Triforis atlantica E.A. Smith, 1890

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

Triforis atlantica E.A. Smith, 1890

Figure 80

Triforis atlantica Smith 1890: 292, pl. 21, fig. 26.

Type locality.

Saint Helena.

Type material.

Lectotype: NHMUK 1889.10.1.1374, designated by Rolán and Fernández-Garcés 2008). Paralectotypes: NHMUK 1889.10.1.1375-93, 18 specimens (two gold coated) .

Original description.

Testa haud perelongata, alba, livido-fusco inferne zonata; anfractus 13, anguste turriti, supremi minute cancellati, cateri plani, granulorum seriebus duobus vel tribus cincti, ultimus seriebus quinque, infima minus tuberculata, ornatus; cauda brevis, carina valida instructa, fuscescens; apertura obliqua, ovata, superne canaliculata; peristoma superne leviter incisum, inferne columellae callo crasso junctum.

Longit. 6 millim., diam. 2

The outlines of this species are a little convex. Only the penultimate and antepenultimate whorls have three distinct rows of granules, and of those the central one is the smallest. The granules of the lowermost series, or rather the interstices between them, are brown and the uppermost series is white.

Translation of the Latin text.

Not very elongated shell, white, inferiorly with a dark brown zone; 13 whorls narrowly turreted, the uppermost minutely cancellated, the other flat with two or three rows of granules, five on the last with the lowest sligtly tuberculated; anterior siphon short, with a strong brownish carina; oblique aperture, ovate, canaliculated above; slightly incised peristome in its upper part, joined below with the large columellar callus.

Height 6 mm, diameter 2 mm.

Diagnosis.

Lectotype 4.5 mm high. Shell conical, with flat sides. Teleoconch of nine whorls (but apex missing) with two main spiral cords with tubercles at the intersection with prosocline axial ribs; a third cord develops in between at mid-shell height and attains full size only on the last whorl. Peristome broken and regrown in the lectotype; siphonal canal short. Base with two additional weakly tubercled cords and a smooth third. Protoconch absent in the lectotype, but reported to be multispiral ( Rolán and Fernández-Garcés 2008). The first teleoconch whorls are white; the following with a white first and brown second spiral cord (with lighter tubercles). Base brown.

Remarks.

Rolán and Fernández-Garcés (2008) erroneously reported the inventory numbers as 1889.10.1.1874-93.

Figures

Figure 80. Triphoris atlantica E. A. Smith, 1890, Saint Helena. A-F Lectotype NHMUK 1889.10.1.1374: front (A, B), side (C, D), back (E), aperture (F). G Original labels. H Original figure. Scale bar: A-F: 0.5 mm.