A trypanosome and a haemogregarine have been described from frogs. Two species of trypanosomes and 2 of haemogregarines are known from elasmobranchs; 2 trypanosomes, 1 trypanoplasm, and 4 haemogregarines from marine teleosteans; and 2 trypanosomes from freshwater teleosteans. Haemogregarina hemiscyllii from Hemiscyllium ocellatum (Elasmobranchii) and Hg. tetraodontis from Tetraodon hispidus (Teleostei) are new.
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Mackerras et al. (1961) studied this question.