Dugesiidae is a family of freshwater planarians distributed worldwide (except Antarctica).

[1]: 350 All species of Dugesiidae live in freshwater environments and have a dorsoventrally flattened body.

The main differences between Dugesiidae and other freshwater planarians are related to the anatomy of the eyes and the copulatory apparatus.

[5] According to molecular analyses, Dugesiidae is the sister group of land planarians.

[6][4] Phylogenetic supertree including all major triclad groups after Sluys et al., 2009:[2] Maricola Cavernicola Planariidae Kenkiidae Dendrocoelidae Dugesiidae Geoplanidae Phylogenetic subtree including five dugesiid genera after Álvarez-Presas et al., 2008:[4] Girardia Neppia Cura Schmidtea Dugesia Data related to Dugesiidae at Wikispecies