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Coelosaurus antiquus
"Coelosaurus" ''antiquus'' ("antique hollow lizard") is a species of theropod dinosaurs. It was named by Joseph Leidy in 1865 for two tibiae found in the Navesink Formation of New Jersey.
This species was later reclassified as a member of the genus ''Ornithomimus'' in 1979 by Donald Baird and John R. Horner as ''Ornithomimus antiquus'',〔Baird D., and Horner, J., 1979, "Cretaceous dinosaurs of North Carolina", ''Brimleyana'' 2: 1-28〕 and this was followed by some later researchers.〔Sullivan, (1997). "A juvenile ''Ornithomimus antiquus'' (Dinosauria: Theropoda: Ornithomimosauria), from the Upper Cretaceous Kirtland Formation (De-na-zin Member), San Juan Basin, New Mexico." ''New Mexico Geological Society Guidebook, 48th Field Conference, Mesozoic Geology and Paleontology of the Four Corners Region''. 249-254.〕 However, others have not followed this classification, and have noted that there is no justification for the classification of the New Jersey specimens in a genus known only from western North America. David Weishampel in 2004 considered "C." ''antiquus'' to be indeterminate among ornithomimosaurs, and therefore a ''nomen dubium''.〔Weishampel, D.B. (2004). "(Another Look at the Dinosaurs of the East Coast of North America. En (Colectivo Arqueológico-Paleontológico Salense, Ed.). )" ''Actas de las III Jornadas sobre Dinosaurios y su Entorno.'' 129-168. Salas de los Infantes, Burgos, España.〕
In 1979, Baird and Horner discovered that the name "Coelosaurus" was preoccupied by another dubious taxon (based on a single vertebra), named ''Coelosaurus'' by an anonymous author now known to be Richard Owen in 1854.〔
==See also==
* Timeline of ornithomimosaur research
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