Lund's amphibious rat is a semiaquatic rodent of southeastern South America. Its tail is longer than its head and body, and the hind feet have webbing with silvery fringes.
The tail is longer than the head and body. The large hind feet are webbed and edged with silvery hairs.
It is nocturnal and semiaquatic. Field notes include animals sheltering beneath reeds and swimming.
An extinction-risk assessment has not been added yet.