"Coelosaurus" antiquus
Temporal range: Late Cretaceous, 70–66 Ma
Scientific classification

C. antiquus
Binomial name
"Coelosaurus" antiquus
Leidy, 1865

Ornithomimus antiquus
(Leidy, 1865)

"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.

Drawing of a tibia.

This species was later reclassified as a member of the genus Ornithomimus in 1979 by Donald Baird and John R. Horner as Ornithomimus antiquus,[1] and this was followed by some later researchers.[2] 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.[3]

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.[3]

Ornithomimid material known from the Severn Formation of Maryland and the Mooreville Chalk and Blufftown formations of Alabama and Georgia have also been assigned to this species.[4]

See also


  1. ^ Baird D., and Horner, J., 1979, "Cretaceous dinosaurs of North Carolina", Brimleyana 2: 1–28
  2. ^ 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.
  3. ^ a b Weishampel, D.B. (2004). "Another Look at the Dinosaurs of the East Coast of North America. En (Colectivo Arqueológico-Paleontológico Salense, Ed.). Archived 2012-09-04 at the Wayback Machine" Actas de las III Jornadas sobre Dinosaurios y su Entorno. 129–168. Salas de los Infantes, Burgos, España.
  4. ^ Brownstein, Chase D. (2018-02-08). "The biogeography and ecology of the Cretaceous non-avian dinosaurs of Appalachia". Palaeontologia Electronica. 21 (1): 1–56. doi:10.26879/801. ISSN 1094-8074.