Heliocotyle ewingi sp n. (Monogenea : Monocotylidae) from the gills of Myliobatis australis (Myliobatididae) from Tasmania, Australia

Heliocotyle ewingi sp. n. (Monogenea: Monocotylidae) is described from the gills of Myliobatis australis Macleay, 1881 (Myliobatididae) collected from Norfolk Bay near Hobart, Tasmania, Australia. Neliocotyle ewingi can be di stinguished readily from the only other species in the genus, Heliocotyle k artasi Neifar, Euzet et Ben Hassine, 1999, by the presence of a single pseu doseptum on each of the peripheral loculi except the posteriormost, eyespot s and by the morphology of the male copulatory organ which is a short, stra ight sclerotised tube which lacks a sclerotised accessory piece. The generi c diagnosis is revised to accommodate the new species and the anterior glan ds are discussed.