Twenty-one free-living species of turbellaria (Platyhelminthes) were found in the Pacaya-Samiria National Reserve (Loreto, Peru), a Peruvian Amazon floodplain. The total 21 observed taxa comprise five species of Catenulida, two species of Macrostomida, two species of "Lecithoepitheliata", 10 species of Rhabdocoela and two species of Tricladida. Most of the species are cosmopolitan and occur in freshwater habitats worldwide. Of the species collected, only Mesostoma ehrenbergi was previously known from this region, whereas five species of Rhabdocoela were only recently described from the Pacaya-Samiria Reserve. Some morphological, distributional and ecological remarks are provided.
New Species of Gieysztoria (Platyhelminthes, Rhabdocoela) from Peruvian Amazon Floodplain with Description of their Stylet Ultrastructure