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The endemic terrestrial Crown Snail from Southern Thailand formerly in  Macrochlamys  Gray, 1847 is now described as  Taphrenalla  Pholyotha &amp; Panha gen. nov., based on comparative morphology and molecular data. Overall, eleven  Taphrenalla  species are now recognized, including two nominal species:  T. asamurai  and  T. diadema . A total of nine new species are proposed:  T. alba  sp. nov.,  T. conformis  sp. nov.,  T. corona  sp. nov.,  T. dalli  sp. nov.,  T. incilis  sp. nov.,  T. macrosulcata  sp. nov.,  T. parversa  sp. nov.,  T. pygmaea  sp. nov. and  T. zemia  sp. nov. The molecular phylogeny constructed from the mitochondrial cytochrome oxidase c subunit I (COI) and 16S rRNA gene fragments plus the nuclear 28S rDNA gene fragments revealed that  Taphrenalla  gen. nov. is monophyletic with a well-supported clade. The diagnostic characters of  Taphrenalla  gen. nov. are the shell sculpture with several radial grooves, body with well-developed colourful stripes running from the head to tail, and genitalia similar to  Macrochamys  but with an un-coiling epiphallic caecum. The spermatophore has one or two spines near the sperm sac and a spineless tail.

Integrative systematics reveals the new land-snail genus Taphrenalla (Eupulmonata: Ariophantidae) with a description of nine new species from Thailand