Abstract

Five new didymozoid trematodes are described from two species of platycephalid fish collected in Moreton Bay, Australia. Indodidymozoon moretonensis sp. n. from the buccal cavity and branchial arches and I. suttiei sp. n. from the flesh are described from Platycephalus fuscus. Indodidymozoon lesteri sp. n. from the belly skin, I, pearsoni sp. n. from the eye, and Helicodidymozoon tortor gen. n., sp. n. from the buccal cavity, branchial arches and operculum are described from Platycephalus endrachtensis. The taxonomic composition of the genus Didymozoon is discussed. Five species, D. branchiale, D. brevicolle. D. koti, D. musculi and D. platycephali are moved to Indodidymozoon; the generic diagnosis of Indodidymozoon is revised. One species, D. spirale, and one species from Neometadidymozoon, N. helicis, arc moved to the newly erected Helicodidymozoon. Helicodidymozoon differs from Didymozoon, Indodidymozoon and Neometadidymozoon in the structure of the hindbody which is spirally twisted.

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