A new species, Pretestis laticaecum, (Trematoda : Cladorchiidae), from Emydura krefftii Gray, 1871 (Pleurodira : Chelidae) from Central Queensland, Australia

Pretestis laticaecum is described from the small intestine of the freshwate r turtle Emydura krefftil. The new species can be distinguished from its co ngener P. australianus by the following characters; significantly smaller o vary, main lymph vessels reach anterior to posterior testis, genital atrium in mid-oesophageal region, small vitelline follicles clumped around the ov ary and significantly larger caeca overlapping. The, position of this speci es and related genera in fish, the life cycle of P. australianus and the pr esence of P. laticaecum in turtles suggest that it is a relatively recent h ost capture.