Eunaticina abyssalis, Simone, 2014

Simone, Luiz Ricardo L., 2014, Taxonomic study on the molluscs collected during the Marion-Dufresne expedition (MD 55) off SE Brazil: the Naticidae (Mollusca: Caenogastropoda), Zoosystema 36 (3), pp. 563-593 : 586-587

publication ID	https://doi.org/ 10.5252/z2014n3a2
persistent identifier	https://treatment.plazi.org/id/7C5BCE66-FFDD-1956-8234-D37A952EFE1F
treatment provided by	Felipe
scientific name	Eunaticina abyssalis
status	sp. nov.

Treatment

Eunaticina abyssalis n. sp.

( Fig. 10 View FIG E-K)

HOLOTYPE. — MNHN 27158 View Materials .

TYPE LOCALITY. — Brazil. Espírito Santo: off Itaúnas, MD 55 sta. CB 79, 19°01’S, 37°47’W, 1500-1575 m depth, 25. V.1987 (coll. Bouchet, Leal & Métivier).

DIAGNOSIS. — Shell almost as tall as wide. Umbilicus completely closed by thick callus. Sculpture of narrow axial cords uniformly distributed. Protoconch of 3 whorls.

DESCRIPTION

Shell

Diameter of c. 27 mm; height c. 77% of width; general form broadly discoid. Color pale beige. Protoconch flattened ( Fig. 10I, J View FIG ), of 3 rounded whorls; surface smooth, shining; suture somewhat deep; transition with teleoconch clear, orthocline; diameter c. 1.6 mm, occupying c. 6% of upper shell surface ( Fig.10G View FIG ).Teleoconch of c. 2.5 whorls; suture almost planar, marked by small elevation in lower whorl on preceding whorl ( Fig. 10I, K View FIG ). Sculpture absent in first 3/4 whorl, with smooth surface; after this unvarying axial cords uniformly distributed; each cord very narrow, low; interspaces c. 5 × cord width; c. 8 wide and low spiral threads barely visible in middle level of body whorl ( Fig. 10 View FIG F-H). Aperture oval, wide, occupying c. 90% of shell height and c. 58% of shell width ( Fig. 10E, H View FIG ); outer lip broken, fragile, orthocline; inner lip widely concave, upper half covered by thin callus, lower half as thick edge (Fig. A). Umbilicus fully covered by thick smooth callus.

Measurements (width and height in mm)

Holotype ( Fig. 10 View FIG E-K): 26.6 × 20.6.

Habitat

1500-1575 m depth, compact blocks (no living specimen).

Etymology

The specific epithet is derived from the Latin word abyssos, meaning deep sea, an allusion to the abyssal environment where the sample was collected.