Do Feathered Dinosaurs Exist? Testing the Hypothesis on Neontological and Paleontological Evidence
JOURNAL OF MORPHOLOGY 266:000–000 (2005) Do Feathered Dinosaurs Exist? Testing the Hypothesis on Neontological and Paleontological Evidence Alan Feduccia,1* Theagarten Lingham-Soliar,2 and J. Richard Hinchliffe3 1Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599-3280 2Department of Zoology, University of KwaZulu-Natal, Westville Campus, Durban 4000, KwaZulu-Natal, South Africa 3Institute of Biological Sciences, University of Wales, Aberystwyth SY23 3DA, United Kingdom ABSTRACT The origin of birds and avian flight from KEY WORDS: feathered dinosaurs; theropod; feather within the archosaurian radiation has been among the most morphogenesis; dromaeosaur; integument; collagen; dig- contentious issues in paleobiology. Although there is general its; frame-shift; limb morphogenesis agreement that birds are related to theropod dinosaurs at some level, debate centers on whether birds are derived “When I use a word,” Humpty Dumpty said in rather a directly from highly derived theropods, the current dogma, scornful tone, “it means just what I choose it to mean — or from an earlier common ancestor lacking suites of derived neither more nor less.” “The question is,” said Alice, anatomical characters. Recent discoveries from the Early “whether you can make words mean so many different Cretaceous of China have highlighted the debate, with things.” “The question is,” said Humpty Dumpty, “which claims of the discovery of all stages of feather evolution and is to be master — that’s all.” —Lewis Carroll, 1871. ancestral birds (theropod dinosaurs), although the deposits Prior to the 1970s birds and dinosaurs were are at least 25 million years younger than those containing the earliest known bird Archaeopteryx.
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