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Nimbacinus richi lived during the middle Miocene and has been found in deposits in Bullock Creek in the northern territory.
N. richi is distinguished from Nimbacinus dicksoni from a well preserved holotype right dentary on the basis of dental morphology.
N. richi was a carnivorous, quadrupedal marsupial in Australia. In appearance it resembled a dog with a long snout. Its molar teeth were specialized for carnivory; the cups and crest were reduced or elongated to give the molars a cutting blade.