The holotrichous condition for the idiosomal chaetotaxy of Zerconidae is reviewed. Using ontogenetic patterns of body setation of holotrichous taxa in other families of Gamasina for comparison, the homologies and notation for some of the podonotal and opisthosomal setae of zerconid mites are changed. These modifications lead to new interpretation of some of the apomorphic attributes used to characterize the family Zerconidae and superfamily Zerconoidea. The caudodorsal displacement of a pair of opisthogastric setae, JV5, so as to appear to be captured by the opisthonotal shield in deutonymphs and adults, is seen to be a unique characteristic of Zerconoidea. The caudal coalescence of the opisthonotal and opisthogastric shields, and the anterior displacement of setae J5 to a nearly transverse alignment with setae Z4 well ahead of the caudal body margin, characterize Zerconidae.