additional sourceFaltýnková, A.; Gibson, D. I.; Kostadinova, A. (2008). A revision of Petasiger Dietz, 1909 (Digenea: Echinostomatidae) and a key to its species. <em>Systematic Parasitology.</em> 71 (1): 1–40., available online athttps://doi.org/10.1007/s11230-008-9146-6[details]