Ketosia riosi, Santos, Franklin Noel Dos & Absalão, Ricardo Silva, 2006

Santos, Franklin Noel Dos & Absalão, Ricardo Silva, 2006, A new genus of Barleeidae Gray, 1857 (Mollusca, Gastropoda) and the first occurrence of the genus Pseudodiala Ponder, 1967 off the Brazilian coast, Zootaxa 1232, pp. 59-68 : 61

Ketosia riosi new species

( Figs. 1–5 )

Description

Shell conical, whorls slightly convex anteriorly, brown­reddish, lustrous. Protoconch paucispiral, dome­shaped. Surface with irregular pits. Teleoconch smooth with four whorls; with microscopic pits. Suture impressed. Base slightly rounded. Aperture oval, separated from teleoconch by depression. Lip thin, darker than teleoconch. Umbilicus absent. Animal unknown.

Dimensions

Holotype with 3.5 teleoconch whorls; length 2.2 mm.

Type­material

Holotype: MNRJ 10503. Paratypes 1: MNRJ 10504, [2]; paratype 2: IBUFRJ 14695 [6]; paratype 3: MORG 50446, [2]; paratype 4: MZSP 55461 [3]; paratype 5: MNHN, [2]. Paratypes 1–5: sta. 21º36’32.537’’S 40º39’18.846’’W, 30.vi.2002, Povoação, Espírito Santo state, 10–30 m; paratype 6: IBUFRJ 12798: REVIZEE CENTRAL #vv16, 21 º10’ S 40º27’ W, 27 m, 26.ii.1996, [1].

Figures

FIGURES 1 – 5. Ketosia riosi n. sp. ­ 1: holotype (MNRJ 10503), length 2.2 mm; 2: paratype (IBUFRJ 14695) length: 1.7 mm; 3: detail of the teleoconch of paratype; 4: protoconch of paratype; 5: detail of sculpture of the protoconch of paratype. Scale bar: 1: 500 m; 2: 200 m; 3: 10 m; 4: 100 m; 5: 20 m.