Microlinices ombratus, 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 : 578-580

publication ID	https://doi.org/ 10.5252/z2014n3a2
persistent identifier	https://treatment.plazi.org/id/7C5BCE66-FFC5-195F-83FF-D31D979BFE3F
treatment provided by	Felipe
scientific name	Microlinices ombratus
status	n. gen., n. sp.

Treatment

Microlinices ombratus View in CoL n. gen., n. sp. ( Fig. 8A, B View FIG )

HOLOTYPE. — MNHN 27149 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 c. 3 mm, c. 84% taller than wide. Umbilicus open, narrow and simple. Sculpture lacking, subsutural narrow shoulder present.Protoconch flattened, of 1 whorl. Spire angle c. 70°.

DESCRIPTION

Shell ( Fig. 8A, B View FIG )

Diameter of 2.7 mm; height c. 120% of width; general form somewhat tall turbinoid. Color pale brown. Protoconch flattened, of 1 rounded whorl; surface smooth, eroded; diameter c. 0.5 mm, occupying c. 20% of upper shell surface.Teleoconch of c. 3 whorls; suture marked by subsutural shoulder, performing angle of c. 110° in relation to whorl’s profile; upper surface of shoulder planar and almost horizontal, occupying c. 10% of whorl’s area; spire angle c. 70°. Sculpture absent except for growth lines and axial weak undulations; undulations stronger in umbilicus. Aperture oval, narrow, occupying c. 55% of shell height and c. 44% of shell width; outer lip thick, orthocline, simple; inner lip widely concave, upper half covered by thin callus, lower half as thick edge ( Fig. 8A View FIG ). Umbilicus simple, narrow, open; its aperture occupying c. 6% of lower surface.

Measurements (width and height in mm)

Holotype ( Fig. 8A, B View FIG ): 3.2 × 2.7.

Habitat

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

Etymology

The specific epithet is derived from the Portuguese word ombro, meaning shoulder, an allusion to the shoulder-like subsutural carina, characteristic of the species.