Dugesia circumcisa A sagittal section of holotype YWSZ2, showing bursal canal and copulatory bursa B sagittal section of holotype YWSZ2, showing opening of the right vas deferens into seminal vesicle, and two diaphragms C transverse section of paratype YWSZ11, showing left vas deferens, seminal vesicle, and ejaculatory duct D transverse section of paratype YWSZ11, showing right vas deferens E sagittal section of holotype YWSZ2, showing ejaculatory duct F sagittal section of holotype YWSZ2, showing small nozzle at tip of penis papilla G sagittal section of paratype YWSZ9, showing small nozzle at tip of penis papilla and the duct connecting male and common atrium H horizontal section of paratype YWSZ12, showing small nozzle at tip of penis papilla. Abbreviations: bc: bursal canal; ca: common atrium; cb: copulatory bursa; d: diaphragm; ed: ejaculatory duct; go: gonopore; lvd: left vas deferens; ma: male atrium; no: nozzle; ph: pharynx; pp: penis papilla; rvd: right vas deferens; sv: seminal vesicle. Scale bars: 100 μm.