Hypselostomatidae is a large family of terrestrial pulmonate molluscs currently represented by 284 extant species, most confined to Southeast Asia. The current system of grouping species into genera is based on the morphology of the apertural barriers and the level of last whorl detachment. However, these characters overlap, challenging generic definitions. In this paper, these characters are evaluated and a novel classification proposed for hypselostomatid species belonging to the genera Anauchen (17 species), Bensonella (36 species), Boysidia (7 species, in part) and Hypselostoma (85 species). We assigned all species belonging to the genera Bensonella and Hypselostoma into two and four species groups respectively, which are characterised by combinations of morphological traits. Altogether 46 new species are described, seven species in Anauchen: A. crassus Gojšina, Hunyadi & Páll-Gergely, sp. nov., A. evanidus Gojšina & Páll-Gergely, sp. nov., A. grandiportus Gojšina, Grego & Páll-Gergely, sp. nov., A. obesus Gojšina, Hunyadi & Páll-Gergely, sp. nov., A. picasso Gojšina & Páll-Gergely, sp. nov., A. turritus Gojšina, Hunyadi & Páll-Gergely, sp. nov., A. jokaii Gojšina & Páll-Gergely, sp. nov.; 19 species in Bensonella: B. alycaeus Gojšina & Páll-Gergely, sp. nov., B. cardiostoma Gojšina, Vermeulen & Páll-Gergely, sp. nov., B. cristatissima Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. dha Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. dracula Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. exploda Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. fracta Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. microdentata Gojšina & Páll-Gergely, sp. nov., B. mitochondria Gojšina, Vermeulen & Páll-Gergely, sp. nov., B. mirabilis Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. montawa Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. multidentata Gojšina, A. Reischütz & Páll-Gergely, sp. nov., B. nitens Gojšina & Páll-Gergely, sp. nov., B. obex Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. perfecta Gojšina & Páll-Gergely, sp. nov., B. sericata Gojšina & Páll-Gergely, sp. nov., B. serrata Gojšina, Hunyadi & Páll-Gergely, sp. nov., B. spelaea Gojšina, Grego & Páll-Gergely, sp. nov., B. spinosa Gojšina, Hunyadi & Páll-Gergely, sp. nov.; 20 species in Hypselostoma: H. aquila Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. bubalus Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. circumcarinatum Gojšina, Auffenberg & Páll-Gergely, sp. nov., H. coriaceum Gojšina & Páll-Gergely, sp. nov., H. aenigma Gojšina, Grego & Páll-Gergely, sp. nov., H. fortunatum Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. fungus Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. geckophilum Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. iunior Gojšina & Páll-Gergely, sp. nov., H. ophis Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. platybasis Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. populare Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. sculpturatum Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. similare Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. sorormajor Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. sororminor Gojšina, Hunyadi & Páll-Gergely, sp. nov., H. torta Gojšina, Auffenberg & Páll-Gergely, sp. nov., H. vesovici Gojšina & Páll-Gergely, sp. nov., H. vicinum Gojšina, Auffenberg & Páll-Gergely, sp. nov., H. vujici Gojšina & Páll-Gergely, sp. nov. One replacement name is proposed: H. tertiusfrater Gojšina & Páll-Gergely, nom. nov. pro Boysidia salpinx F. G. Thompson & Dance, 1983, non Hypselostoma salpinx (van Benthem Jutting, 1961) (originally described as Gyliotrachela). Gyliotrachela and Antroapiculus are both treated as junior synonyms of Hypselostoma. An additional 28 species and subspecies are reassigned to the synonymies of other taxa.

To date, the genus Diaphera Albers, 1850 was represented by a single species (D. prima Panha, 2010) in Thailand, and another (D. saurini Benthem Jutting, 1962) was known from Cambodia. Here we report D. prima for the first time from Cambodia, and describe two new species (D. pongrati, new species, D. parini, new species) from Eastern Thailand. Both new species live sympatrically with D. prima, which is reported here from Chachoengsao, Chon Buri, Rayong, and Sa Kaeo Provinces.

Trichochloritis kiralyi sp. nov. is described from Sichuan Province, China. This new species is most similar to Trichochloritis adaequata (Gredler, 1894), which has a more elevated spire and a narrower umbilicus. Trichochloritis hunanensis Yen, 1939 is a new synonym of T. adaequata.

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.

Angustopila elevata (Thompson et Upatham, 1997) was originally described from northern Thailand. It is the most widespread species within the genus Angustopila Jochum, Slapnik et Páll-Gergely, 2014, as revealed by a recent revision. The distribution of this species extends from southern Thailand through northern Laos and northern Vietnam to the Guangxi Zhuang Autonomous Region in Southern China. Based on shells recently collected in India, conspecificity was established between A. milium (Benson, 1853) and A. elevata, syn. nov. Furthermore, A. milium is reported from Nepal for the first time. Angustopila milium thus becomes the most widespread species of this genus and one of the most widely distributed land-snail species in South and Southeast Asia.