Microlinices apiculus, 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 : 580

publication ID	https://doi.org/ 10.5252/z2014n3a2
persistent identifier	https://treatment.plazi.org/id/7C5BCE66-FFDB-195F-81A8-D37A94C1FD5E
treatment provided by	Felipe
scientific name	Microlinices apiculus
status	n. gen., n. sp.

Treatment

Microlinices apiculus View in CoL n. gen., n. sp. ( Fig. 8 View FIG C-G)

HOLOTYPE. — MNHN 27150 View Materials .

PARATYPES. — MNHN 27151 View Materials , 9 View Materials shells ; MZSP 105146 View Materials , 6 View Materials shells from type locality .

TYPE LOCALITY. — Brazil. Espírito Santo: off Conceição da Barra, MD 55 sta. CB 76, 18°58’S, 37°49’W, 637 m, 27. V.1987 (coll. Bouchet, Leal & Métivier).

DIAGNOSIS. — Shell c. 5 mm, c. 105-118% taller than wide. Umbilicus open, narrow, upper region covered by thick callus, inner middle fold wanting. Sculpture lacking, surface opaque, white. Protoconch blunt, of 1.5 whorls, normally eroded. Spire angle c. 90-110°.

DESCRIPTION

Shell ( Fig. 8 View FIG C-G)

Diameter of c. 5 mm; height c. 105-118% of width; general form globose. Color pure white, mostly with irregular erosion furrows scantly splayed on older portions. Protoconch blunt, of 1.5 rounded whorls ( Fig. 8D, F View FIG ); surface smooth, opaque; diameter c. 0.9 mm, occupying c. 18% of upper shell surface. Teleoconch of c. 2.5 whorls; suture well marked; spire angle c. 90-110° ( Fig.8D, G View FIG ). Sculpture absent except for growth lines and axial weak undulations; undulations slightly stronger in umbilicus. Suture shallow, marked by subsutural low shoulder at angle of c. 130° ( Fig. 6D, E View FIG ). Aperture semicircular, wide, occupying c. 70% of shell height and c. 43% of shell width; outer lip thick, weakly prosocline ( Fig. 8E View FIG ), simple; inner lip slightly concave to almost straight ( Fig. 8C, G View FIG ), upper half covered by callus, about as wide as lower half. Umbilicus lacking middle fold, narrow, open; c. 1/2 covered by callus with straight, vertical edge; its aperture occupying c. 5% of lower surface.

Measurements (width and height in mm)

Holotype ( Fig. 8 View FIG C-F): 5.3 × 5.6.

Paratype: MZSP 105146 ( Fig. 8G View FIG ): 4.4 × 5.2.

Habitat

367m depth, muddy bottoms (no living specimens).

Etymology

The specific epithet is derived from the Latin word apiculus , meaning point, tip, an allusion to the pointed apex of the shell.