A taxonomic revision of the land snail genus Acinolaemus F. G. Thompson & Upatham, 1997 (Gastropoda, Eupulmonata, Hypselostomatidae), with notes on Clostophis W. H. Benson, 1860 species from Cambodia, Thailand, and Vietnam

In this work, the hypselostomatid land snail genus Acinolaemus F.G. Thompson & Upatham, 1997 in Southeast Asia is revised. Characters based on which the genus was originally erected are thoroughly examined and evaluated. The genus is subdivided into six species groups based on similarities in shell surface sculpture and apertural barrier morphology. Four out of five species originally described in Acinolaemus , as well as species described from Vietnam and Cambodia are moved to Clostophis . Thirteen new species of Acinolaemus are described as follows: A. altus Gojšina, Hunyadi & Páll-Gergely, sp. nov ., A. asper Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. atypicus Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. ferox Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. humilis Gojšina, Hunyadi & Páll-Gergely, sp. nov ., A. microcubus Gojšina, Hunyadi & Páll-Gergely, sp. nov ., A. paucidentatus Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. profundus Gojšina, Auffenberg & Páll-Gergely, sp. nov ., A. rugolabialis Gojšina, Hunyadi & Páll-Gergely, sp. nov ., A. simplex Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. singularis Gojšina, Tongkerd & Páll-Gergely, sp. nov ., A. solitus Gojšina, Hunyadi & Páll-Gergely, sp. nov ., A. zed Gojšina, Hunyadi & Páll-Gergely, sp. nov . Thus, the total number of Acinolaemus species increases to 19, all inhabiting Thailand and Myanmar.