Morphological and molecular data for larval stages of four species of Petasiger Dietz, 1909 (Digenea: Echinostomatidae) with an updated key to the known cercariae from the Palaearctic

1. Selbach, C.
2. Soldánová, M.
3. Georgieva, S.
4. Kostadinova, A.
5. Kalbe, M.
6. Sures, B.