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An enigmatic land snail species restricted to the karst ecosystem in southern Cambodia and formerly placed in the family Ariophantidae is now reclassified into the family Dyakiidae. Its current systematic position is based on morpho-anatomical characters combined with a molecular phylogeny based on two partial mitochondrial markers (COI and 16S rDNA) and a nuclear gene fragment (28S rDNA). Our results indicate that Khmerquantula gen. nov. is a member of the Dyakiidae with very strong support from both morphological and molecular phylogenetic analyses. The diagnostic characters of this new genus and new species, Khmerquantula leipo are a dextral shell with a well-polished surface, animal with only three dorsal lobes, and reproductive organ without penial verge and amatorial organ papilla. This finding adds a new taxon to current biodiversity and illustrates the growing knowledge of the endemic malacofauna in Cambodia. [ABSTRACT FROM AUTHOR]

Knowledge of Myanmar land snails is based on the late eighteenth to early twentieth century literature and many species need to be re-investigated, especially in the genera Macrochlamys Gray, 1847 and Sarika Godwin-Austen, 1907. In order to update this knowledge, this paper presents information on these two related genera based on new materials from south-eastern Myanmar. Fifteen species are recognised in the south-east of Myanmar. Of these, live material was available for eight Macrochlamys and Sarika species and these are described in full herein, based on data from the shell, external morphology and genitalia, including three species new to science (M. brachystia n. sp., S. concavata n. sp. and S. lopa n. sp.) and five species redescribed (M. aspides, M. kelantanensis, M. petasus, S. consepta and S. obesior). The remaining five species are known only from their shell morphology (M. cauisa, M. perpaula, M. poongee, M. salwinensis and S. birmana) and two species are known from genitalia (S. dugasti and S. resplendens). For these species the shells are figured and some taxonomic remarks are provided. [ABSTRACT FROM AUTHOR]