| image = Dimetrodon.jpg | image_width = 250px | image_caption = Dimetrodon grandis skeleton at the National Museum of Natural History | regnum = Animalia | phylum = Chordata | superclassis = Tetrapoda | classis = Synapsida | ordo = Pelycosauria * | ordo_authority = Cope, 1878 | subdivision_ranks = Suborders | subdivision = †Caseasauria Eupelycosauria }} The pelycosaurs (from Greek πηλυξ, pelyx meaning 'bowl' and σαυρος, sauros meani… (More on Pelycosaur)