Triforis (Mastonia) taeniolata 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) taeniolata Hervier, 1898 ( Fig. 31 )

Triforis (Mastonia) taeniolata Hervier, 1898: 258 , illustrated by Hervier (1899: pl. 16, figs 8).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Syntype. New Caledonia • MNHN-IM-2000-1249; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongatula, circa medium tumida, latere convexa, apice acuminata, solida, flava, rufo-taeniata. Anfractus circa 12 (apice fracto), lentè accrescentes, sutura pròfunda, canaliculata discreti, longitudinaliter costulati, transversim 3 liris gemmiferis ornati, interstitiis laevigatis. Costulae liris majoribus subaequales; lirae dispariles, mediana minor, prima et tertia multo majores; lira inferiore inter gemmas rufo picta. Ultimus anfractus subconvexus, ad ortum canalis coarctatus, 5 liris gemmiferis (prima et quarta validioribus) praecinctus. Canalis basalis brevis, obliquus, valdè recurvus, ferè clausus, unicarinatus. Apertura subrotunda, infrà et suprà lateraliter angulosa. Columella arcuata, valdè obliqua. Labrum arcuatum, prominens, infernè columellae quasi junctum, supernè infrà suturam breviter et rotundè fissuratum. — Long. 5-6 mill.; diam. max. 2-2.50 mill.

Hab. Insula Lifou. Vidi 5 specimina, à R. P. Goubin, S. M., collecta.

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, elongated, broad centrally, laterally convex, acute apex, solid, yellowish, red-banded. About 12 whorls (without apex), slowly growing, separated by a deep and canaliculated suture, longitudinally costulate, adorned by three tubercled spiral cords, smooth interspaces. The ribs of the bigger spiral cords are slightly equal, unequal spiral cords, the central one is smaller, the first and third ones are much larger; the inferior cord is coloured in red. The last whorl is slightly convex, narrow near the siphon, with five tubercled spiral cords (first and fourth cords are stronger). Short siphon, oblique, strongly curved, almost closed, unicarinated. Slightly rounded aperture, laterally angled below and above. Arched columella, strongly oblique. Arched lip, protruding, below almost attached to the columella, above roundly and shortly fissured under the suture. — Length 5-6 mm; maximum diameter 2-2.50 mm.

Locality: Lifou Island. I saw 5 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell cyrtoconoid. Syntype 3.9 mm high.Teleoconch of c. 7.5 whorls. Three spiral cords present, the second appearing on the fifth whorl. First and third cords with tubercles at the intersection with rather orthocline ribs. Second cord initially as a fine thread, but later developing thin tubercles. Base with two additional spiral cords of which the first tubercled and the second rather smooth. Teleoconch light brown to yellowish, with the brown interspaces between the tubercles on the third spiral cord.

Figures

FIG. 31. — Triforis (Mastonia) taeniolata Hervier, 1898, Lifou, New Caledonia: A, original figure in Hervier (1898); B-J, syntype, MNHN-IM-2000-1249; front (B, C), side (D, E), back (F), peristome (G, H), apex (I), microsculpture (J); K, original label. Scale bars: B-F, 0.5 mm; G, H, 0.4 mm; I, J, 0.2 mm.