Triphoris labiatus A. Adams, 1854

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

Triphoris labiatus A. Adams, 1854

Figure 5

Triphoris labiatus Adams 1854: 279, not illustrated.

Type locality.

Sydney, Australia.

Type material.

Lectotype: NHMUK 196569, designated by Marshall (1983) (coll. H. Cuming). Paralectotypes: NHMUK 196570/1-2: 2 specimens, Sydney, Australia (coll. H. Cuming) .

Original description.

T. testâ subulato-pyramidali, nigrofuscâ, in medio tumidâ, spirâ apice obtuso; anfractibus 10, planulatis, triseriatim granulosocarinatis, suturis concavo-impressis; labro reflexo, dilatato, albido; canali brevi, subrecurvo.

Hab. Sydney, under stones, low water (Mr. Strange). Mus. Cuming.

A small, nearly black shell, with the outer lip dirty white or pale fuscous.

Translation of the Latin text.

Subulate-pyramidal shell, nearly black, swollen in the middle, obtuse apex; ten whorls nearly flat with three granulated carinas, suture concave; reflexed, swollen, whitish lip; short anterior slightly bent siphon.

Diagnosis.

Lectotype 4 mm high. Cyrtoconoid profile with flat sides. Teleoconch of nine whorls, with three spiral cords; the second cord appears on the third whorl between the other two and is initially faint but becomes as strong as the others on the penultimate whorl. Axial sculpture between the cords weak. Paralectotype A has a complete peristome (Fig. 5J ) showing no posterior sinus and additional spiral cords. The base has three weakly sculptured cords. The protoconch is paucispiral, of one whorl and a poorly distinct transition to teleoconch; the protoconchs in the type series are worn, but the lectotype one apparently bears several fine spiral threads. Shell brown, with the tubercles of the first spiral row lighter or grey.

Remarks.

The protoconch of the specimen illustrated by Marshall (1983: fig. 32C) has two whorls which bear two strong keels, while the lectotype has a single whorl and fine threads are clearly visible above the suture (Fig. 5F ).

Figures

Figure 5. Triphoris labiatus A. Adams, 1851, Sydney, Australia, coll. H. Cuming. A-I Lectotype NHMUK 196569: front (A, B), side (C, D), back (E), protoconch (F-H), aperture (I). J-L Paralectotypes, NHMUK 196570 / 1 - 2: paralectotype 1 peristome (J) and front (K), paralectotype 2 (L). M Original labels. Scale bars: A-E, K-L: 0.5 mm; F-H: 0.1 mm; I: 0.3 mm.