Data source: Matti Hämäläinen (2021) Platycnemis sasakii Asahina, 1949 – a distinct species, endemic to Japan (Odonata: Platycnemididae). Odonatologica 50(3/4) 2021: 251-260 https://www.odonatologica.com/wp-content/uploads/2021/12/Odo-50_3-4-Abstracts.pdf