Abstract
Dendromonocotyle urogymni sp. nov. is described from the dorsal surface of the porcupine ray, Urogymnus asperrimus, kept at Cairns Marine Aquarium Fish in Cairns, Queensland, Australia. Dendromonocotyle urogymni can be distinguished most readily from the other 15 species in the genus by the male copulatory organ which has a distinct spherical inflation mid-way along its length. This is the first monocotylid to be described from U. asperrimus.
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