Abstract
Pseudopolystoma australensis is redescribed from new material from the Australian lungfish Neoceratodus forsteri (Dipnoi) from a natural population in Queensland, Australia. It is transferred to a new genus, Concinnocotyla, as Concinnocotyla australensis n. comb. in a new subfamily, the Concinnocotylinae. The genus Concinnocotyla differs from all other polystome genera in each of the following characters: haptoral suckers bilaterally symmetrical rather than radially symmetrical, with elaborate skeleton of sclerites rather than no sclerites; hamuli, a single pair between marginal hooklets I and II rather than between II and III; a pocket posteriorly on each caecum that opens dorsally; sperm-filled sac between pockets; testes numerous, discrete, cylindrical; seminal vesicle large, discrete, muscular; penis elongate, muscular, unarmed, extensile; penis-bulb large, muscular, with intrinsic glands; host, a dipnoan. A detailed description of the adult parasite is presented and its unique features are discussed. The absence of a true oral sucker is noted. Confirmation of a polystome from a natural population of Australian lungfish has interesting evolutionary implications.
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