Abstract
Sporocysts from tiger snakes (N. ater) produced thick-walled sarcocysts in laboratory rats (Rattus norvegicus). Ultrastructurally these organisms were identical with sarcocysts found in native rats, but were different from Sarcocystis singaporensis. S. murinotechis sp. nov. is proposed for this parasite of rodents and tiger snakes. When naturally-infected rats were fed to kittens (Felis domestica), quolls (Dasyurus viverrinus) and a masked owl (Tyto novaehollandiae) no sporocysts were detected in the feces of these animals. Sporocysts from owls (T. novaehollandiae and Ninox novaeseelandiae) were not infective for rats (R. norvegicus).

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