Trombidiidae

noun plural

Trom·​bi·​di·​idae ˌträm-bə-ˈdī-ə-ˌdē 

: a family of mites that now includes only forms that feed in all stages on other arthropods but formerly included mites whose larvae are chiggers and which are now included in the family Trombiculidae

trombidiid

-ˈbid-ē-əd 

adjective or noun