Turbonilla anselmopenasi, Lygre, Frøydis & Schander, Christoffer, 2010

Lygre, Frøydis & Schander, Christoffer, 2010, Six new species of pyramidellids (Mollusca, Gastropoda, Pyramidelloidea) from West Africa, introducing the new genus Kongsrudia, Zootaxa 2657, pp. 1-17 : 9

Turbonilla anselmopenasi new species

( Fig 5 A–D )

Type material: Holotype, Bergen Museum ZMBN 86659.

Type locality: Gabon station G11, 02 º 40’S, 09º 14’E, 90 m.

Material examined: Type material.

Etymology: The species is named after Anselmo Peñas, Barcelona, Spain who has worked extensively on West African Pyramidellids, and is a dear friend.

Description: Shell small, slender, conical towards subcylindrical, white and shiny with rounded apex. Protoconch of type A-II. Whorls slightly convex. Suture shallow. Axial ribs elevated, straight and opisthocline. Axial ribs equally broad as interspaces, disappearing at the periphery of the ultimate whorl. The base is smooth. Sculpture seen in interspaces consists of both fine macrostructure and microstructure, the sculpture is strongest abapically and consists of spiral striae and vertical grooves. Interspaces between spiral striae are broader in the middle of the whorl and more tightly spaced apically than abapically. Vertical grooves more tightly spaced apically gives finer sculpture there. Aperture subrectangular. No columellar tooth. No umbilicus.

Distribution: Gabon, 90 m.

Remarks: The combination of shape and the very fine sculpture makes this species fairly easy to distinguish from other species of Turbonilla s. l. Turbonilla bedoyai Peñas & Rolan, 1997 has a similar sculpture between the axial ribs, but in this species the sculpture is evenly spaced.

Figures

FIGURE 5 A – D. Turbonilla anselmopenasi n. sp. A: Holotype, teleoconch, station G 11, Gabon, 02 º 40 ’ S 09 º 14 ’ E; B-D: Holotype, details of the sculpture and microstructure.