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16 – FOSSILS MAMMAL

MAMMAL-LIKE REPTILES

Fossil pelycosaur tracks, left by a Dimetrodon on Paleozoic mud flats of the Abo Formation, Las Cruces, New Mexico, USA. The 14 cm footprints belonged to a young adult approximately 6.5 feet long and weighing 200 pounds. These are some of the oldest known fossilized footprints in the world. Specimen courtesy of Jerry MacDonald, Paleozoic Trackways Project, sponsored by the Smithsonian Institution and Carnegie Museums of Natural History. Please include specimen-courtesy-of credits in publications along with credit to the photographer. — wm_UNM-0647_pelycosaur-fossil-tracks.jpg

Reconstructed fossil skeleton of an early Permian pelycosaur, Edaphosaurus boanerges, found in the Bell Plains Formation, Lake Kickapoo, Archer County, Texas, USA. This individual was approximately 8 feet in length from head to the tip of its tail. Edaphosaurs were herbivorous reptiles that lived in wet swampy areas during the late Carboniferous and early Permian periods, well before dinosaurs evolved. Pelycosaurs were primitive synapsid reptiles, presumably ancestors of the therapsids, which led to mammals. Like Dimetrodon, Edaphosaurus was a sailback, and its sail is believed to have functioned in thermoregulation and possibly display. Specimen courtesy of Raimund Albersdoerfer, Germany, and Henry Galliano, New York, USA. (please include specimen credits in publications with credit to the photographer). — wm_UTX-0206_Permian-pelycosaur-skeleton.jpg

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