Protoopalina hylarum is a species of protozoa in the Opalinidae family, and an amphibian parasite.[1] It was first described in 1911 by Janet W. Raff as Opalina hylarum.[1]
This parasite has been found in the green and golden bell frog Litoria aurea, but has also been reported in the Cane toad (Rhinella marina).