Ornithonyssus

noun

Or·​ni·​thon·​ys·​sus ˌȯr-nə-ˈthän-ə-səs  -thə-ˈnis-əs 

: a genus of mites (family Macronyssidae) that are parasitic on vertebrates and include the rat mite (O. bacoti) and two serious pests (O. bursa and O. sylviarum) of domestic fowl