Archaeothyris is a synapsid from the Late Carboniferous Period of Canada.

AMNIOTE • ANIMAL SCALE • ANIMAL TAIL • ANIMAL THEMES • ANIMAL • ARCHAEOTHYRIS FLORENSIS • ARCHAEOTHYRIS • ARTWORK • CARBONIFEROUS PERIOD • CARBONIFEROUS • CARNIVORE • COLOR IMAGE • COPY SPACE • CREATURE • CRETACEOUS • CUTOUT • DIAPSID • DIGITALLY GENERATED IMAGE • EVOLUTION • EXTINCT • FULL LENGTH • GREEN • HETTANGIAN • HORIZONTAL • ILLUSTRATION • INSECTIVORE • JURASSIC • LATERAL VIEW • LIZARD • MAMMAL • MESOZOIC ERA • MORPHOLOGY • NATURAL HISTORY • NATURAL SCIENCES • NATURE STUDY • NO PEOPLE • ONE ANIMAL • OPHIACODONTIDAE • PALAEONTOLOGY • PALAEOZOOLOGY • PALEONTOLOGY • PALEOZOOLOGY • PAST • PELYCOSAUR • PLIENSBACHIAN • PREHISTORIC ERA • PRIMEVAL • PRIMITIVE • PRIMORDIAL • REPTIL • REPTILE • REPTILES • RHYNCHOCEPHALIA • SAUROPSID • SCIENCE • SCIENCE: EVOLUTION • SIDE VIEW • SMALL • SPECIES • SPHENODONTIA • SPIKED • SYNAPSID • TETRAPOD • TINY • TOUGHNESS • TRIASSIC • TUATARA • VERTEBRATE • WHITE BACKGROUND • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY