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

SubClass

Vetigastropoda

Order

Lepetellida

Family

Fissurellidae

SubFamily

Emarginulinae

Genus

Cornisepta

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