The chestnut dunnart (Sminthopsis archeri) is a dunnart that was described by Van Dyck in 1986 and is named because of its chestnut colour in the upperparts of its body. The length from snout to tail is 167–210 mm, of which head to anus is 85–105 mm and tail is 82–105 mm long. The hind foot size is 17–20 mm, ear length is 17–21 mm and weight is 15–20 g.