Triphoris (Mastonia) clemens Hinds, 1843

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

Triphoris (Mastonia) clemens Hinds, 1843

Figure 24

Triphoris (Mastonia) clemens Hinds 1843b: 20, not illustrated. Illustration available in Hinds (1844): 30, pl. 8, fig. 16.

Type locality.

Straits of Malacca.

Type material.

Syntypes: NHMUK 196540: 1 specimen, Straits of Malacca (H. Cuming coll.) .

Original description.

Testa cornea nitenti; anfractibus quindecim triseriatim granulosis; serie media parva ad inferiorem appropinquante; inferiore prominulo-margaritacea; anfractus ultimi granulis parvis; sutura sulcata; apertura rotunda; sinu laterali patulo. Axis 3 lin.

Geog. Straits of Malacca; from 20 fathoms, mud.

Translation of the Latin text.

Bright brown shell; fifteen whorls with three series of granules; the small intermediate one closer to the lower which is pearly grey; last whorls with small granules; grooved suture; rounded aperture; open posterior sinus. Height 3 lines.

Diagnosis.

Syntype 5.7 mm high. Shell conical with flat sides. The teleoconch has 12 flat whorls ornamented by three spiral cords with large rounded tubercles at the interstices with prosocline axial ribs. The second cord appears on the seventh whorl and is initially very narrow. A fourth suprasutural smooth cord is present which develops into a fully tuberculated cord on the last whorl. The base has two more tuberculated cords. Fine spiral threads are also visible among the main cords. The peristome is incomplete in the holotype hindering its description. Siphonal canal short. In the holotype, the protoconch is incomplete but clearly multispiral. Three whorls are visible and ornamented by two strong spiral keels and several equally strong axial riblets. The teleoconch has a whitish background with pearly tubercles and orange interstices. Protoconch brown.

Figures

Figure 24. Triphoris clemens Hinds, 1843, Straits of Malacca, coll. H. Cuming. A-I Syntype NHMUK 196540: front (B, C), side (A, D), back (E), microsculpture (F), peristome (G), protoconch (H), original labels (I). J Figure in Hinds 1844. Scale bars: A-E: 1 mm; F, G: 0.5 mm; H: 0.1 mm.