This is a species-rich genus, containing both bee-associated and non bee-associated mites. Except for a key to Palaearctic species (Khaustov, 2008), no other keys are available. There are five species associated with bees. Four species associated with bumble bees (Scutacarus acarorum, S. deserticolus, S. mendax, and S. occultatus) can be identified using Jagersbacher-Baumann, 2014 and Khaustov, 2008. The remaining species, Scutacarus eickworti, from halictid bees in the USA, can be identified using Delfinado and Baker, 1978.