Mastonia tulipa Jousseaume, 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 : 99

Mastonia tulipa Jousseaume, 1898

( Fig. 68 )

Mastonia tulipa Jousseaume, 1898: 73 , not illustrated.

ORIGINAL LOCALITIES. — Aden, Perim Island (Bab al-Mandab Strait, Yemen), Djibouti.

TYPE MATERIAL. — Syntypes. Djibouti • MNHN-IM-2000-494; 10 specimens; “ Aden, Djibouti”. Yemen • MNHN-IM-2000-495; 6 specimens; Aden • MNHN-IM-2000-1580; 2 specimens; Perim Island , Bab al-Mandab Strait, Yemen .

ORIGINAL DESCRIPTION. — Testa solida, subulata , elongato-turrita, fulvo et rubello spiraliter zonata, granulis triseriatim dispositis cincta, mediana minor alterae aequales; anfr. 14 15 sat regulariter crescenti, sutura profunda distincta separati, primi fere laevigati, uncarinati, sequentes seriebus tuberculorum (antice 2 fulvis altera rubella) ornati, ultimus costis quinis granulosis (medianis 3 fulvis alteris rubellis) rugatus; apertura rotundato-ovalis lateraliter profunde fissa; canalis brevis, rubellus, recurvus. Long. 3mm; diam. 1mm 2.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Solid shell, subulate, turreted-elongated, spirally banded in yellow and reddish, with three granular spiral cords, the middle one smaller, the others equal in size; from 14 to 15 quite regularly growing whorls, separated by a distinct and deep suture, first whorls slightly smooth, unicarinated, subsequent whorls adorned by series of tubercles (the anterior two series are brown, the other series reddish); last whorl with five granular spiral cords (three median brown cords, the other cords are reddish); ovate-rounded aperture, laterally deeply fissured; short, reddish and curved siphon. Length 3 mm; diameter 1.2 mm.

DIAGNOSIS. — Shell conical with flat sides. Illustrated syntypes 3.6 and 5.7 mm high. Teleoconch of 11 whorls. Three spiral cords present, the second appearing on the seventh 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 tubercles. Peristome without additional spiral cords. Posterior sinus relatively deep. Base with three additional spiral cords of which the first tubercled, the other two smooth. Multispiral protoconch of five whorls with one spiral keel; axial riblets departing from the suture but not reaching the spiral keel apically. Protoconch sculpture more obsolete on its second and third whorls. Teleoconch orange to light brown with the first spiral cord white. Protoconch whitish to pinkish.

Figures

FIG. 68. — Mastonia tulipa Jousseaume, 1898, “Aden, Djibouti”: A-K, syntype 1, MNHN-IM-2000-494: front (A, B), side (C, D), back (E), peristome (F, G), protoconch (H, I), microsculpture (J), first protoconch whorl (K); L-N, syntype 2, MNHN-IM-2000-494: front (L), side (M), back (N); O, original label. Scale bars: A-E, L-N, 1 mm; F, G, 0.4 mm; H-J, 0.2 mm; K, 0.05 mm.