Triforis (Iniforis) mirifica var. lifuana 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 : 40-43

Triforis (Iniforis) mirifica var. lifuana Hervier, 1898

( Fig. 21 )

Triforis (Iniforis) mirifica var. lifuana Hervier, 1898: 249 , illustrated by Hervier (1899: pl. 15, figs 2-2a).

TYPE LOCALITY. — Lifou, New Caledonia.

TYPE MATERIAL. — Lectotype. New Caledonia • MNHN-IM-2000-29260; here designated.

Paralectotype. Triphoris mirificus Deshayes, 1863 : MNHN-IM-2000-1508; 1 paralectotype (abapical fragment), Lifou, New Caledonia (see Remarks).

ORIGINAL DESCRIPTION. — T. sinistrorsa , elongata , angusta, apice acuminata, alba lutescens, ad basin et ad apicem pallidè brunnea. Anfr. circa 15: priores cornei, angusti, liris duabus inaequalibus, aequidistantibus, pellucidè granulosis ornati. Lira prima minor, in ultimis anfractibus fulvo-luteo tincta; secunda major , cingulo luteo inter margaritas interrupté lineata. Ultimus anfractus longiusculus, basi depressus, liris 4 granulosis ornatus ; in dorsali parte (circa mediam decursûs partem), propè suturam canali tubifero perlongo munitus, indètubulatus, 4 liris granulosis et striis clathratè decoratus, ad aperturam evadens. Canalis basalis elongatus, valdè obliquus, recurvus, omninò clausus. Apertura exigua, circularis, tubulata, prominula, peristomate continuo.

Long. 6-7 mill.; diam. max. 1.25-1.50 mill.

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

TRANSLATION OF THE LATIN TEXT. — Sinistral shell, elongated, narrow, acute apex, white-yellowish, at the base and at the apex light brown. Whorls about 15: first whorls brownish, narrow, with two unequal and equidistant spiral cords, adorned by transparent granules. The first cord is smaller, coloured in brown-yellow in the last whorl; the second cord is larger, characterised by a discontinuous yellow cord between the granules. Last whorl is quite long, depressed at the base, adorned by four granulated spiral cords; in the dorsal part (at about half of the whorl), it is characterised by a very long tubular siphon near the suture, adorned by a cancellated structure with four granulated spiral cords and striae, extending to the aperture. Siphon is elongated, strongly oblique, curved, completely closed. The aperture is small, rounded, tubular, slightly protruding, peristome continuous. Length 6-7 mm; maximum diameter 1.25-1.50 mm. Locality: Lifou Island. I saw 10 specimens collected by R. P. Goubin.

DIAGNOSIS. — Shell very elongated with flat sides. Lectotype 5.9 mm high. Teleoconch of c. 13 whorls. Two spiral cords present with the lower being more prominent. Cords with strong tubercles at the intersections with slightly prosocline axial ribs. A very fine thread present below the first cord. Peristome with an additional cord below the first cord. Posterior sinus well developed and protruding into a canal. Base with two additional tubercled cords. Teleoconch white with brown interspaces between the tubercles on the second cord. First cord becoming light brown on the lower whorls. A brown blotch present on the base.

REMARKS. — The original lot contained a specimen ( Fig. 21 B-F, H, I) and a fragment ( Fig. 21 J-N), the latter not matching the description of lifuana but possibly of Contraforis insulana Laseron, 1958 or Triphora (Iniforis) bellula Kosuge, 1961 . Triforis lifuana is characterized by the dark interspaces between tubercles on the last spiral cord and by having more numerous and less prominent such tubercles. Therefore, we designate the lectotype to stabilize the nomenclature.

Figures

FIG. 21. — Triforis (Iniforis) mirifica var.lifuana Hervier,1898,Lifou,New Caledonia:A, G, original figures in Hervier (1898); B-F, H-J, lectotype,MNHN-IM-2000-29260: front (B, C), side (D, E), back (F), peristome (H, I), microsculpture (J); K-N, Triphoris mirifica Deshayes, 1863 (fragment), paralectotype, MNHN-IM-2000-1508; front (K), side (L), back (M), peristome (N); O, P, original labels. Scale bars: B-F, K-N, 1 mm; H, I, 0.4 mm; J, 0.2 mm.