A newborn T

destaca por su cabeza alargada y aplanada con un pico sin dientes que utilizaba para arrancar y triturar la vegetación

is the clear sexual dimorphism

such as fish and other aquatic animals

Tetracynodon tenuis Therizinosaurus A newborn TTetracynodon tenuis was a small therapsid of the cynodont group that lived during the Late Permian Period and possibly briefly survived the mass extinction event that marked the boundary with the Triassic , approximately 252 million years ago. Its fossils have been found in South Africa, a region that has provided much evidence of the transition from mammal like reptiles to the first mammals. Tetracynodon represents one of the earliest cynodonts and