Viriola morychus 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 : 81-83

Viriola morychus Jousseaume, 1898

( Fig. 55 )

Viriola morychus Jousseaume, 1898: 76 , not illustrated.

TYPE LOCALITY. — Djibouti.

TYPE MATERIAL. — Syntypes • MNHN-IM-2000-484; 9 specimens; Djibouti .

ORIGINAL DESCRIPTION. — Testa solida, elongata , conico-subulata, nitidiuscula, alba irregulariter rufo-marmorata; anfr. circiter 23, plani, regulariter crescenti, primi 4-5 apice olivaeforme terminantes, sequentes carinis tribus laevibus inaequalibus (antica major mediana minor), cincti, intertiones carinarum excavatae clathratae, sutura funiculo granuloso marginata, ultimus antice planus, parum excavatus, carinis 4 ad aperturam 7, instructus, carina antica granulosa, altera laeves; apertura circularis, alba pallide fusco-zonata, lateraliter fissa; labrum undulatum, externe, septem angulis crenatum, album fulvo pictum; canalis elongates retrorsum recurvus. Long. 9 à 13mm; diam. 1mm 8 à 2mm 5.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Solid shell, elongated, conicalsubulate, slightly bright, irregularly marbled with white and red; about 23 whorls, flattened, regularly growing first four-five whorls ending with an olive-shaped apex, subsequent with three unequal and smooth spiral cords (the anterior cord is larger, the median cord is smaller), interspaces between spiral cords are squarely excavated, the suture is bordered by a small granular cord, anteriorly flattened last whorl, slightly excavated, with seven spiral cords, four near the aperture, anterior cords are granular, the other ones are smooth; rounded aperture, banded in white and light yellow, laterally fissured; waved lip, externally notched with seven bumps, coloured with white and yellow; elongated and backwards curved siphon. Length from 9 to 13 mm; diameter from 1.8 mm to 2.5 mm.

DIAGNOSIS. — Shell elongated with flat sides. Syntypes 7.1 and 12.6 mm high. Teleoconch of c. 14 whorls. Three smooth spiral cords present, the second appearing later. Spiral microsculpture of fine threads next to the main cords; the rest of the interspaces smooth. Peristome with an additional spiral cord below the second. Base with two additional smooth spiral cords, the second rather weak. Teleoconch brown with lighter spiral cords bearing white blotches. Protoconch multispiral of c. 5 whorls bearing two spiral keels and axial riblets. Dark brown blotches also present and mostly visible between the main cords. Base and siphonal canal brown. Protoconch brown.

Figures

FIG. 55. — Viriola morychus Jousseaume, 1898, Djibouti: A-F, syntype 1, MNHN-IM-2000-484: front (A), side (B), back (C), peristome (D, E), microsculpture (F); G-I, syntype 2, MNHN-IM-2000-484: front (G), protoconch (H, I); J-N, original labels. Scale bars: A-C, 2 mm; D, E, 0.5 mm; F, H, I, 0.2 mm; G, 1 mm.