Some new data on the expansion, host-animals, biology and morphology of different developmental stages of the trematode Exorchis oviformis in the southern Prymorye are given. It was revealed, that the first intermediate host of that species is Stenothyra (S.) recondita. Different species of freshwater fishes play a role of a second intermediate host. The definitive host of E. oviformis is a bullhead (Parasilurus asotus).