Mites of this genus have been found in bird nests, stored food, house dust, bat guano, bracket fungi (Polyporus), and bee nests (Apis spp., and Xylocopa). Dispersing mites have been found on Galagoides demidovii (Prince Demidoff's bushbaby), large flying fox Pteropus vampyrus (a bat), Trirhithrum coffeae (fruit fly of the family Tephritidae), and honey bees (Apis spp.).
Many species found in honey bee nests are generalists also found in other habitats: Glycycometus malaysiensis, Glycycometus molitor, and Glycycometus thailandicus. However, some species have so far been found only in bee nests where they feed on decomposing organic matter in nest cells: Glycycometus geniculatus sensu Vitzthum, Glycycometus rwandae, and Glycycometus combus.
In India, Glycycometus molitor, G. thailandicus, and G. 'orientalis' (nom. nud) have been found in vacated combs, hive debris, brood combs, and dead bees in nests of Apis mellifera and A. cerana. Phoresy on worker bees has been detected in all three species (Sumangala and Haq, 2001). Glycycometus malaysiensis and G. thailandicus have been classified as saprophagous in beehives (Malabanan and Corpuz-Raros, 1998). Glycycometus combus was isolated from stored, damaged comb of Apis florea; these mites were observed to feed actively and reproduce well on the comb material (Chinniah and Mohanasundaram, 1996).