About the Book
This book consists of articles from Wikia. Pages: 51. Chapters: Carboniferous synapsids, Mammaliaformes, Mammals, Pelycosaurs, Permian synapsids, Prehistoric synapsids of Africa, Prehistoric synapsids of Asia, Prehistoric synapsids of Europe, Prehistoric synapsids of North America, Synapsids of North America, Therapsids, Archaeothyris, Clepsydrops, Edaphosaurus, Haptodus, Ianthasaurus, Adelobasileus, Castorocauda, Docodonta, Eozostrodon, Kuehneotheriidae, Morganucodon, Symmetrodonta, Carnivora, Dryolestida, Eutheria, Evolution of mammals, Hyracodon, Mammal, Parahippus, Prehistoric mammal, Repenomamus, Theria, Triconodonta, Archaeothyris, Clepsydrops, Edaphosauridae, Edaphosaurus, Eupelycosauria, Ianthasaurus, Ophiacodontidae, Pelycosauria, Sphenacodontidae, Synapsida, Varanosaurus, Dimetrodon, Edaphosaurus, Haptodus, Lystrosaurus, Neosaurus, Procynosuchus, Rhopalodon, Secodontosaurus, Sphenacodon, Suminia, Varanosaurus, Anteosaurus, Cynognathus, Lystrosaurus, Thrinaxodon, Cynognathus, Lystrosaurus, Dimetrodon, Edaphosaurus, Estemmenosuchus, Estemmenosuchus mirabilis, Estemmenosuchus uralensis, Haptodus, Neosaurus, Suminia, Angelosaurus, Archaeothyris, Dimetrodon, Edaphosaurus, Haptodus, Ianthasaurus, Placerias, Secodontosaurus, Evolution of mammals, Gorgonops, List of pelycosaurs, List of synapsids, Pelycosauria, Synapsida, Clepsydrops, Gorgonops, Synapsida, Therapsida, Theriodontia. Excerpt: Archaeothyris was a very early mammal-like reptile, which lived in the late Carboniferous period. Dated to 306 million years ago, it is the oldest undisputed synapsid known. It was found in Nova Scotia, at the same locality as Hylonomus, and Petrolacosaurus, all of which resemble Archaeothyris. Archaeothyris belonged to the family Ophiacodontidae, a group of early pelycosaurs that evolved early in the Late Carboniferous. It is thus seen as the precursor of all synapsids (which include mammals). Unlike Hylonomus and its kin, Archaeothyris was relatively large, measuring 50 ...
