Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Bikonta - bikonts |
| Corticata | |
| kingdom | Chromalveolata Adl et al., 2005 |
| superphylum | Alveolata Cavalier-Smith, 1991 - alveolate |
| phylum | Apicomplexa Levine, 1970 |
| class | Coccidiasina Leuckart, 1879 - coccidia |
| order | Eucoccidiorida Léger & Duboscq, 1910 |
| suborder | Eimeriorina Léger, 1911 |
| family | Cryptosporidiidae Léger,1911 |
| genus | Cryptosporidium Tyzzer,1907 |
| species | Cryptosporidium felis Iseki, 1979 |