Integrative taxonomic revision of the land snail genus Godwin-Austen, 1907 in Thailand, with descriptions of nine new species (Eupulmonata, Ariophantidae).

Members of the land snail genus Godwin-Austen 1907 are superficially similar and difficult to differentiate by their shell morphology so that their species limits are still unclear. In order to resolve the taxonomy of this group, a phylogenetic reconstruction of is presented, based on morphological and anatomical characters, as well as on partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene. In total, 23 species of are recognised in Thailand, and nine species are new to science, namely Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , Pholyotha & Panha, , and Pholyotha & Panha, Results from genital examination and COI analyses confirm the monophyly of and its species. The intra- and inter-specific genetic distances of were 0-3.7% and 4.6-12.0%, respectively. Colour images of the living adults, shell, and genitalia along with SEM images of the spermatophore and radula are given. In addition, an identification key and a geographical distribution map of species are provided.