Identifier: originevolutiono00osbo (find matches)
Title: The origin and evolution of life, on the theory of action, reaction and interaction of energy
Year: 1917 (1910s)
Authors: Drawing by Richard Deckert, published by Osborn, Henry Fairfield, 1857-1935
Subjects: Evolution Life -- Origin
Publisher: New York, C. Scribner's Sons
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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life, the climax of terrestrial adaptation in thereptilian skeleton is reached among the dinosaurs, a branchwhich separated in late Permian or early Triassic time fromsmall quadrupedal, swiftly moving, lizard-like reptiles andbefore the time of their extinction at the close of the Creta-ceous had evolved into a marvellous abundance and varietyof types. In the Upper Triassic of North America, late New-ark time, the main separation of the dinosaurs into two greatdivisions, (a) those with a crocodile-like pelvis, known asSaurischia, and (b) those with a bird-like pelvis, known as Orni-thischia, had already taken place, and the dinosaurs domi-nated all other terrestrial forms. When Hitchcock in 1836 explored the giant footprints inthe ancient mud flats of the Connecticut valley he quite nat-urally attributed many of them to gigantic birds, since at thetime the law of parallel mechanical evolution between birdsand dinosaurs was not comprehended and the order Dino- CARNIVOROUS DINOSAURS 211
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ANCHISAURUS RHYTIDODON CONNECTICUT TRJASSIC REPTILES Fig. 88. Life of the Connecticut Ri\ er Valley in Upper Triassic (Newark) Time. Anchisaurus, a primitive carnivorous bipedal dinosaur. Rhytidodon, a phytosaur analo-gous but not related to the modern gavials. Stegomus, a small armored phytosaurrelated to Rhytidodon. Anomospus, a herbivorous bipedal dinosaur related to theduckbills or Iguanodonts. Podokcsaurus, a light, swift-moving, carnivorous dino-saur of the bird-like type. Restorations (except Rhytidodon) after R. S. Lull of YaleUniversity. Drawn to uniform scale for the author by Richard Deckert. PHYLOGENY AND ADAPTIVE RADIATION OF THE DINOSAURS UPPER T ^^^~ Y ^ — ... :y -•---: — fc£?£^S ——° ■~—— ..SS,C ™ ._ URS TRIASSIC c°° ■7^ .;^„.,v .„„,.. ^^r:::::. r.3r: ...... Fig. Terrestrial Evolution of the Dlnosaurs. The ancestral tree of the dinosaurs, originating in Lower Permian time, and branchinginto five great lines during a period estimated at twe

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