Prionosuchus
Prionosuchus lived in a humid and tropical environment as indicated by the petrified forest of the Pedra do Fogo formation in which the fossil was found. The strata of siltstones, shales and limestones were deposited in lagoonal and fluvial environments. Other animals discovered in the same rocks include fish (primitive sharks, palaeoniscids, and lungfish) and amphibians.