Triforis (Mastonia) loyaltyensis 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 : 43

Triforis (Mastonia) loyaltyensis Hervier, 1898 ( Fig. 22 )

Triforis (Mastonia) loyaltyensis Hervier, 1898: 256 , illustrated by Hervier (1899: pl. 16, fig. 6).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-1502; 2 specimens; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongato-conica, turgidula, apice acuminata, solidula, nitida, alba, roseo tincta, luteo cingulata . Anfractus 13-15: embryonales 3 violacei, carinati, striis verticalibus decussati, intermedii angusti, lentè accrescentes; subembryonales 5-6 bilirati, liris juxtà suturas sitis, gemmiferis, interstitiis verticaliter costulatis, sutura profunda discreti; inferiores trilirati, intermedia lira paululùm minore, liris et costulis ferè aequidistantibus decussati, in intersectione granosi. Ultimus anfractus convexus, basi rotundus, sexliratus, liris gemmiferis, ultimis 2 exilibus. Canalis brevissimus, apertus, obliquè recurvus. Apertura parva , obliquè ovata, superne angulata et lateraliter fissa. Columella concava. Labrum arcuatum, prominens, acutum, sub sutura internè canaliculatum, infernè ad canalem basalem columellae quasi junctum. Sinus aperturalis parvulus, rotundus, in canali suturali interno effossus. — Long. 5-6 mill.; diam. max. 1.75-2 mill.

Hab. Insula Lifou. Vidi 5 specimina, à R. P, Goubin, S. M., collecta.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, elongated and conical, slightly broad, acute apex, rather solid, bright, white, pink coloured, with yellow spiral cords. Whorls from 13 to 15: embryonic whorls are three, purplish, carinated, crossed by vertical striae, intermediate whorls are narrow, slowly growing; semi-embryonic whorls are from five to six, separated by a deep suture, they are characterised by two spiral cords, these are close to the suture and tubercled, interspaces are vertically costulate; inferior whorls with three spiral cords, intermediate spiral cord is slightly smaller, cords and ribs are more or less equally crossed, granulated on the interspaces.Last whorl is convex, rounded at the base, with six tubercled spiral cords, the last two cords are thin. Siphon is very short, open, obliquely curved. Aperture is small, obliquely ovate, angled above and laterally fissured. Columella is concave. Lip is arched, protruding, acute, internally canaliculated below the suture, below almost attached to the basal channel of the columella. Sinus of the aperture is small, rounded, carved inside the suture. — Length 5-6 mm; maximum diameter 1.75-2 mm.

Locality: Lifou Island. I saw 5 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell conical with flat sides. Illustrated syntype 5.1 mm high.Teleoconch of 10 whorls. Three spiral cords present, the second appearing on the sixth whorl. First and third cords with tubercles at the intersection with rather orthocline axial ribs. Second cord initially with thin tubercles, becoming larger on the lower whorls. Spiral microsculpture of several fine spiral threads between the main cords. Peristome without additional cords. Posterior sinus shallow. Base with three additional spiral cords of which the first with tubercles, the second with flat tubercles and the third smooth. Protoconch broken in the illustrated syntype, but possibly multispiral with two strong spiral keels and several strong axial riblets. Teleoconch pink with the first cord orange to brown. Base light brown with orange first cord and siphonal canal. Protoconch whitish to pinkish.

Figures

FIG. 22. — (Mastonia) loyaltyensis Hervier,1898, Lifou,New Caledonia: A, original figure in Hervier (1898); B-K, syntype 1, MNHN-IM-2000-1502; front (B, C), side (D, E), back (F), protoconch (G, H), microsculpture (I), peristome (J, K); L, syntype 2, MNHN-IM-2000-1502; front; M, N, original labels. Scale bars: B-F, L, 1 mm; G-I, 0.2 mm; J, K, 0.5 mm.