The procolophonids - stubby herbivorous lizards, were also very common. The rivers, ponds and lakes were populated by large temnospondyls, of which the Capitosauria were frequently one or two meters in length (the great Mastodonsaurus may have reached four or five meters), and Ceratodan lungfish were also common. In the seas were an unprecedented diversity of marine reptiles - the dolphin-like ichthyosaurs, the lizard-like pachypleurosaurs and thalattosaurs, the