Ampullaria pesmei Pila pesmei Annotated checklist of freshwater molluscs from the largest freshwater lake in Southeast Asia Ng, Ting Hui Jeratthitikul, Ekgachai Sutcharit, Chirasak Chhuoy, Samol Pin, Kakada Pholyotha, Arthit Siriwut, Warut Srisonchai, Ruttapon Hogan, Zeb S. Ngor, Peng Bun ZooKeys 2020 958 107 141 7SQ2C 0763C0E4-6C56-5B34-B1B1-64E7325ABBA1 (Morlet, 1889) Morlet 1889 Gastropoda Ampullariidae Pila CoL Animalia Pila pesmei Architaenioglossa 0 107 Mollusca species pesmei   Ampullaria pesmeiMorlet, 1899: 185, pl. 8, fig. 2. Type locality: "Phnom-Penh (Cambodge)".  Pila pesmei: Brandt 1974: 51, pl. 5, figs 70, 71.  Material examined. ZRC.MOL.015671.  Distribution and habitat. Tonle Sap open area (locality no. 38).  Remarks. Although  Pila pesmeiis widely distributed in Eastern and Northeastern Thailand ( Ng et al. in press), the species does not appear to be as widespread as  Pila gracilisin the Tonle Sap basin, especially during the dry season when our surveys were conducted. It is also uncertain if the species is still extant at its type locality of Phnom Penh.  Pila pesmeiis harvested in abundance from the Tonle Sap Lake in the rainy season, with more than 380 tonnes recorded at five commercial landing sites in Kampong Chhnang Province within one year (as  Pila ampullacea(Linneaus, 1758) in Ngor et al. 2016, 2018d).  Pila pesmeimay be confused with  Pila gracilisowing to morphological similarity among some populations ( Ng et al. in press), and further extensive examination of both species in Cambodia would be necessary to resolve the true distribution of both species in the country. The  Pila pesmeimorph from Tonle Sap Lake have relatively flat spires, compared to those in Thailand ( Ng et al. in press), and appear to also be found in Southern Vietnam (as  Pila erythrochila(Dautzenberg & Fischer, 1905) in Ng et al. 2019).