Map showing the sampling localities for Korean Siphonaria examined in this study. 1 Daejin-ri, Hyeonnae-myeon, Goseong-gun, Gangwon-do; 2 Jeonjin-ri, Ganghyeon-myeon, Yangyang-gun, Gangwon-do; 3 Namae-ri, Hyeonnam-myeon, Yangyang-gun, Gangwon-do; 4 Namyang-ri, Seo-myeon, Ulleung-gun, Gyeongsangbuk-do; 5 Dokdo-ri, Ulleung-eup, Ulleung-gun, Gyeongsangbuk-do; 6 Jukbyeon-ri, Jukbyeon-myeon, Uljin-gun, Gyeongsangbuk-do; 7 Guryongpo-eup, Nam-gu, Pohang-si, Gyeongsangbuk-do; 8 Gujora-ri, Irun-myeo, Geoje-si, Gyeongsangnam-do; 9 Mendehaean-gil, Tongyeong-si, Gyeongsangnam-do; 10 Gahak-ri, Jisan-myeon, Jindo-gun, Jeollanam-do; 11 Seopo-ri, Deokjeok-myeon, Ongjin-gun, Incheon; 12 Jeju-si Samyang 1(il)-dong, Jeju-do; 13 Seongsan-eup, Seogwipo-si, Jeju-do; 14 Andeok-myeon, Seogwipo-si, Jeju-do. Circles with multiple colours represent localities where the corresponding species were found together.