Diarthrognathus was a genus of mammal-like reptiles, known from fossil evidence found in South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

. The Diarthrognathus is of interest as it possesses a jaw structure that is similar to both mammals and reptiles, with a reptilian joint between the quadrate and articular in addition to the mammalian joint between the squamosal and dentary bones .