Clostophis candidus, 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 : 430

Clostophis candidus , new species

( Fig. 12 )

Type material. Holotype (SH: 1.03 mm, SW: 0.92 mm) ( HNHM 105326 ), Vietnam, Lạng SƠn Province, B ắc SƠn District , Long Dong, 3.8 km north from junction of roads no. QL1B (main road) and 241, 390 m a.s.l., 21°56.728′N, 106°19.447′E (locality code: 2020/51), coll. A. Hunyadi, 18 February 2020 . Paratypes: 10 shells, same data as for holotype.

Additional material. 2 juvenile /broken shells (coll. HA), same data as for holotype .

Diagnosis. Clostophis species with a detached aperture are as follows: C. multiformis Páll-Gergely & A. Reischütz, 2020 , C. proboscideus , C. sankeyi , and C. yoga , new species. Clostophis sankeyi and C. proboscideus are larger, have a strongly concave conical shell shape, and possess at least one parietal tooth. The concave conical shell shape also differentiates C. yoga , new species, from C. candidus , new species. Clostophis multiformis has a dome-like, blunter apex (shell shape is not conical) and possesses a parietal tooth.

Description. Shell conical, higher than wide. Whorls rounded. Last part of body whorl (less than quarter whorl) detached from penultimate whorl. Protoconch consisting of ca. 1.25 whorls, finely spirally striated. Entire shell with ca. 4.25 whorls. Umbilicus rounded, slightly wider than one third of shell width. Teleoconch with weak, irregular radial lines and stronger, equidistant spiral striae (20–22 on body whorl in frontal view). Aperture subcircular, toothless, peristome slightly reflected, mostly at its columellar side.

Measurements (in mm). SH = 0.98–1.15, SW = 0.89–1.01 (n =4).

Etymology. The specific epithet candidus (bright, clear, transparent in Latin) refers to the clear, transparent shell.

Figures

Fig. 12. Clostophis candidus, new species. A, paratype (coll. HA); B–H, holotype, HNHM 105326.