Pelycosaur
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Pelycosaur is an older term for basal or primitive Late Paleozoic synapsids, excluding the therapsids and their descendants. Previously, the term mammal-like reptile was used, and Pelycosauria was con
Dimetrodon milleri
Comparison of "pelycosaurian" skulls: 1 sphenacodont, 2 ophiacodont, 3 caseid. The quadratojugale is green, squamosale is red, jugale is blue.
Cotylorhynchus (background), Ophiacodon and Varanops
Eothyris
Dimetrodon
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Dimetrodon is an extinct genus of sphenacodontid synapsid that lived during the Cisuralian to early Guadalupian epoch of the Permian period, around 294.1–271 million years ago. With most species measu
Pelycosaur
…were quite large, growing to a length of 3 metres (10 ft) or more, although most species were much smaller. Well-known pelycosaurs include the genera Dimetrodon, Sphenacodon, Edaphosaurus, and Ophiacodon. Pelycosaur fossils have been found mainly in Europe and North America, although some small, late-surviving…
Dimetrodon incisivum 01
Maxilla of Dimetrodon borealis, the first Dimetrodon fossil to be described
Restoration of Dimetrodon and Edaphosaurus (background), Charles R. Knight, 1897
Restoration of D. giganhomogenes with exposed neural spine tips