Seven new hypselostomatid species from China, including some of the world’s smallest land snails (Gastropoda, Pulmonata, Orthurethra)

Abstract

Seven new species of Hypselostomatidae are described from the Chinese province Guangxi: Angustopila dominikae Páll-Gergely & Hunyadi, sp. n., Angustopila fabella Páll-Gergely & Hunyadi, sp. n., Angustopila subelevata Páll-Gergely & Hunyadi, sp. n., Angustopila szekeresi Páll-Gergely & Hunyadi, sp. n., Hypselostoma socialis Páll-Gergely & Hunyadi, sp. n., Hypselostoma lacrima Páll-Gergely & Hunyadi, sp. n. and Krobylos sinensis Páll-Gergely & Hunyadi, sp. n. The latter species is reported from three localities. All other new species are known only from the type locality. Specimens nearly identical to the type specimens of Angustopila huoyani Jochum, Slapnik & Páll-Gergely, 2014 were found in a cave in northern Guangxi, 500 km from the type locality. Adult individuals of Angustopila subelevata sp. n. (shell height = 0.83–0.91 mm, mean = 0.87 mm) and Angustopila dominikae sp. n. (shell height of the holotype = 0.86 mm) represent the smallest known members of the Hypselostomatidae, and thus are amongst the smallest land snails ever reported. We note that Pyramidula laosensis Saurin, 1953 might also belong to Krobylos. Paraboysidia neglecta van Benthem Jutting, 1961, which was previously included in Angustopila, is classified in Hypselostoma.

Three new species and a new genus of Hypselostomatidae (Gastropoda: Pulmonata) from Cong Troi Cave, Northern Vietnam

“…The material examined here has spiral threads on the umbilicus and at the base of the shell in sync with Páll-Gergely et al (2015). Panha and Burch (2005) did not observe this characteristic in their investigations of the most similar Thai species Angustopila elevata (Thompson et Upatham, 1997).…”

“…Distribution: Tonkinospira species are known from Northern Vietnam so far (Páll-Gergely et al 2015 and this study). Diagnosis: Small conical shell with convex whorls, less than 1.95 mm broad; aperture edentate.…”

“…SH: 0.83, max SH: 0.91, mean: 0.87: Páll-Gergely et al (2015), but no other conchological differences were found. The parietal callus of one of the shells forms a tooth-like projection (Fig.…”

“…The hypselostomatid genus Angustopila Jochum, Slapnik et Páll-Gergely, 2014 was erected for some Thai and a Chinese species. Additional species were recently added to that genus from southern China (Páll-Gergely et al 2015).…”

Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda)

“…No material of this species was found, and only the type specimen was examined. Páll-Gergely et al (2015c: 31, 55) noted that this species shows a protruding last whorl, narrow umbilicus and simple apertural lip, and suggested that this species should be placed into the genus Krobylos . For the current interpretation of Pa Hia, see Páll-Gergely et al (2016: 13).…”