Clostophis obliquus, Páll-Gergely & Hunyadi, 2022

Páll-Gergely, Barna & Hunyadi, András, 2022, New and little-known species of Clostophis Benson, 1860 from Southeast Asia (Gastropoda: Eupulmonata: Hypselostomatidae), Raffles Bulletin of Zoology 70, pp. 417-439 : 434

Clostophis obliquus , new species

( Fig. 17 )

Type material. Holotype (SH: 1.19 mm, SW: 1.18 mm) ( HNHM 105324 ), China, Guangxi, Liuzhou Shi, 12 km southeast from Douleyan Scenic Area , 110 m a.s.l., 24°13.666′N, 109°24.643′E (locality code: 2009/68), coll. A. Hunyadi, 6 October 2009 . Paratypes: 3 shells, same as for holotype, coll. HA.

Diagnosis. A conical Clostophis species with four apertural barriers: outer part of angulo-parietal lamella tilts towards palatal wall, inner part longer, turns to opposite direction; two palatal folds short, thin (blade-like), oblique (descending inside aperture), situated in some distance from peristome; columellar tooth also short, blunt (knob-like).

Description. Shell conical, widest at its base, as high as wide. Whorls very slightly, bluntly shouldered. Protoconch consisting of 1.5 whorls, finely pitted/granular, and weakly spirally striated preceding the first teleoconch whorl. Entire shell consisting of 5 whorls, with relatively strong, irregular radial growth lines and equally strong, dense, irregularly spaced spiral striae. Body whorl with few, ca. 20–24 spiral striae from apertural view. Umbilicus regularly growing, normally wide, ca. one third of shell width. Aperture slightly oblique to shell axis, oval teardrop-shaped with a blunt sinulus. Sinulus small, well separated due to elevated angulo-parietal lamella and upper palatal tooth. Parietal callus rather blunt, not smeared to penultimate whorl. Peristome expanded, not reflected. Angulo-parietal lamella long, elevated, its outer part shorter, strongly oblique, tilts towards palatal wall, inner part longer, gradually (as it goes deeper) tilts towards columella. Palatal wall with two short blade-like, oblique lamellae; upper one nearly reaches peristome, its inner end is situated lower than the outer one; inner one situated slightly deeper, also oblique (outer end situated higher up, while inner end is lower). Columellar tooth also short, blunt (knob-like), situated in some distance from peristome.

Figures

Fig. 17. Clostophis obliquus, new species (holotype, HNHM 105324).