Triforis (Inella) rutilans 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 : 53-55

Triforis (Inella) rutilans Hervier, 1898 ( Fig. 30 )

Triforis (Inella) rutilans Hervier, 1898: 255 , illustrated by Hervier (1899: pl. 16, figs 4-4a).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-1106; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongato-subulata, angusta, valdè acuminata, vix solidula, nitidissimè luteo-fulva. Anfractus 20-23: embryonales corneo-brunnei, bicarinati, verticaliter striatuli; intermedii convexi, obliquè accrescentes, sutura lineari, subcanaliculata discreti, longitudinaliter costulati, transversis liris decussati. Costulae rotundae, laevigatae, intervallo aequales; lirae gemmiferae 3, costulis minores, mediana prominente; lira prima minor, medianae proximior; quarta lirula, undulata, sub lente vix obvia, suturam inferiorem supereminens. Ultimus anfractus convexus, 4 liris gemmiferis cinctus, versùs basin declivis, ante canalem subplanatus ibique 2 lirulis ornatus . Canalis basalis brevis, apertus, obliquè recurvus. Apertura subpentagonalis. Columella medio concava, supernè planate; labrum prodiens, quadrangulare, infernè ad canalem basalem quasi junctum; supernè lateraliter fissuratum; sinus suturalis parvulus, subrotundus, in ultima lira effossus. — Long. 8-9 mill.; diam. max. 2 mill.

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

Varietas β. Violacea, J. Hervier.

Archetypo similis in forma et sculptura, violaceo colore omninò tincta; anfractus embryonales corneo-lutei.

Hab. Insula Lifou: 4 specimina vidi.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, subulate-elongated, narrow, strongly acute, rather solid, very bright yellow-brownish. From 20 to 23 whorls: embryonic whorls are brownish, bicarinate, vertically striated; intermediated whorls are convex, obliquely growing, separated by a linear and slightly canaliculated suture, longitudinally costulate, transversally crossed by spiral cords. Ribs are rounded, smooth, equally distant; three tubercled spiral cords, smaller than the ribs, the central one is protruding; the first cord is smaller, closer to the central one; the fourth cord is waved, barely visible, overlaying the inferior suture. The last whorl is convex, with four tubercled spiral cords, leaning towards the base, flattened near the siphon where it is bears two small spiral cords. Short siphon, open, obliquely curved. Subpentagonal aperture. Columella is concave in the centre, flattened above; protruding lip, quadrate, below almost attached to the siphon; above laterally fissured; small sutural sinus, slightly rounded, carved in the last spiral cord. — Length 8-9 mm, maximum diameter 2 mm. Locality: Lifou Island. I saw 10 specimens collected by R. P. Goubin. Variety β violacea, J. Hervier.

Similar to the nominal species in form and sculpture, completely violet in colour; corneous-yellow protoconch.

Locality: Lifou Island. I saw 4 specimens.

DIAGNOSIS. — Shell elongated with flat sides. Syntype 7.8 mm high. Teleoconch of 15 whorls. Three tubercled spiral cords present since the first teleoconch whorl. An extra smooth spiral thread present suprasuturally. Peristome with additional cords below the first and the second spiral cords. Posterior sinus shallow. Base with three additional cords of which the first very prominent and tubercled, the other two weak and smooth. Multispiral protoconch of c. 4.5 whorls with two strong spiral keels and axial riblets. First 1.5-2 teleoconch whorls white, other teleoconch whorls yellow to light brown. Protoconch brown.

Figures

FIG. 30. — Triforis (Inella) rutilans Hervier, 1898, Lifou, New Caledonia: A, G, original figure in Hervier (1898); B-F, H, I, K-M, syntype, MNHN-IM-2000-1106; front (B, C), side (D, E), back (F), peristome (H, I), microsculpture (K), protoconch (L, M); J, N, original labels. Scale bars: B-F, 1 mm; H, I; 0.4 mm; K-M, 0.2 mm.