The grey-bellied dunnart (Sminthopsis griseoventer), alternately spelled gray-bellied dunnart, was described by the same people Kitchener, Stoddart and Henry along with the Kangaroo Island dunnart, Gilbert's dunnart and little long-tailed dunnart in 1984. They also described the Mallee ningaui in 1983. The average body length of a specimen can vary between 130–192 mm with a tail of 65–98 mm and body to anus of 65–95 mm. The olive grey ears have a length of between 17–18 mm. The hind feet have an average length of between 16–17 mm. Its weight varies between 15-25 grams.