Tasmaniosaurus was about 1 metre long, and similar in appearance to the proterosuchid Chasmatosaurus from Africa and China, which may be its closest relative.[4] It is however distinguished from other proterosuchids by the presence of an interclavicle, which other members had lost. The premaxillae is slightly curved. The teeth are sharp. It may have fed, amongst other creatures, on labyrinthodonts, as remains of these amphibians are associated with the skeleton. It is surmised that many proterosuchids lived an amphibious, predatory life like crocodiles today. Tasmaniosaurus had no dermal scutes. Tasmaniosaurus is one of the earliest reptiles known to have lived in Australia. Another proterosuchid, Kalisuchus rewanensis, is known from the Early Triassic of Queensland, Australia.