Abstract
Luis CHIAPPE,1' 4 MARK NORELL,2 AND JAMES CLARK3 'Department of Ornithology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA; 2Department of Vertebrate Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA; and 3Department of Biological Sciences, George Washington University, Washington, D.C. 20052, USA
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