Triforis (Mastonia) lucidula 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) lucidula Hervier, 1898 ( Fig. 23 )

Triforis (Mastonia) lucidula Hervier, 1898: 261 , illustrated by Hervier (1899: pl. 17, fig. 6).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-1489; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , ovato elongata , obesula , apice acuminata, vix solidula, lucidè nitida, alba, pallidè violacea, in basi sublutescens. Anfractus 15; embryonales 5, unicarinati, striati, pallidè luteo-cornei; intermedii convexo-declives, sutura profunda, canaliculata discreti, longitudinaliter costulati et transversim trilirati. Costulae rotundae, laevigatae, triseriatim subaequaliter et aequidistanter gemmiferae (biseriatim in quatuor subembryonalibus anfr.). Gemmae rotundae, in anfr. ultimis majores; lirae gemmas unientes et superantes. Ultimus anfractus sexiès lirato-gemmatus, gemmis decrescentibus, convexus, ad ortum canalis vix depressus. Canalis basalis brevis, semiclausus, unicarinatus, obliquè recurvus. Apertura obliquè piriformis. Columella arcuata. Labrum infernè canali adhaerens, arcuatum, prominens, quinquecarinatum, lateraliter supernè fissuratum; sinus suturalis, parvulus, elongatulus. — Long. 4-5.50 mill.; diam. max. 1.75-2 mill.

Hab. lnsula Lifou. Vidi 5 specimina, à R. P. Goubin, S. M., collecta Varietas β. Imperfecta, J. Hervier.

Tumidior, biseriatim gemmata, triseriatim in ultimis 3 anfractibus. Hab. lnsula Lifou. Vidi 6 specimina.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, ovate-elongated, broad, acute apex, barely solid, very bright, white, light purplish, slightly yellowish at the base. Whorls are 15; embryonic whorls are five, unicarinated, striated, light yellow-brown; intermediate whorls are convex-sloping, longitudinally costulate and transversally with three spiral cords, separated by a deep channeled suture. Ribs are rounded, smooth, with three series of subequal and equidistant tubercles (two series in four subembryonic whorls). Gemmae are rounded, bigger in the last whorl; spiral cords surmounting and jointed to the tubercles. The last whorl is tubercled and with six spiral cords, tubercles are decreasing, the whorl is convex and barely depressed near the siphon. Short siphon, partly closed, unicarinated, obliquely curved. Obliquely pyriform aperture. Arched columella. The lip is inferiorly attached to the siphon, arched, protruding, with five keels, laterally fissured above; sutural sinus is small and elongated. — Length 4-5.50 mm; maximum diameter 1.75-2 mm.

Locality: Lifou Island. I saw 5 specimens collected by R. P. Goubin. Variety β. imperfecta, J. Hervier.

Broader, with two tubercled spiral cords, and three cords in the last three whorls.

Locality: Lifou Island. I saw 6 specimens.

DIAGNOSIS. — Shell cyrtoconoid. Syntype 5.1 mm high.Teleoconch of 9 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, larger on the lower whorls. Peristome without additional cords. Posterior sinus shallow. Base with two additional tubercled cords. Protoconch multispiral but broken in the syntype, with one spiral keel and several equally strong axial riblets. Teleoconch white with the last whorl being pale yellowish on the first spiral cord and at the base. The second last whorl with a darker background between the spiral cords. Protoconch brown.

Figures

FIG. 23. — Triforis (Mastonia) lucidula Hervier, 1898, Lifou, New Caledonia: A, original figure in Hervier (1898); B-I, K, L, syntype, MNHN-IM-2000-1489; front (B, C), side (D, E), back (F), protoconch (G, H), peristome (I, K), microsculpture (L); J, M, original labels. Scale bars:B-F, 1 mm; G, H, 0.2 mm; I, K, 0.5 mm; L, 0.4 mm.