Mastonia servaini 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 : 94-97

Mastonia servaini Jousseaume, 1884

( Fig. 65 )

Mastonia servaini Jousseaume, 1884: 253 pl. 4, fig. 11.

TYPE LOCALITY. — Aden, Yemen [Red Sea, see Remarks].

TYPE MATERIAL. — Syntype. Yemen • MNHN-IM-2000-1381; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — Testa subulata , elongato-turrita, solida, granulis biseriatim dispositis, ornata; anfractibus 14 irregulariter rapideque crescentibus, tuberculis seriei anterioris albis, seriei posterioris aurantiis, intervallis nigris separatis; ultimo costis quinis granulosis, cincto; apertura ovato-rotundata, lateraliter profunde fissa, canali brevi, clauso, recurvo, superne costis duabus ornato, munita. — Long. 6, lat. 2 millim.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Subulate shell, turreted-elongated, adorned by two series of granules; 14 rapidly and irregularly growing whorls, the anterior series of tubercles is white, the posterior one is orange, separated by brown intervals; last whorl with five granular spiral cords; ovate-rounded aperture, laterally deeply fissured, with a short, closed and curved siphon, above adorned by two spiral cords. — Length 6, diameter 2 mm.

A B C D E F G H J K

I

DIAGNOSIS. — Shell weakly cyrtoconoid. Syntype 6.5 mm high. Teleoconch of c. 11 whorls. Three spiral cords present, the second appearing on the tenth whorl. First and third cords with tubercles at the intersection with rather prosocline axial ribs. Second cord as a thin thread. Spiral microsculpture of weakly granulate fine threads. Posterior sinus shallow. Base with three additional spiral cords of which the first tubercled, the other two smooth. Protoconch missing in the syntype. Teleoconch light brown to yellow, the third spiral cord and the first spiral cord on the base have white tubercles and brown interspaces.

REMARKS. — Jousseaume (1884) stated as type locality the “ environs d’Aden, sur la Mer Rouge ”. The British 19th century Aden Protectorate did not extend into the Red Sea, so we assume that the precise type locality is somewhere near the Bab al-Mandab Strait.

Figures

FIG. 65. — Mastonia servaini Jousseaume, 1884, Aden, Yemen: A, original figure in Jousseaume (1884); B-I, syntype MNHN-IM-2000-1381; front (B, C), side (D, E), back (F), peristome (G, H), microsculpture (I); J, K, original labels. Scale bars: B-F, 0.5 mm; G, H, 0.4 mm; I, 0.2 mm.