Triphora novapostrema Verco, 1910

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 novapostrema Verco, 1910

Figure 110

Triphora novapostrema Verco 1910: 126-127, pl. XXX, figs 1, 2.

Type locality.

"off Cape Borda" (Kangaroo Island, South Australia) (fide Marshall 1983).

Type material.

Lectotype: SAM D. 13450 (fide Marshall 1983; not seen, see Remarks) .

Additional material.

NHMUK 1911.8.12.1-2: 2 specimens (glued on cardboard), off Cape Borda, Kangaroo Island , South Australia .

Original description.

Shell immature, of eight whorls, including the protoconch of two whorls, the first nearly smooth with a round projecting apex, the second with two stout prominent keels, gradually becoming nodular. In the first spire-whorl arises a faint third spiral, posterior to the others (whence the specific name), which continuously enlarges till it nearly equals them in size. They are crossed by axial liras, about fourteen in the last whorl, both axials and spirals being well marked, the latter the stouter, and being tuberculate at their intersection. The peripheral spiral is prominent and subtuberculate, it is visible in the earlier sutures, but not in the later; two flat obsolete plaits curve round the base. Colour white.

Dim.- Length, 3.1 mm; breadth, 1.2 mm. The largest example, immature, is 5.2 mm.

Locality.- Dredged in 55 fathoms off Cape Borda, type with 7 others, some quite fresh, all immature; in Gulf St. Vincent, 1.

Diagnosis.- Its special characters are its blunt protoconch with two carinae, and the third spiral arising behind the others; in most Triphora it arises between them as in T. angasi, tasmanica, cana, etc.

Type in my collection.

Remarks.

In the original description, Verco referred to multiple specimens in the type series. Marshall’s (1983) report of the “holotype” in the SAM should be considered a lectotype designation according to Article 74.6 of the Code ( ICZN 1999). The two NHMUK shells come from the type locality. However, neither the label nor the register entry states that they are co-types. Their type status is uncertain.

Figures

Figure 110. Triphora novapostrema Verco, 1910, off Cape Borda, South Australia. A, K Original figures. B-E, N, O NHMUK 1911.8.12.1: front (B, C), side (D, E), protoconch (N, O). F-J, L, M NHMUK 1911.8.12.2: front (F, G), side (H, I), back (J), protoconch (L, M). P. Original labels. Scale bars: B-E: 0.5 mm; F-J: 1 mm; L-O: 0.2 mm.