Dugesia majuscula A sagittal section of holotype YHYQ4, showing seminal vesicle, ejaculatory duct, small diaphragm, penis papilla, and copulatory bursa B Sagittal section of holotype YHYQ4, showing seminal vesicle, ejaculatory duct, penis papilla, and copulatory bursa C sagittal section of paratype YHYQ5, showing terminal and dorsal opening of ejaculatory duct D sagittal section of paratype YHYQ9, showing bursal canal and its musculature. The anterior is to the right in A, B, C, D. Abbreviations: bc: bursal canal; cb: copulatory bursa; cm: circular muscles; d: diaphragm; ed: ejaculatory duct; in: intestine; lm: longitudinal muscles; ma: male atrium; pp: penis papilla; sv: seminal vesicle; vd: vas deferens. Scale bars: 100 μm.