Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
HOVASAURUS BOULEI
Eureptilia-Diapsida-Neodiapsida-Younginiformes
Above: picture of Hovasaurus tail, showing the expansion of neural and haemal spines that indicate an aquatic or semi-aquatic lifestyle. From the Lower Sakamena Formation - Madagascar. Upper Permian.