Triforis (Iniforis) formosula Hervier, 1898

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 : 34

Triforis (Iniforis) formosula Hervier, 1898 ( Fig. 15 )

Triforis (Iniforis) formosula Hervier, 1898: 251 , illustrated by Hervier (1899: pl. 15, figs 5-5a).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-1245; 1 specimen; from type locality .

ORIGINAL DESCRIPTION. — T. sinistrorsa , parvula, elongato-turgidula, apice acuminata, nitidè alba, pallidè fulvescens in anfractibus inferioribus, inter granula interruptè fulvo picta. Anfractus circa 15 (apice fracto) subconvexi, sutura profunda, lineari, crassiuscula, discreti, liris duabus gemmiferis ornatis; liris aequalibus, intervallo concavo, ferè aequidistantibus; gemmis sphaericis, eminentibus. Ultimus anfractus convexus, quinqueliratus, liris 3 prioribus granuliferis, interpictis. Canalis basalis brevis, obliquus, valdè recurvus, omninò clausus. Apertura subcircularis; peristoma continuum; columella arcuata; labrum tenue, semicirculare, ad basin cum columella angulosè junctum, notabiliter prodiens, juxtà suturam, propè aperturam, secundum orificium semirotundum, subtubulare (marginibus erectis) parens. Long. 4 mill.; diam. max. 1.50 mill.

Hab. Insula Lifou. Vidi 2 specimina, à R. P. Goubin, S. M., collecta.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, small, broadelongated, acute apex, bright white, the inferior whorls are light brownish, discontinuously coloured in brown between the granules. About 15 slightly convex whorls (broken apex), separated by a deep linear and quite large suture and adorned by two tubercled spiral cords; cords are equal, with convex interspaces, equally distant; tubercles are spherical and protruding. Convex last whorl, with five spiral cords, the first three cords bear granules, coloured in-between. Short siphon, oblique, strongly curved, completely closed. Slightly rounded aperture, continuous peristome; arched columella; tenuous lip, semi-circular, making an angle at the base with the columella, markedly protruding, the posterior siphonal canal appears below the suture and near the aperture. Length 4 mm; maximum diameter 1.50 mm.

Locality: Lifou Island. I saw 2 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell conical with flat sides. Syntype 3.7 mm high. Teleoconch of c. 8 whorls. Three spiral cords present, the second appearing on the last whorl. First and third cords with tubercles at the intersections with prosocline axial ribs. Second cord as a fine thread. Spiral microsculpture of barely visible smooth fine threads. Peristome with two obsolete additional cords. Siphonal sinus deep. Base with three additional cords of which the first tubercled and the others smooth. Paucispiral protoconch of c. 2 whorls with one row of strong tubercles. First three teleoconch whorls white, then yellowish to brownish with brown interspaces between the tubercles. Protoconch white.

Figures

FIG. 15. — Triforis (Iniforis) formosula Hervier, 1898, Lifou, New Caledonia: A, K, original figures in Hervier (1898); B-I, L, M, syntype, MNHN-IM-2000-1245; front (B, C), side (D, E), back (F), protoconch (G, H), microsculpture (I), peristome (L, M); J, N, original labels. Scale bars: B-F, 0.5 mm; G-I, L, M, 0.2 mm.