Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Unikonta |
| system | Opisthokonta Cavalier-Smith, 1987 |
| phylum | Choanozoa Cavalier-Smith, 1981 emend. 1983 |
| class | Choanoflagellata Kent, 1880 - choanoflagellates |
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