Three rare and little known cryptogonimid digeneans from the sciaenid fish Sciaena umbra (L.) in the western Mediterranean

Three species of cryptogonimid digeneans are redescribed from the gut of Sciaena umbra off Corsica. The systematics of the three species, Metadena pauli (Vlassenko, 1931), Paracryptogonimus aloysiae (Stossich, 1885) n. comb. and Anoiktostoma coronatum (Wagener, 1852), are discussed. The latter two species, which have not been reported for more than 100 years, have previously been confused and synonymised with each other. P. aloysiae, which is transferred to Paracryptogonimus from Anoiktostoma, is restricted to the rectum, whereas A. coronatum prefers the pyloric caeca and anterior intestine.