Empruthotrema quindecima sp n. (Monogenea : Monocotylidae) from the nasal fossae of Taeniura lymma (Dasyatididae) from Heron Island and Lizard Island, Great Barrier Reef, Queensland, Australia

Empruthotrema quindecima sp. n. (Monogenea: Monocotylidac) is described fro m the nasal fossae of the blue-spotted fantail ray Taeniura lymma (Forsskal , 1775) collected aom the reef flats of Heron Island and Lizard Island loca ted at the southern and northern sections, respectively, of the Great Barri er Reef in Queensland, Australia. Empruthotrema quindecima has 15 marginal oculi on the haptor which distinguishes it from the other five members of t he genus which have either 13 or 14 marginal loculi. The generic diagnosis of Empruthotrema Johnston et Tiegs, 1922 is amended to accommodate the new species, a key to species is provided and the evolution of the different co nfigurations of the haptoral loculi within the genus is discussed.