The oribatid mite genus Crassoribatula is recorded in the Neotropical region for the first time. One new arboreal species—Crassoribatula biobioensissp. nov.—is described from twigs of olivillo tree in Chile; it differs from the type species—Crassoribatula maculosa—by the length of exobothridial and notogastral setae. The tritonymphal instar of the new species is described (the first data on juveniles in this genus). The systematic placement of Crassoribatula is discussed, resulting in transfer from Oribatulidae (Oripodoidea) to Maudheimiidae (Ceratozetoidea). A revised generic diagnosis for Crassoribatula is presented.