Triphoris (Mastonia) monilifer 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) monilifer Hinds, 1843

Figure 33

Triphoris (Mastonia) monilifer Hinds 1843b: 19, not illustrated. Illustration available in Hinds (1844): 30, pl. 8, fig. 14.

Type locality.

Straits of Malacca.

Type material.

Syntypes: NHMUK 1879.2.26.208: 3 specimens, Straits of Malacca (coll. T. Lombe Taylor) ; NHMUK 1844.6.7.28-29, 2 specimens, Straits of Malacca (coll. E. Belcher) .

Original description.

Testa parva, elegantissime monili; anfractibus decem biseriatim granulosis; granulis seriei inferioris albis intervallis rubris, supremae albis; apertura subquadrata, sinu laterali angusto. Axis 2⅓ lin.

Geog. Straits of Malacca; in 18 to 23 fathoms, mud. The manner in which the lower series of markings is repeated in the last whorl is very evident in this species, though to be met with in nearly the whole. Thus, the series of beading, which is single on the upper whorls, will here be found to be double on the last.

Translation of the Latin text.

Small shell, elegant like a jewel; ten whorls with two series of granules; the lower series with white granules with red interspaces, the upper one white; subquadrate aperture, narrow posterior sinus. Height 2⅓ lines.

Diagnosis.

Syntype NHMUK 1879.2.26.208/1 (Fig. 33A-G ) 4.4 mm high. Shell conical and rather broad. Teleoconch of nine whorls with two main spiral cords bearing tubercles at the intersection with prosocline axial ribs. A fine third cord develops on the last whorl and numerous fine punctuated spiral striae are present between the main cords. A fourth and fifth smooth spiral cords are visible on the base. The peristome bears a deep posterior sinus and additional spiral cords near the lip. Anterior siphonal canal short. Protoconch multispiral of 5 whorls. The first is apparently smooth, while the others bear a strong spiral keel and axial riblets. Protoconch brown. Teleoconch with a creamy white background and orange interspaces between tubercles.

Figures

Figure 33. Triphoris monilifer Hinds, 1843, Straits of Malacca, coll. T. Lombe Taylor. A-G Syntype NHMUK 1879.2.26.208 / 1: front (A, B), side (C, D), back (E), protoconch (F, G). H-K Syntype NHMUK 1879.2.26.208 / 2: front (H, I), peristome (J, K). L Figure in Hinds 1844. M-N Original labels of lot 1879.2.26.208. Scale bars: A-E, H-K: 0.5 mm; F, G: 0.1 mm.