Three new species of Polyclithrum Rogers, 1967 (Gyrodactylidae : Monogenea) from mugilid fishes from Australia and Brazil, with a redescription of P-mugilini Rogers, 1967

Polyclithrum mugilini Rogers, 1967, a parasite of Mugil cephalus Linnaeus, is redescribed from type-material from Lake Seminole, Georgia, USA. Three n ew species of Polyclithrum Rogers, 1967 are also described: P. alberti n. s p. from M. cephalus from the Albert River, Queensland, Australia; P. boeger i n. sp. from M. platanus Gunther from Rio da Guarda, State of Rio de Janei ro, Brazil; and P. corallense n. sp. from M. cephalus from Heron Island, Gr eat Barrier Reef, Australia. The four species can be distinguished by the s ize and shape of haptoral sclerites, but in particular by accessory bar num ber 3, the dorsal bar, the marginal hooks and the hamulus point to shaft an gle. The validity of Micropolyclithrum parvum Skinner, 1975, a parasite of M. cephalus in Biscayne Bay, Florida, is discussed, and a key to the specie s of Polyclithrum is presented.