Lepospondyli

Lepospondyli is a group of small but diverse tetrapods that lived from the Early Carboniferous (Mississippian) to the Early Permian. With the exception of one specimen (Diplocaulus minumus) from Morocco, the fossils of this group are restricted to Europe and North America. None were large (the biggest genus, the diplocaulid Diplocaulus, reached a meter in length, but most were much smaller), and they are assumed to have lived in specialized ecological niches not taken by the more numerous temnospondyl amphibians. For more information, visit the Wikipedia entry Get back to Amphibia
Diplocaulus

Diplocaulus

phylum	Chordata	Diplocaulus is an extinct genus of lepospondyl amphibian from the Permian period of North America. It is one of the largest lepospondyls, with a distinctive boomerang-shaped skull. Diplocaulus had a stocky, salamander-like body, but was relatively large, reaching up to 1 metre (3.3 ft) in length. Its most distinctive features were the long protrusions on the sides of its skull, giving the head a boomerang shape. Judging from its weak limbs and relatively short tail, it is presumed to have swum with an up-and-down movement of its body, not unlike cetaceans today. For more information, visit the Wikipedia entry. Get back to Lepospondyli
class	Amphibia
family	Nectridea
genus	Diplocaulus
Temporal range	299–251Ma