Triforis pura E.A. Smith, 1903

Albano, Paolo G., Bakker, Piet A. J. & Sabelli, Bruno, 2019, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Natural History Museum of the United Kingdom, London, Zoosystematics and Evolution 95 (1), pp. 161-308 : 161

Triforis pura E.A. Smith, 1903

Figure 90

Triforis pura E.A. Smith 1903: 614, pl. 35, figs 20, 21.

Type locality.

Mahlos Atoll, 4-24 fathoms, Maldives.

Type material.

Syntypes: NHMUK 1903.9.17.14: 1 specimen (glued on paper), Maldive Islands .

Original description.

Testa elongata, alba, clathrata, granulata; anfractus circiter 20, fere plani, costis spiralibus tribus granosis inaequalibus (costa mediana minima) cincti, inter costas longitudinaliter costati, ultimus costis senis (prope labrum duabus intercalatis) ornatus; canalis dextrorsus, clausus, laevis; apertura irregulariter ovata, obliqua; labrum antice prominens, postice recedens; columella callo crassiusculo reflexo induta.

Longit. 14 mm., diam. 3.

Of the three spirals the uppermost is a little stouter than the lowermost and the central one is rather finer than the latter. The granules form oblique rows of three, being connected by the longitudinal costae. The suture is thread-like.

Translation of the Latin text.

Elongated shell, white, cancellated, granose; about 20 whorls, nearly flat, encircled by three unequal tuberculated spiral rows (the intermediate the least), ribbed longitudinally among the rows, the last whorl with six cords (with two additional ones near the lip); anterior siphon dextral, closed, slender; aperture irregularly ovate, oblique; lip anteriorly projecting, posteriorly retracting; columella covered by a rather thick bent callus.

Height 14 mm, diameter 3 mm.

Diagnosis.

Syntype 14.1 mm high. Shell slightly cyrtoconoid, syntype without the apex. Teleoconch of minimum 13 flat whorls with three spiral cords with faint tubercles at the intersections with prosocline axial ribs; the first cord is remarkably thicker than the other two. A fourth smooth suprasutural cord is easily visible. Peristome with an additional spiral cord and a shallow posterior sinus. Base with two weakly tubercled spiral cords and an additional narrow one between the fourth and the fifth. Siphonal canal long. Protoconch missing. Teleoconch pure white.

Figures

Figure 90. Triforis pura E. A. Smith, 1903, Maldive Islands. A, D, E Syntype NHMUK 1903.9.17.14: front (A), aperture (D), peristome (E). B Original label. C Original figures. Scale bars: A: 1 mm; D, E: 0.5 mm.