Clemacotyle australis (Monogenea: Monocotylidae) from the white-spotted eagle ray Aetobatus narinari (Rajiformes: Myliobatididae) on the Great Barrier Reef: redescription, emended generic diagnosis, and oncomiracidium.

Clemacotyle australis Young, 1967 from the branchial cavity of the type host, Aetobatis narinari, is redescribed based on new material from the type locality, Heron Island, Queensland, Australia. The generic diagnosis is emended to include details of the male copulatory complex. Oncomiracidia, hatched from eggs collected from C. australis, are noteworthy in the presence of diffuse pigment throughout the body and haptor.