Hydrachnidae

plural noun
Hy·drach·ni·dae | \-nəˌdē\

Definition of Hydrachnidae 

in some classifications

: a large family of water mites (group Hydrachnellae) that includes all the common free-living mites of fresh water and a few parasites of the gills of mollusks and that is now usually broken up into numerous separate families

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History and Etymology for Hydrachnidae

New Latin, from Hydrachna, type genus (from hydr- + Greek achna, achnē foam, chaff) + -idae

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