Order: Ploimida
Hele 16 familier med rundt 250 arter er registrert i Norge. Noen arter er planktoniske, mens andre kan krype rundt på substratet.
Systematics :
| Kingdom | Animals (Animalia) | |||||
| Phylum | Hjuldyr (Rotifera) | |||||
| Order | Ploimida | |||||
| Family | Asplanchnidae | |||||
| Genus | Asplanchna | |||||
| Species | Asplanchna priodonta | |||||
| Family | Brachionidae | |||||
| Genus | Argonotholca | |||||
| Species | Argonotholca foliacea | |||||
| Genus | Brachionus | |||||
| Genus | Euchlanis | |||||
| Genus | Kellicottia | |||||
| Species | Kellicottia longispina | |||||
| Genus | Keratella | |||||
| Species | Keratella cochlearis | |||||
| Species | Keratella hiemalis | |||||
| Species | Keratella quadrata | |||||
| Species | Keratella serrulata | |||||
| Species | Keratella testudo | |||||
| Genus | Platyias | |||||
| Species | Platyias quadricornis | |||||
| Family | Gastropodidae | |||||
| Genus | Gastropus | |||||
| Family | Synchaetidae | |||||
| Genus | Polyarthra | |||||
| Genus | Synchaeta | |||||
| Family | Trichocercidae | |||||
| Genus | Trichocerca | |||||
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