Two species of Phyllodistomum Braun, 1899 (Trematoda: Gorgoderidae) from Moreton Bay, Australia.

Two species of the trematode genus Phyllodistomum Braun, 1899 (Gorgoderidae) are reported infecting teleost fishes from Moreton Bay, Queensland, Australia. Phyllodistomum hyporhamphi n. sp. is described from two species of garfishes (Hemiramphidae), Hyporhamphus regularis ardelio (Whitley) and H. australis (Steindachner). The new species differs from other marine species of Phyllodistomum in possessing a forebody length less than half that of the body, a body length to width ratio < 4:1, an oral sucker width to ventral sucker width ratio > 1:1 and < 2:1, 7-9 strong, marginal undulations on each side of the body and large, slightly lobed vitelline masses. Phyllodistomum pacificum Yamaguti, 1951 is reported, for the first time in Australian waters, from Pantolabus radiatus (MacLeay) (Carangidae). The new material agrees closely with the original description of P. pacificum, in Carangoides equula (Temminck & Schlegel) off Hamazima, Mie Prefecture, Japan, although the specimens from Moreton Bay are larger than those of the original description (4,575-5,338 × 1,111-1,328 vs 2,200-3,100 × 570-930 μm). Cetiotrema carangis (Manter, 1947) Manter, 1970 is found to be a synonym of Cetiotrema carangis (MacCallum, 1913) Williams & Bunkley-Williams, 1996 and the species is formally moved to Phyllodistomum as P. carangis (MacCallum, 1913) n. comb. Phylogenetic analyses of 28S rDNA data showed that the six marine species of Phyllodistomum for which molecular data are available form a strongly-supported clade.