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Dasyuroidea(infraclass Metatheria; order Marsupialia) A superfamily that comprises the families Dasyuridae, Thylacinidae, and Myrmecobiidae, marsupials in which the marsupium, if present, opens toward the rear. The second and third digits of the hind feet are didactylous, the first is often vestigial or absent and if present is clawless and not opposable. There are three or more pairs of incisors of equal size in upper and lower jaws.