Triforis (Mastonia) papillata 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 : 50

Triforis (Mastonia) papillata Hervier, 1898 ( Fig. 28 )

Triforis (Mastonia) papillata Hervier, 1898: 259 , illustrated by Hervier (1899: pl. 17, fig. 2).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-1505; 2 specimens; from type locality .

ORIGINAL DESCRIPTION. — T. sinistrorsa , ovato-elongata, obesa, latere convexa, apice acuminata, solida, alba, brunneo interlirata, basi violacea. Anfractus circa 15, sutura indistincta, lineari, undulata discreti, liris gemmiferis 2 juxtà suturas ornati. Gemmae validae, subaequales, alternae. Interstitia concava, suturae sulcis latiora, striis incrementi et lirulis transversim minutissimè decussata, bruneo-violaceo tincta. Ultimus anfractus convexus, brevis, 5 liris gemmiferis, decrescentibus cingulatus, omninò pallidè violaceo coloratus, ad ortum canalis coarctatus. Canalis basalis brevis, contortus, pluriliratus, valde recurvus, semiclausus. Apertura parvula, subquadrata, intùs violacea. Peristoma continuum; columella angulata, supernè planata, lateraliter crassè cristata. Labrum subarcuatum, ad ortum canalis columellae cohaerens, supernè breviter et rotundè ad suturam fissuratum. — Long. 7-9 mill.; diam. max. 2.50-3 mill.

Hab. Insula Lifou. Vidi 10 specimina, à H. P. Goubin, S. M., collecta.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, ovate-elongated, broad, laterally convex, acute apex, solid, white, with brownish spiral cords and purple base. About 15 whorls, separated by an indistinct, linear and waved suture, adorned by two tubercled spiral cords near the suture. Gemmae are alternately thick and slightly equal. Concave interspaces, wider than the suture, minutely crossed by growth lines and transversal small cords, brown-violet in colour. Convex last whorl, short, with five decreasing tubercled spiral cords, completely coloured in light purple, narrow near the siphon. Short siphon, convoluted, with multiple spiral cords, strongly curved, partly closed. Small aperture, squarish, internally purple. Continuous peristome; Angled columella, flattened above, laterally densely crested. Slightly arched lip, adjacent to the columellar channel, above shortly and roundly fissured near the suture. — Length 7-9 mm; maximum diameter 2.50-3 mm.

Locality: Lifou Island. I saw 10 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell cyrtoconoid. Syntypes 5.1 and 5.2 mm high. Teleoconch of c. 7 whorls. Two spiral cords present, with a spiral thread on the last whorl just below the first spiral cord. Spiral cords with rather large tubercles. Spiral microsculpture of weakly granulated fine threads between the spiral cords. Base with two additional cords initially smooth and then developing thin tubercles. Teleoconch white to pink with dark brown interspace between the spiral cords. Protoconch missing in the syntypes.

Figures

FIG. 28. — Triforis (Mastonia) papillata Hervier, 1898, Lifou, New Caledonia: A, original figure in Hervier (1898); B-I, syntypes 1, MNHN-IM-2000-1505; front (B, C), side (D, E), back (F), peristome (G, H), microsculpture (I); J, Syntype 2, MNHN-IM-2000-1505; front; K, L, original labels. Scale bars: B-F, J, 1 mm; G-I, 0.4 mm.