Triphoris (Mastonia) tristis 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) tristis Hinds, 1843

Figure 38

Triphoris (Mastonia) tristis Hinds 1843b: 20, not illustrated.

Type locality.

Not reported.

Type material.

Syntypes: NHMUK 196538: 1 specimen, and NHMUK 196539: 1 fragment (but likely conspecific), both without locality (J.E. Gray coll.) .

Original description.

Testa ovali elongata, ferruginea; anfractibus tridecim biseriatim granulosis; serie superiori paululum maxima et albida; anfractu penultimo serie tertia minima. Axis 3 lin.

Geog. -? Cab. Gray.

Translation of the Latin text.

Shell oval and elongated, reddish; 13 whorls with two granulated cords; the upper one slightly larger and white; on the penultimate whorl a small third cord appears. Height 3 lines.

Diagnosis.

Syntype NHMUK 196538 6.2 mm high. Shell conical, composed of 13 teleoconch flat whorls which bear two main tuberculated spiral cords. A third develops in between on the penultimate whorl as a fine thread but attains full size on the last whorl. The base has two additional weakly tuberculated whorls. The apex is broken in the lectotype, but remnants of the last protoconch whorl suggest a multispiral type. Such last whorl bears a single strong spiral keel and axial riblets. Shell brown, with pearly white tubercles on the first spiral cord.

Figures

Figure 38. Triphoris tristis Hinds, 1843, unknown locality, J. E. Gray coll. A-H Syntype NHMUK 196538: front (A, B), side (C), back (D), original labels (E), protoconch (F, G), aperture (H). Scale bars: A-D: 1 mm; F, G: 0.1 mm; H: 0.5 mm.