Triphoris angustissimus 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 : 16

Triphoris angustissimus Deshayes, 1863 ( Fig. 2 )

Triphoris angustissimus Deshayes, 1863: 104 , pl. 12, figs 1, 2.

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

TYPE MATERIAL. — Neotype. Reunion Island • MNHN-IM-2000-9488; designated by Jay (2007).

ADDITIONAL MATERIAL. — Reunion Island •MNHN-IM-2012-36195; 10 specimens; La Réunion (coll. M. Jay) .

ORIGINAL DESCRIPTION. — T. testa minima elongato-turrita, angustissima, regulariter conica, apice acuminata, nitidissima, albida, fusco inaequaliter marmorata; anfractibus quatuordecimis, planis, angustis, lentissime crescentibus, duplici ordine margaritarum ornatis; ultimo anfractu brevi, ad peripheriam angulato, basi plano; apertura ovatorotunda, canali brevissimo terminata.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Small elongated and turreted shell, very narrow, regularly conical, with a sharp apex, bright, white and irregularly dark marbled; fourteen whorls, flattened, narrow, slowly growing, with two series of granules; short last whorl, angled at the periphery with a flat base; oval and rounded aperture, ending with a very short siphon.

DIAGNOSIS. — Shell very elongated with flat sides. Neotype 5.6 mm high.Teleonconch of 13 whorls. Two spiral cords present, the lower being more prominent. Cords with strong tubercles at the intersection with slightly prosocline axial ribs. Microsculpture of very fine spiral and axial threads crossing each other, giving a reticulate pattern. Peristome with an additional cord barely visible between the first and second cord. Posterior sinus deep. Base with two additional smooth spiral cords; the first weakly granulated towards the peristome. Paucispiral protoconch of c. 3 strongly angulated whorls bearing large tubercles along the spiral keel and near the sutures. First whorl of the teleoconch white to light yellowish, then bearing large yellow to brown blotches; tubercles generally lighter. Columella and siphonal canal brown.

REMARK. — Neotype illustrated in colour in Jay (2007).

Figures

FIG. 2. — Triphoris angustissimus Deshayes,1863, La Réunion:A, original figure in Deshayes (1863);B-F, Neotype MNHN-IM-2000-9488; front (B), side (C), protoconch (D), peristome (E), teleoconch microsculpture (F); G-P, MNHN-IM-2012-36195 (coll. M. Jay):front (G, H), side (I, J), back (K), protoconch (L, M), peristome (N, O), teleoconch microsculpture (P). Scale bars: B, C, G-K, 1 mm; D-F, L, M, P, 0.2 mm; N, O, 0.5 mm.