Triphoris formosus Deshayes, 1863

Albano, Paolo G., Franco, Davide Di, Azzarone, Michele, J., Piet A., Bakker & Sabelli, Bruno, 2023, Review of the types of Indo-Pacific Triphoridae (Mollusca, Gastropoda) in the Muséum national d’Histoire naturelle, Paris, Zoosystema 45 (2), pp. 13-106 : 19-22

Triphoris formosus Deshayes, 1863

( Fig. 5 )

Triphoris formosus Deshayes, 1863: 102 , pl. 11, figs 29.

TYPE LOCALITY. — Cap La Houssaye, Saint Paul, La Réunion.

TYPE MATERIAL. — Neotype. Reunion Island • MNHN-IM-2000-9487; designated by Jay (2007).

ADDITIONAL MATERIAL. — Reunion Island • MNHN-IM-2012-36193; 3 specimens; from type locality (coll. M. Jay).

ORIGINAL DESCRIPTION. — T. testa elongato-turrita , subulata , pallide violacea; anfractibus quindecimis, planis, conjunctis, sutura canaliculata distinctis, duplici ordine granulorum ornatis, granulis aequalibus, albidis ornatis; ultimo anfractu brevi, coarctato, trifariam granuloso; apertura circulari, labro lateraliter profunde fisso.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Elongated and turreted shell, subulate, light violet; fifteen flat contiguous whorls, adorned by two spiral cords of light coloured and equal granules, channelled and distinct suture; short last whorl, narrow, with three granulated spiral cords; rounded aperture, lip laterally deeply fissured.

DIAGNOSIS. — Shell conical with flat sides. Teleonconch of 12 whorls. Neotype 6.1 mm high. Two spiral cords present bearing prominent tubercles at the intersection with slightly prosocline axial ribs. A fine spiral thread appearing only on the last whorl under the first cord. Microsculpture of numerous pustulose spiral threads in interspaces. Peristome without additional cords. Posterior sinus well developed and protruding as a very short canal. Base with two additional spiral cords of which the first becomes granulated near the lip and the second smooth. Paucispiral protoconch of c. 2 whorls with one strong spiral keel and low axial riblets. Upper part of the teleoconch pinkish, lower half of the teleoconch pink to light brown with darker interspaces between tubercles on the lower whorls. Protoconch pinkish.

REMARK. — Neotype illustrated in colour in Jay (2007). Lot MNHN-IM-2012-36193 contains a fourth specimen that is distinctly different from T. formosus and certainly belongs to another species.

Figures

FIG. 5. — Triphoris formosus Deshayes, 1863, La Réunion: A, original figure in Deshayes (1863); B-K, MNHN-IM-2012-36193 (coll. M. Jay): front (B, C), side (D, E), back (F), peristome (G, H), protoconch (I, J), teleoconch microsculpture (K); L-O, Neotype MNHN-IM-2000-9487; front (L), side (M), protoconch (N), peristome (O). Scale bars: B-F, L, M, 1 mm; G-K, 0.4 mm; N, O, 0.2 mm.