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Message * Articles On Permian Synapsids, including Dimetrodon, Edaphosaurus, Suminia, Robertia, Cistecephalus, Diictodon, Bathygnathus, Neosaurus, Ulemosaurus, Dvinia, Tetraceratops, Procynosuchus, Ophiacodon, Haptodus, Ctenospondylus, Sphenacodon - 124413189X - 9781244131897