Triforis (Mastonia) ustulata 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 : 59

Triforis (Mastonia) ustulata Hervier, 1898 ( Fig. 34 )

Triforis (Mastonia) ustulata Hervier, 1898: 260 , illustrated by Hervier (1899: pl. 17, fig. 4).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-1507; 2 specimens; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongato-turrita, obesula , latere convexa, apice acuminata, solida, nitidè aurantiaca, albo-zonata, circa basin et prope apicem ustulato-rufo cingulata . Anfractus 13-15: embryonales 4 cornei, unicarinati, striatuli; intermedii sutura lineari, indistincta discreti, gemmis aequalibus biseriatim ornati (serie prima aurantiaca, serie inferiore alba), sulco subprofundo separatis, intertitiis sub lente minutissimè striatulis. Ultimus anfractus convexus, liris 4 gemmiferis, decrescentibus cinctus (3 inferioribus ustulato-rufo tinctis), ad ortum canalis breviter coarctatus. Canalis basalis brevis, unicarinatus, obliquus, valdè recurvus,semiclausus. Apertura parvula, obliqué piriformis. Peristoma continuum. Columella flexuosè arcuata, ad ortum canalis callositate munita; labrum arcuatum, oblique directum, infernè canali cohaerens, supernè lateraliter fissuratum. — Long. 4.25-5.50 mill.; diam. max. 1.75-2.25 mill.

Hab. Insula Lifou. Vidi 8 specimina, à R. P. Goubin, S. M., collecta.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, turretedelongated, broad, laterally convex, acute apex, solid, bright orange, with white bands, with brownish-red spiral cords near the base and the apex. From 13 to 15 whorls: four corneous embryonic whorls, unicarinated, striated; intermediate whorls separated by a linear and indistinct suture, with two series of spiral cords adorned by equal tubercles (first series is orange, the inferior one is white), separated by a deep groove, interspaces are minutely striated. The last whorl is convex, with four decreasing tubercled spiral cords, (three inferior cords are coloured in brownish-red), shortly narrow near the siphon. Short siphon, unicarinated, oblique, strongly curved, partly closed. Small aperture, obliquely pyriform. Continuous peristome. Sinuously arched columella, with a callus near the siphon; arched lip, obliquely directed, below attached to the siphon, above laterally fissured. — Length 4.25-5.50 m; maximum diameter 1.75-2.25 mm. Locality: Lifou Island. I saw 8 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell conical with flat sides. Syntypes 3.3 and 5.5 mm high. Teleoconch of 7-8 whorls. Two spiral cords present and with tubercles at the intersection with rather prosocline axial ribs. Spiral microsculpture of finely granulate threads. Peristome with an additional cord below the first. Base with three cords of which the first developing flat tubercles and the other two smooth. Multispiral protoconch of 5 whorls with one strong spiral keel and axial riblets. First 1.5-2 teleoconch whorls white, other whorls yellowish. Second spiral cord brown on the third, fourth and last teleoconch whorl, but white on the sixth whorl, then again brown on the last whorl. First cord on the base brown. Protoconch brown.

Figures

FIG. 34. — Triforis (Mastonia) ustulata Hervier, 1898, Lifou, New Caledonia: A, original figure in Hervier (1898); B-K, syntype 1, MNHN-IM-2000-1507; front (B, C), side (D, E), back (F), protoconch (G, H), microsculpture (I), peristome (J, K); L-N, syntype 2, MNHN-IM-2000-1507; front (L), side (M), back (N); O, P, original labels. Scale bars: B-F, 0.5 mm; G-I, 0.2 mm; J, K, 0.4 mm; L-N, 1 mm.