Flatworms for ID in a freswater tank (thematized about Matano Lake, in Sulawesi, but that's probably irrelevant as the flatworms are almost sure uninvited here). Haus des Meeres/Aqua Terra zoo, Wien, Austria. They look completely white, at least by underside. Any chance to get down to species level please?
Giacinta Angela Stocchino, Ronald Sluys, Renata Manconi
Zookeys
Figure 3.Dugesia bifida. Holotype ZMA V.Pl. 7189.1, sagittal reconstructions of the copulatory apparatus (anterior to the right), A male copulatory apparatus B female copulatory apparatus.