Dugesia umbonata, paratype RMNH.VER.19968.a, sagittal sections and reconstructions of the copulatory apparatus. A. photomicrographs showing copulatory bursa, bursal canal, seminal vesicle, diaphragm, penis, male atrium and hump; B. photomicrograph showing copulatory bursa, bursal canal, seminal vesicle, diaphragm, penis, male atrium, common atrium and gonopore; C. photomicrograph showing copulatory bursa, ejaculatory duct, penis, male atrium, common atrium and gonopore; D. reconstruction male copulatory apparatus; E. reconstruction female copulatory apparatus.