Inella perimensis 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 : 90

Inella perimensis Jousseaume, 1898

( Fig. 61 )

Inella perimensis Jousseaume, 1898: 72 , not illustrated.

TYPE LOCALITY. — “Aden, Djibouti, Perim”.

ADDITIONAL ORIGINAL LOCALITIES. — Jeddah.

TYPE MATERIAL. — Lectotype • MNHN-IM-2000-29269; here designated.

Paralectotypes. Saudi Arabia • MNHN-IM-2000-505; 1 specimen; Jeddah ; MNHN-IM-2000-482; 3 specimens; from type locality . Djibouti • MNHN-IM-2000-1587; 1 specimen (not seen) .

Saudi Arabia • Cerithiopsidae indet.; MNHN-IM-2000-29270; 1 specimen; from type locality • Triphoridae indet.; MNHN-IM-2000-29271; 1 specimen; from type locality.

Yemen • Triphoridae indet.; MNHN-IM-2000-481; 2 specimens; Aden • MNHN-IM-2000-480; 1 specimen; Perim Island, Bab alMandab Strait .

ORIGINAL DESCRIPTION. — Testa rosaceo-rubida, solidula, cylindraceoconica, obesula ; anfr. 14, sutura profunda canaliculata discreti, primi minutissimi, albi, sequentes 3 fulvi, unicarinati, intertitiis cancellati, alteri tuberculis oppositis in seriebus tribus dispositis ornati, intertiis cancellatis, alveolatis, ultimus ad basim subcanaliculatus, carinis moniliformibus quinque rugatus; apertura subovalis, lateraliter fissa; canalis brevis parum apertus. Long. 4mm 6; diam. 1mm 3.

[Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Pink-reddish shell, rather solid, cylindrical-conical, broad; 14 whorls separated by a deep canaliculated suture, first whorls very small, white, subsequent whorls brown, unicarinated, with cancellate interspaces, the other whorls are adorned by three series of tubercles, with cancellate interspaces, with honeycomb-like cavities, the last whorl is slightly canaliculated at the base, with five tubercled spiral cords; subovate aperture, laterally fissured; short and slightly open siphon. Length 4.6 mm; diameter 1.3 mm.

DIAGNOSIS. — Shell conical with flat sides. Lectotype 4.3 mm high, illustrated paralectotype 2.6 mm high. Teleoconch of 5.5-8 whorls. Three spiral cords present, the second appearing on the fourth whorl. First and third 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 three weakly tubercled additional spiral cords. Multispiral protoconch of five whorls with one spiral keel and equally strong axial riblets. Teleoconch violet. Protoconch brown.

REMARKS. — The type series contains several lots and more than one species. Lot MNHN-IM-2000-482 contained a Cerithiopsid ( Fig. 60U ). The lot MNHN-IM-2000-480 contains a single white specimen ( Fig. 60 R-S), with a more elongated shape, and thicker and more strongly tubercled spiral cords on the base. Similar white specimens were present in MNHN-IM-IM-2000-481 (2 specimens, but one is so worn to hamper any identification). MNHN-IM-2000-482 contained a white specimen with a weaker first spiral cord ( Fig. 60T ); its general appearance may reflect a teratological specimen as well as a distinct species, but the shell condition is inadequate for a precise identification. Last,the type series contained also two fresh pink to violet specimens (“ rosacea-rubida ” as in Jousseaume’s original description). One of them shares the same approximate number of whorls and size as in the original description and is here designated as lectotype to stabilize nomenclature ( Fig. 60 A-F).

Figures

FIG. 61. — Inella perimensis Jousseaume, 1898: A-F, lectotype, MNHN-IM-2000-29269: front (A, B), side (C, D), back (E), microsculpture (F); G, original label lot MNHN-IM-2000-482; H-Q, paralectotype, MNHN-IM-2000-505, Jeddah, Saudi Arabia: front (H, I), side (J, K), back (L), peristome (M, N), first protoconch whorl (O), protoconch (P-Q); R-S, Triphoridae indet., paralectotype, MNHN-IM-2000-480: front; T, Triphoridae indet., paralectotype, MNHN-IM-2000-29271: front; U, Cerithiopsidae indet., paralectotype, MNHN-IM-2000-29270: front; V-W, original labels MNHN-IM-2000-505. Scale bars: A-E, R-U, 1 mm; F, P-Q, 0.2 mm; H-L, 0.5 mm; M, N, 0.4 mm; O, 0.1 mm.

FIG. 60. — A-H, Mastonia peanites Jousseaume, 1898, Djibouti, lectotype, MNHN-IM-2000-29267: front (A, B), side (C, D), back (E), peristome (F, G), microsculpture (H); I, paralectotype, MNHN-IM-2000-506: front; J, Mastonia cf. servaini Jousseaume, 1884, Djibouti, MNHN-IM-2000-29268: front; K, L, original labels. Scale bars: A-E, I, J, 1 mm; F, G, 0.5 mm; H, 0.2 mm.