Triphora retusa Turton, 1932

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

Triphora retusa Turton, 1932

Figure 103

Triphora retusa Turton 1932: 117, pl. XXV, fig. 855.

Type locality.

Port Alfred, South Africa.

Type material.

OUMNH: lost.

Additional material.

NHMUK 1933.9.4.37: 1 specimen, Port Alfred , South Africa (coll. W.H. Turton) .

Original description.

The shape is broadly conic; 1 very small nuclear whorl, with 5 others nearly straight; aperture large, nearly circular, and rather projecting; apex very blunt. The surface is covered with 3 rows of tubercles on each whorl. The colour is yellowish brown; and the size 2 × 1 mm. Characteristics. A little shell near [Triphora] sabita but smaller, more broadly conic, with a much blunter apex, and more projecting aperture. Though so small it seems to be full-grown, as I found about a dozen specimens, the type being the largest.

Diagnosis.

Specimen 1.1 mm high, but it is clearly a juvenile with just three post-metamorphic whorls, which bear two spiral cords with granules at the intersection with faint orthocline axial ribs. Paucispiral protoconch of one whorl, apparently smooth, but very worn. Shell brown in colour.

Figures

Figure 103. Triphora retusa Turton, 1932, Port Alfred, South Africa. A, B NHMUK 1933.9.4.37. C Original labels. D Original figure. Scale bar: A, B: 0.3 mm.