| Infraorder | Hydrachnellae (a subclass of water mites) |
| Suborder | HYDRACHNIDIA (water-mites) |
| Order | TROMBIDOIDEA (an order of Prostigmatid mites) |
| Suborder | PROSTIGMATA (sucking mites) |
| Order | TROMBIDIFORMES (trombidiform mites) |
| Superorder | ACARIFORMES (acariform mites) |
| Subclass | ACARI (mites) |
| Class | ARACHNIDA (mites, spiders, false scorpions, harvestmen etc.) |
| Subphylum | CHELICERATA (a subphylum of arthropods) |
| Phylum | ARTHROPODA (arthropods) |
| Superphylum | ECDYSOZOA (skin shedders) |
| Clade | Bilateria (bilaterally symmetrical animals) |
| Subkingdom | EUMETAZOA (metazoans) |
| Kingdom | ANIMALIA (animals) |
| Domain | Eukaryota (eukaryotes) |
| Life | BIOTA (living things) |
Hydrachnellae (a subclass of water mites) may be included in identification literature listed under the following higher taxa:
| Author | Year | Title | Source |
|---|---|---|---|
| Gledhill, T. & Viets, K.O. | 1976 | A synomic and bibliographic Checklist of the Freshwater Mites (Hydrachnellae and Limnohalacaridae, Acari) recorded from Great Britain and Ireland | Occasional Publications, No 1, 59pp, Freshwater Biological Association |
| Zawal, A. | 2002 | Parasitism of water mite larvae (Hydrachnellae) of the genus Hydrachna on water beetles in Poland | Acarologia Vol 42 (4): 361-370. |
Literature listed under the following higher taxa may also be relevant to Hydrachnellae (a subclass of water mites):
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