Figure 4 from: Stocchino G, Sluys R, Deri P, Manconi R (2013) Integrative taxonomy of a new species of planarian from the Lake Ohrid basin, including an analysis of biogeographical patterns in freshwater triclads from the Ohrid region (Platyhelminthes, Tricladida, Dugesiidae). ZooKeys 313: 25-43. https://doi.org/10.3897/zookeys.313.5363

Figure 4 - Dugesia superioris. Photomicrographs of the copulatory apparatus. A Holotype ZMA V.Pl. 7153.1, sagittal section showing the penis bulb and the penis papilla with the ejaculatory duct B Paratype CGAS Pla 6. 3, transverse section of the penis papilla and the ejaculatory duct surrounded by numerous glands C Paratype CGAS Pla 6. 3, transverse section of the bursal canal.