Mastonia limosa 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 : 77-80

Mastonia limosa Jousseaume, 1884

( Fig. 51 )

Mastonia limosa Jousseaume, 1884: 263 , pl. 4, fig. 16.

TYPE LOCALITY. — New Caledonia.

TYPE MATERIAL. — Syntypes. New Caledonia • MNHN-IM-2000-706; 5 specimens; from type locality.

ORIGINAL DESCRIPTION. — Testa elongato-turrita, solidula, nigrescente, ad basin rotundata; anfractibus 16-17 tuberculis biseriatim dispositis cinctis, tuberculorum interstitiis latis et profunda linea mediana separatis; sutura vix distincta; ultimo costis sex munito: quarum tribus posticis moniliformibus, alteris laevigatis; apertura subovata, lateraliter fissa; canali brevi, recurvo, tenuissime striato. — Long. 7.9, lat. 2-2.5 millim. [Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Turreted-elongated shell, rather solid, brownish, rounded at the base; from 16 to 17 whorls with two series of tubercles, tubercles interspaces are separated by a large and deep median line; barely distinct suture; last whorl with six spiral cords: tubercled the three posterior ones, smooth the others; subovate aperture, laterally fissured; short siphon, curved, finely striated. — Length 7.9, diameter 2-2.5 mm.

DIAGNOSIS. — Shell conical with flat sides. Illustrated syntypes 7.2 and 8.9 mm high. Teleoconch of c. 13-14 whorls. Three spiral cords present, the second appearing on the tenth whorl. First and third cords with tubercles at the intersection with prosocline axial ribs. Second cord initially as a fine thread, but later developing thin tubercles. Peristome with an additional spiral cord below the second spiral cord. Posterior sinus shallow. Base with three smooth additional spiral cords. Teleoconch brown, tubercles light brown on a dark brown background. Protoconch missing in the syntypes.

Figures

FIG. 51. — Mastonia limosa Jousseaume, 1884, New Caledonia: A, original figure in Jousseaume (1884); B-J, syntype 1, MNHN-IM-2000-706: front (B, C), side (D, E), back (F), apex (G, H), peristome (I, J); K-O, syntype 2, MNHN-IM-2000-706: front (K), side (L), back (M), peristome (N, O); P-R, original labels. Scale bars: A-F, K, M, 1 mm; G, H, 0.2 mm; I, J, N, O, 0.5 mm.