Triforis (Mastonia) troglodytes 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 : 55

Triforis (Mastonia) troglodytes Hervier, 1898 ( Fig. 32 )

Triforis (Mastonia) troglodytes Hervier, 1898: 263 , illustrated by Hervier (1899: pl. 17, fig. 8).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-1506; 2 specimens; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , minuta, ovata, obesula , apice acuminata, solida, luteo-cornea, inter gemmas rufo picta. Anfractus 10-12: embryonales 4 cornei, carinati, striatuli; intermedii sutura canaliculata discreti, longitudinaliter costulati, costulis rotundis, transversim liris duabus, elevato-planatis, gemmiferis interruptè rufo pictis decussati; gemmae elongatae, distantes, nitidè corneolae. Ultimus anfractus plano-convexus, circa basin depressus, 6 liris gemmiferis minoribus ornatus . Canalis brevissimus, carinatus, apertus, obliquè recurvus. Apertura obliquata, piriformis, lateraliter ad suturam fissurata. Columella arcuata. Labrum inferius subrotundum, in aperturam prominens, latere planatum, ad suturam angulòse columellae junctum, in angulo sinu parvulo, rotundo munitum. — Long. 2.50-3 mill.; diam. max. 1.50 mill.

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

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, small, ovate, broad, acute apex, solid, yellow-brownish, coloured in red between tubercles. From 10 to 12 whorls: four brown embryonic whorls, carinated, striated; intermediate whorls are separated by a canaliculated suture, longitudinally costulate, ribs are rounded, with two spiral cords, elevated-flattened, tubercled and crossed with red interspaces between the tubercles; elongated tubercles, distant, brightly corneous. The last whorl is flattened and convex, depressed near the base, adorned by six smaller tubercled spiral cords. Very short siphon, carinated, open, obliquely curved. Oblique aperture, pyriform, laterally fissured near the suture. Arched columella. Slightly rounded inferior lip, protruding on the aperture, laterally flattened, angled near the suture and attached to the columella, with a small and rounded sinus at the angle. — Length 2.50-3 mm; maximum diameter 1.50 mm. Locality: Lifou Island. I saw 10 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell pupoid. Illustrated syntype 2.4 mm high. Teleoconch of c. 6 whorls. Three spiral cords present, the second appearing only on the last whorl. First and third cords with tubercles at the intersection with rather orthocline axial ribs. Second cord initially with thin tubercles becoming larger towards the peristome. Base with two tubercled additional spiral cords. Teleoconch white with the interspaces between the tubercles of the spiral cords brown. Protoconch missing in the syntypes.

Figures

FIG. 32. — Triforis (Mastonia) troglodytes Hervier, 1898, Lifou, New Caledonia: A, original figure in Hervier (1898); B-I, syntype, MNHN-IM-2000-1506; front (B, C), side (D, E), back (F), apex (G, H), microsculpture (I); J, K, original labels. Scale bars: B-F, 0.5 mm; G, H, 0.2 mm; I, 0.1 mm.