Mastonia ducosensis Jousseaume, 1884

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 : 72

Mastonia ducosensis Jousseaume, 1884 ( Fig. 45 )

Mastonia ducosensis Jousseaume, 1884: 251 , pl. 4, fig. 10.

TYPE LOCALITY. — New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-715; 7 specimens; from type locality.

ORIGINAL DESCRIPTION. — Testa elongato-turrita, violacea, antice perparum ventricosa; anfractibus 20 (primi laevigati, sequentes tuberculis biseriatim dispositis, ornati), sutura tuberculos obtegentibus, separatis; ultimo subcarinato, costis moniliferis quinque, ornato; apertura ovata, lateraliter profunde fissa, fissura ovata; canali subelongato, recurvo, superne oblique striato.

Varietas major , long. 11, lat. 7 millim.

Varietas minor, long. 7, lat. 2 millim.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Turreted-elongated shell, purplish, anteriorly very little swollen; whorls are 20 (the first whorls are smooth, the following are adorned by two series of tubercles), separated by a suture hidden by the tubercles; the last whorl is slightly carinated, adorned by five granulated spiral cords; ovate aperture, laterally deeply fissured, the fissure is ovate; slightly elongated siphon, curved, above obliquely striated.

Varietas major , length 11, diameter 7 mm.

Varietas minor, length 7, diameter 2 mm.

DIAGNOSIS. — Shell conical with flat sides. Syntypes 8.9 and 10.5 mm high. Teleoconch of c. 15 whorls. Three spiral cords present, the second appearing on the ninth whorl. First and third cords with tubercles at the intersection with rather prosocline axial ribs. Second cord initially as a fine thread, but later developing thin tubercles. Spiral microsculpture of weakly granulate fine threads. Peristome with an additional spiral cord below the second and third spiral cords. Posterior sinus deep. Base with two additional spiral cords of which the first with tubercles, the second smooth. Teleoconch light violet with yellow tubercles on the third spiral cord. Protoconch missing in the syntypes.

Figures

FIG. 45. — Mastonia ducosensis Jousseaume, 1884, New Caledonia: A, original figure in Jousseaume (1884); B-G, syntype 1, MNHN-IM-2000-715: front (B), side (C), back (D), peristome (E, F), microsculpture (G); H, Syntype 2, MNHN-IM-2000-715: front; I-K, original labels. Scale bars: B-D, H, 2 mm; E, F, 0.5 mm; G, 0.4 mm.