Triforis fusca Dunker, 1860

Albano, Paolo G. & Bakker, Piet A. J., 2016, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Museum fuer Naturkunde, Berlin, with lectotype designations, Zoosystematics and Evolution 92 (1), pp. 33-78 : 53-54

Taxon classification Animalia Caenogastropoda Triphoridae

Triforis fusca Dunker, 1860 Figure 22

Triforis fusca Dunker, 1860: 237; figured in Dunker 1861: 10, plate 2, figure 22.

Type specimens.

Lectotype: ZMB/Moll no. 101922a (designated by Marshall (1983)). Paralectotype: ZMB/Moll no. 101922b. Further paralectotypes: SMF no. 304814 (Janssen, 1993).

Type locality.

Japan.

Original description.

T. testa solidula, fusca, gracili, in medio paullulum ventrosa; anfractibus 12 - 14 sutura distincta divisis, triseriatim granosis; serie intermedia angustiore obsoleta; granulis confertis ex parte confluentibus. - Alt. 10 - 11, lat. 2 mill. Alle vorliegenden Exemplare sind einfarbig dunkelbraun und in ihrer Skulptur ganz übereinstimmend.

Translation.

Solid, dark, slender shell, in the middle slightly inflated; 12-14 whorls divided by a deep suture with three rows of tubercles; the second row less developed; the granules are close on the side of the confluence [it may refer to the fact that the second row of tubercles is closer to the first row]. All specimens are monochrome dark brown of colour and the sculpture is of the same colour tone.

Diagnosis.

Lectotype height 7.6 mm. Conical shell with flat sides. Teleoconch of at least 10 whorls, with three tubercled spiral cords; the second is visible only on the eighth whorl. A fine suprasutural smooth cord is also present. The last whorl has a fourth smooth spiral cord, and the base bears two more smooth cords. The peristome has additional spiral cords among the main ones, a character well visible in the paralectotype, while the lectotype has the peristome rebuilt after breakage and its sculpture is not reliable. Apex missing in both available specimens, hence the shape and sculpture of the protoconch cannot be described. Brown in colour.