The swamp antechinus is a small marsupial of wet grasslands and scrub on Tasmania and islands in Bass Strait. It is most active around dusk.
Its back is gray-brown and its underside is paler; the tail is shorter than the body. Fur color ranges from dark gray to brown.
It is most active at dusk but may also be active by day. It eats insects, spiders, worms, and small vertebrates and usually lives alone.
An extinction-risk assessment has not been added yet.