Parasites of the green treefrog, Hyla cinerea, from Orange Lake, Alachua County, Florida, USA

Four species of parasites (1 trematode, 2 nematodes, and 1 protozoan) were identified from 60 green treefrogs, Hyla cinerea (Schneider), collected in north-central Florida, U.S.A. The most prevalent parasites were the nematod e Cosmocerella haberi (Steiner) Baker and Adamson (23%) and the protozoan O palina sp. Purkinje and Valentin (47%). The trematode, Clinostomum attenuat um Cort, had a prevalence of 2%, and the other nematode, Rhabdias sp. Stile s and Hassall, had a prevalence of 5%. Seven females and seven males were i nfected with C. haberi. The prevalence and intensity of C. haberi were corr elated positively with host size (wet weight and snout-vent length). There was no statistically significant difference between gender and intensity of C. haberi infection. Fourteen females and 14 males were infected with Opal ina sp. The prevalence of Opalina sp was correlated negatively with host si ze. Both C. haberi and Opalina so. have been reported previously from II. c inerea. The green treefrog represents a new host record for C. attenuatum a nd Rhabdias sp.