Pilsbryoconcha exilis (Lea, 1838)

A non-native population of

P. exilis View in CoL

was discovered in the downstream section of the Ayeyarwady River   GoogleMaps , Myanmar ( Figure 1 View Figure 1 ). In particular, its sample (3 living specimens and 7 recently dead shells; lot RMBH biv1557 ) was collected on 15 February 2024 from an irrigation canal near Shwe Taung Hmaw Village, 16.6390°N, 95.4175°E ( Figures 2-3 View Figure 2 View Figure 3 ) GoogleMaps . Additionally, one empty shell of this alien species was sampled on 14 February 2024 from an irrigation canal near the Yelegale Police Station, 16.7317°N, 95.5284°E. Intensive searching efforts of our team and local villagers failed to find any living specimen from the latter locality. GoogleMaps Both canals are characterized by clay bottom and are connected with the Ayeyarwady River during the rainy season.

Our sample of P. exilis from an irrigation canal near Shwe Taung Hmaw Village is represented by large specimens, the approximate age of which ranges from 2 to 5 years ( Table 1 View Table 1 and Figure 2 View Figure 2 ). The   GoogleMaps three sequenced specimens from Myanmar belong to a single COI haplotype ( Figure 4 View Figure 4 ). This haplotype is identical to that recorded from a pond in the Luang River basin, Mekong Drainage, Udon Thani Province, Thailand (17.4544°N, 102.8772°E; COI acc. No OP589076 ) (Appendix 1). GoogleMaps