Euzetrema caucasica sp. n. (Monogenea, Polyopisthocotylidea), a parasite of the Caucasian salamander]

A new species of monogeneans, Euzetrema caucasica sp. n., from the urinary bladder of Mertensiella caucasica (Waga, 1876) is described. The new species differs from E. knoepffleri Combes, 1965 by greater sizes of the disc, median and marginal hooks and anterior suckers. Certain suggestions are made on the biology and life cycle of Euzetrema.