Class Arachnida
Subclass Acari
Order Acariformes
Suborder Actinedida
Cohort Parasitengonina
Subcohort HYDRACHNIDIAE*
Superfamilies:
Hydrovolzioidea
Hydrachnoidea
Eylaoidea
Hydryphantoidea
Lebertioidea
Hygrobatoidea
Arrenuroidea
*Other terms that have been used to refer to this clade include Hydracarina, Hydrachnellae, Hydrachnida, and Hydrachnidia.