Clatrosansonia troendlei, Renard & Bouchet, 2003

Renard, Jacques Le & Bouchet, Philippe, 2003, New species and genera of the family Pickworthiidae (Mollusca, Caenogastropoda), Zoosystema 25 (4), pp. 569-591 : 574-575

Clatrosansonia troendlei n. sp.

( Fig. 3 )

TYPE MATERIAL. — Holotype (dd) in MNHN.

TYPE LOCALITY. — Afaahiti, Tahiti, Society Is, 25 m.

ETYMOLOGY. — The specific epithet honors Jean Tröndle, of La Force ( France), an expert of the mollusc fauna of French Polynesia and a companion of field work in New Caledonia.

MATERIAL EXAMINED. — A total of 1 complete and 2 fragmentary specimens.

French Polynesia. Afaahiti , Tahiti, 25 m, 1985, leg. Tröndle, 1 dd (holotype; MNHN). — Hao, Tuamotu, 1984, leg. Le Renard, 1 fragm. ( MNHN) .

New Caledonia. Off Nouméa , Grand Récif Aboré, 22°22.21’N, 166°15’E, 15-35 m, 1992, leg. Bouchet & Marshall, 1 fragm. ( MNHN; identification uncertain) .

DISTRIBUTION. — Pacific Ocean: Society Islands; New Caledonia?

DESCRIPTION

Holotype ( Fig. 3 ). Shell very small, turbinate and depressed. Protoconch ( Fig. 3C ) of 2.5 convex whorls, slightly styliform, slanting with respect to teleoconch axis. Sculpture of protoconch II consisting of six granular spiral cords, unequal, unevenly spaced. Adapical cord separated from suture by abrupt sutural ramp. Last half-whorl of larval shell with deep, narrow notch lined with recurved lip. Teleoconch with three convex whorls, separated by channeled suture. First teleoconch whorl with two spiral cords. Complete spiral sculpture, consisting of five equal equidistant cords, formed on the second teleoconch whorl; these cords separated by narrow and deep furrows. Axial sculpture oblique and much fainter than spiral cords. Axial and spiral sculpture together forming very regular reticulation, with rectangular spirally elongate subunits, and prominent nodes at intersections. Body whorl of liotiid appearance, occupying 3/4 of total shell height, very convex and with only slight keel. Base with very broad umbilicus, separated from base by large muricated cord. Inner wall of umbilicus with three cords, parallel to periumbilical cord; between umbilicus and peripheral keel, base bearing eight nearly smooth concentric cords, with obsolete incremental striae between them. Aperture circular, surrounded by smooth margin and peristome with many concentric folds. In lateral view, peristome forming angle of 45° with columellar axis. Labral rib of peristome extending outwardly; 12 regular spiral cords of last whorl extending onto side of peristome. In addition to this main sculpture, microsculpture of finely granular spiral lamellae present.

Dimensions

H = 1.0 mm, D = 1.2 mm.

REMARKS

Clatrosansonia troendlei n. sp. is the most depressed of all Clatrosansonia n. gen., and thus resembles the type species C. philippina n. comb. However, it can be distinguished by its finer spiral sculpture (12 spiral cords on the body whorl instead of seven in C. philippina n. comb.), and spirally elongated (not squared) reticulations.

Figures

FIG. 3. — Clatrosansonia troendlei n. gen., n. sp., holotype, Tahiti, French Polynesia (MNHN), H = 1.0 mm; A, B, apertural and side views; C, protoconch. Scale bar: C, 50 µm.