Shells of Perrottetia spp. A Perrottetia dugasti lectotype MNHN-IM 200030867 B Perrottetia mabillei syntype MNHN-IM 200030874 CPerrottetia daedaleus var. major syntype MNHN-IM 200030871 D Perrottetia messageri syntype MNHN-IM 200030875 E Perrottetia aquilonaria specimen CUMZ 6278 from Xayabouly with apertural dentition F, G Perrottetia unidentata sp. n. F holotype CUMZ 6281 with apertural dentition and G paratype CUMZ 6282 H, I Perrottetia unidentata sp. n. specimens from Tam Than Kaisone H specimen with upper palatal CUMZ 6284 and I specimen without upper palatal CUMZ 6285.