Trifora cerea E.A. Smith, 1906

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

Trifora cerea E.A. Smith, 1906

Figure 83

Trifora cerea E.A. Smith 1906: 43, pl. 7, figs 11, 11a.

Type locality.

Port Shepstone, Natal, South Africa.

Type material.

Syntypes: NHMUK 1906.6.23.13: 1 specimen, South Africa .

Original description.

Testa subulata, flavescens, nitida; anfractus 14 (?), convexi, costis spiralibus tuberculatis quatuor cincti, duobus medianis caeteris majoribus, inter costas oblique costulati, ultimus costis sex instructus, duobus inferioribus vix tuberculatis; columella supra arcuata, callo albo crassiusculo induta; canalis brevis, obliquus, recurvus, haud clausus; labrum subpatulum, extremitatibus costarum leviter dentatum.

Longit. 10.5 mm., diam. 2.25. Apertura 1.25 longa.

Hab. -Port Shepstone (Burnup).

Of a uniform yellow wax colour, ornamented with four rows of granules on each whorl, the lowest row being the smallest, and the two central series rather more prominent than the uppermost row.

Translation of the Latin text.

Subulate shell, yellowish, bright; 14 (?) whorls, convex, encircled by four tuberculated spiral cords, the greater two in the middle, costulated obliquely between cords; last with six cords, the two lower ones barely tuberculated; columella arched above, covered by a rather large callus; short anterior siphon, slanting, curved, not closed; extended lip, slightly dentate at the end of the cords.

Height, 10.5 mm, diameter 2.25. Aperture length 1.25 mm.

Diagnosis.

Syntype 7.1 mm high (but apical part missing). Shell conical with slightly convex sides. Teleoconch with at least nine whorls bearing three spiral cords with tubercles at the intersection with slightly prosocline axial ribs. The second cord is less pronounced in the first whorl of the type specimen, suggesting that the second cord develops later than the others. A fourth smooth spiral cord is visible suprasuturally. Peristome showing a faint additional spiral cord between the second and the third, but too worn to enable the description of the posterior sinus. Siphonal canal short. The fourth spiral cord is smooth on the base, which bears a fifth, again smooth, cord. The periphery of the last whorl is quite angulated. Protoconch absent in the syntype. Teleoconch yellow to light orange.

Remarks.

The date of publication of this paper follows Trew (1993).

Figures

Figure 83. Trifora cerea E. A. Smith, 1906, South Africa. A-E, G, J Syntype NHMUK 1906.6.23.13: front (A, B), side (C, D), back (E), peristome (G), aperture (J). F Original figures. H Original box. I Original label. Scale bars: A-E: 1 mm; G, J: 0.5 mm.