Hydrachnidae
plural noun
Hy·drach·ni·dae
-nəˌdē
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
Word History
Etymology
New Latin, from Hydrachna, type genus (from hydr- + Greek achna, achnē foam, chaff) + -idae