Triforis (Inella) montrouzieri 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 (Inella) montrouzieri Hervier, 1898 ( Fig. 27 )

Triforis (Inella) montrouzieri Hervier, 1898: 253 , illustrated by Hervier (1899: pl. 16, figs 1-1a).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-1504; 2 specimens; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongato-turrita, subulata , apice acuminata, solidula, nitida, luteo-fusca, violaceo cingulata . Anfractus 15-18: embryonales 3 violacei, carinati, striatuli; intermedii subplani, sutura crassiuscula, undulata, subprofunda discreti, transversim biseriatim in superioribus anfractibus, triseriatim in inferioribus lirati, liris gemmiferis, aequalibus, in eodem anfractu aequidistantibus (gemmis subsphaericis); longitudinaliter costulati, in lirarum interstitiis transversim minutissimè striatuli, quandoque laevigati. Ultimus anfractus ad basin depressus, circa canalem coarctatus et subplanatus, 6-7 liris gemmiferis (3-4 ultimis minoribus) ornatus . Apertura obliquè subrotunda, ad insertionem labri suprà et infrà ad canalem angulosa, lateraliter fissa. Columella arcuata. Labrum ad canalem depressum, infrà suturam planatum, medio semicirculare, obliquè prominens, sub sutura internè canaliculatum, inferius (ad ortum canalis) columellae quasi junctum. Sinus aperturalis parvus, rotundus, in canali suturali interno effossus. Canalis basalis brevis, apertus, oblique recurvus, unicarinatus. — Long. 10-12 mill.; diam. max. 3 mill.

Hab. Insula Lifou. Vidi 20 specimina, à R. P. Goubin, S. M., collecta. Varietas β. Lilacea, J. Hervier.

Omninò cinereo-violacea; archetypo similis in forma et sculptura.

Hab. Insula Lifou. Vidi 10 specimina.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, turretedelongated, subulate, acute apex, rather solid, bright, yellow-brown, with purple spiral cords. From 15 to 18 whorls: three purplish embryonic whorls, carinated, striated; slightly flattened intermediate whorls, separated by a waved, slightly thick and slightly deep suture, superior whorls with two spiral cords, inferior whorls with three spiral cords, cords are tubercled, equal, equally distant in the same whorl (tubercles are slightly spherical); longitudinally costulate, finely striated in the interspaces between the spiral cords, sometimes smooth. The last whorl is depressed at the base, narrow and slightly flattened near the siphon, adorned by six-seven tubercled spiral cords (last three-four ones are smaller). Obliquely and slightly rounded aperture, angled above at the intersection with the lip and below near the siphon, laterally fissured. Arched columella. The lip is depressed near the siphon, flattened below the suture, semi-circular in the centre, obliquely protruding, internally canaliculated under the suture, below (near the siphon) almost jointed to the columella. Small sinus of the aperture, rounded, internally carved in the suture. Short siphon, opened, obliquely curved, unicarinated. — Length 10-12 mm, maximum diameter 3 mm. Locality: Lifou Island. I saw 20 specimens collected by R. P. Goubin. Variety β lilacea, J. Hervier.

Entirely grey-violet, for the rest similar in shape and sculpture to the nominal species.

Locality: Lifou Island. I saw 10 specimens.

DIAGNOSIS. — Shell conical with rather flat sides. Illustrated syntype 7.1 mm high. Teleoconch of c. 11 whorls. Three spiral cords present, the second appearing on the fifth whorl. First and third cords with tubercles at the intersection with orthocline axial ribs. Second cord initially with thin tubercles becoming larger on the lower whorls. Spiral microsculpture of fine threads between the spiral cords. Peristome without additional cords. Base with three additional spiral cords of which the first with tubercles, the second with thin tubercles and the third smooth. Teleoconch brownish with the tubercles of the third (and sometimes second) cord whitish. Protoconch missing in the syntypes.

Figures

FIG. 27. — Triforis (Inella) montrouzieri Hervier, 1898, Lifou, New Caledonia: A, G, original figure in Hervier (1898); B-F, H-J, syntype, MNHN-IM-2000-1504; front (B, C), side (D, E), back (F), peristome (H, I), microsculpture (J); K, L, original labels. Scale bars: B-F, 1 mm; H, I, 0.5 mm; J, 0.1 mm.