Triforis (Mastonia) quadrimaculata 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 : 51-53

Triforis (Mastonia) quadrimaculata Hervier, 1898 ( Fig. 29 )

Triforis (Mastonia) quadrimaculata Hervier, 1898: 264 , illustrated by Hervier (1899: pl. 17, fig. 10).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-502; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , ovato-elongata, obesa, apice acuminata, solida, alba, fasciis subquadratis fusco-nigris maculata, circa canalem et aperturam nigro tincta. Anfractus 12 (?), sutura lineari indistinctè discreti, priores bilirati, inferiores liris 3 cingulati; lirae, prima et tertia crassae, gemmiferae, gemmis rotundis, junctis, aequalibus; lira intermedia multò minor, cohaerendo intercurrens, gemmis lenticularibus ornata. Ultimus anfractus convexus, lentè versùs basin attenuatus, seriatim quinquegemmatus, gemmis primae et tertiae seriei majoribus. Canalis brevissimus, unicarinatus, semiclausus, oblique recurvus. Apertura subtubiformis. Columella arcuata, nigro tincta. Labrum subrotundè prominens, ad ortum canalis infrà columellae junctum. — Long. 4-4.50 mill.; diam. max. 2 mill.

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

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, ovateelongated, broad, acute apex, solid, white, spotted with squarish brown-blackish bands, coloured in black near the siphon and the aperture. Whorls are 12 (?), separated by an indistinct and linear suture, first whorls with two spiral cords, lower ones with three spiral cords; first and third cords are thick, tubercled, tubercles are rounded, jointed, equal; the intermediate cord is much smaller, running very close to the others, adorned by lenticular tubercles. The last whorl is convex, slowly attenuated towards the base, with five series of tubercled spiral cords, tubercles from the first and third series are bigger. Very short siphon, unicarinated, partly closed, obliquely curved. Slightly tubular aperture. Arched columella, coloured in black. Protruding and slightly rounded lip, inferiorly attached to the columella near the siphon. — Length 4-4.50 mm; maximum diameter 2 mm.

Locality: Lifou Island. I saw 8 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell cyrtoconoid. Syntype 3.9 mm high.Teleoconch of c. 7 whorls. Three spiral cords present, the second appearing on the fifth whorl. First and third cords with tubercles at the intersection with rather orthocline axial ribs. Second cord initially as a fine thread, but later developing thin tubercles. Microsculpture of very fine spiral and axial threads crossing each other, giving a reticulate pattern. Peristome with additional cords below the second and third spiral cord. Base with three additional cords of which the first and second with tubercles, the third smooth. Teleoconch white with large square dark brown blotches, base and siphonal canal dark brown. Protoconch missing in the syntype.

Figures

FIG. 29. — Triforis (Mastonia) quadrimaculata Hervier, 1898,Lifou, New Caledonia:A, original figure in Hervier (1898); B-H, J, Syntype, MNHN-IM-2000-502: front (B, C), side (D, E), back (F), peristome (G, H), microsculpture (J); I, K, original labels. Scale bars: B-F, 1 mm; G, H, 0.4 mm; J, 0.2 mm.