Triphoris (Ino) bilix 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 (Ino) bilix Hinds, 1843

Figure 20

Triphoris (Ino) bilix Hinds 1843b: 17, not illustrated. Illustration available in Hinds (1844): 28, pl. 8, fig. 5.

Type locality.

Straits of Malacca.

Type material.

Syntypes: NHMUK 1879.2.26.206: 3 specimens, Straits of Malacca (coll. T. Lombe Taylor) .

Original description.

Testa attenuata pallida; anfractibus quindecim tricarinatis; carina inferiore paululum maxima marmorata, media minima; apertura rotundata; sinu laterali patulo. Axis 3 lin.

Geog. Straits of Malacca; dredged from a muddy bottom in 20 fathoms.

Translation of the Latin text.

Slender pale shell; fifteen whorls with three spiral cords; the lower carina is marbled and a little bit more developed, the intermediate is the smallest; mouth rounded; open posterior sinus. Height 3 lines.

Diagnosis.

Syntypes ranging in size from 6.7 to 7.5 mm. Teleoconch cyrtoconoid, with flat whorls. Syntype 1 (Fig. 20A-F ) teleoconch of 12 whorls, ornamented by three undulated spiral keels; the second being narrower and appearing on the fourth teleoconch whorl. A fourth fine smooth suprasutural cord is visible in the lower part of the shell. Axial prosocline fine growth lines are visible especially on the lower part of the teleoconch. On the last whorl, keels become tuberculated and the profile becomes angulated. The peristome shows an additional tuberculated spiral keel. Siphonal canal quite long. Base flat with an additional smooth spiral cord. Protoconch of six whorls: protoconch I of two apparently smooth whorls, but the preservation of this part of the shell is suboptimal. Protoconch II of four whorls with one spiral keel on the first two, and two on the last two; axial riblets are visible on all four whorls. The protoconch is brown, whereas the teleoconch has a creamy white background colour with orange blotches. The interspaces between the tubercules of the third keel are often orange-brown.

Figures

Figure 20. Triphoris bilix Hinds, 1843, Straits of Malacca, coll. T. Lombe Taylor. A-F, J, L Syntype NHMUK 1879.2.26.206 / 1: front (A, B), side (C), back (D), protoconch (E, F), microsculpture (J), peristome (L). G-I Syntype NHMUK 1879.2.26.206 / 2: front (G), side (H), back (I). K Original labels. M Figure in Hinds 1844. Scale bars: A-D, G-I: 1 mm; E, F, J, L: 0.2 mm.