Theileriidae is a family of
parasite
Parasitism is a Symbiosis, close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the Host (biology), host, causing it some harm, and is Adaptation, adapted str ...
s in the order
Piroplasmida.
It includes the genus ''
Theileria''.
References
Piroplasmida
Apicomplexa families
{{Apicomplexa-stub