Overstreetia olsoni n. sp. (Digenea: Zoogonidae) from the Capricorn silverside Atherinomorus capricornensis (Woodland) (Atherinidae) off Heron Island, southern Great Barrier Reef.

A new species, Overstreetia olsoni, is described from Atherinomorus capricornensis off Heron Island on the Great Barrier Reef off Queensland, Australia. It differs from its only known congener in that the enlarged spines of the circum-oral rows are smaller (< or = 4.5 x 3.5 vs < or = 21.5 x 10.5 microm), the sucker-ratio is smaller (1: 0.97-1.01 vs 1:1.8) and the eggs are larger (40-45 x 22-28 vs 34-37 x 17-22 microm).