Inella xystica 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 : 99-101

Inella xystica Jousseaume, 1884

( Fig. 69 )

Inella xystica Jousseaume, 1884: 247 , pl. 4, fig. 8.

TYPE LOCALITY. — Madagascar.

TYPE MATERIAL. — Syntype. Madagascar • MNHN-IM-2000-491; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — Testa conico-elongata, cancellata, rufonigricante; anfractibus fere 14 vel 15 planis, tuberculorum seriebus tribus albescentibus-ornatis, sutura profunda, canaliculata, distinctis; intervallo tuberculorum toruloso, rufoque tincto; ultimo ad basin planulato, costis quinis moniliferis, ornato; apertura rotundata, lateraliter late fissa; canali subelongato, recurvo, superne striato. — Long. 13, lat. 4 millim.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Conical-elongated shell, cancellate, red-brownish; usually from 14 to 15 flattened whorls, adorned by three series of whitish tubercles and separated by a deep and canaliculated suture; the interspace between tubercles is coloured in reddish; last whorl flattened at the base, adorned by fine granular spiral cords; rounded aperture, laterally and largely fissured; slightly elongated, curved siphon, striated above. — Length 13, diameter 4 mm.

DIAGNOSIS. — Shell cyrtoconoid with flat sides. Syntype 11.2 mm high. Teleoconch of c. 11 whorls. Three spiral cords present, the second appearing on the fifth whorl. First two cords with tubercles at the intersection with orthocline axial ribs. Second cord initially as a fine thread, but later developing tubercles. Peristome without additional spiral cords. Posterior sinus shallow. Base with two tubercled additional spiral cords. Protoconch missing in the syntype. Shell dark brown with light brown to white tubercles. Siphonal canal light brown.

Figures

FIG. 69. — Inella xystica Jousseaume, 1884, Madagascar: A, original figure in Jousseaume (1884); B-G, syntype: MNHN-IM-2000-491: front (B), side (C), back (D), peristome (E, F), microsculpture (G); H, I, original labels. Scale bars: B-D, 2 mm; E, F, 0.5 mm; G, 0.4 mm.