Oviraptor philoceratops

Oviraptor philoceratops was a small oviraptorid theropod from the Djadokhta Formation of Mongolia. Its short, deep and highly air-filled skull ended in a strong toothless beak, while long arms and grasping hands gave it a birdlike silhouette. The species is much less completely known than popular reconstructions imply: only the crushed partial holotype AMNH FR 6517 can be assigned confidently. The tall-crested skeletons and classic spread-wing brooding adults often labeled Oviraptor are mostly specimens of Citipati or other oviraptorids.

Its fossils occur between approximately 75 and 71 million years ago. Values shown here are approximate and reflect the current curated seed dataset.

The holotype preserves a badly crushed skull and jaws, part of the neck and trunk, shoulder girdle, furcula, forelimbs and portions of the hands and foot. Its skull was short and deep with a toothless beak and extensive internal air spaces. A large cassowary-like crest is not preserved; the top of the skull is too incomplete to establish its exact profile. Missing hips, hind limbs and tail in full-body restorations are reconstructed mainly from close oviraptorid relatives. Feathers are strongly inferred from feathered and pygostyle-bearing oviraptorosaurs, but no feather impression belongs directly to O. philoceratops.

• Short, deep and extensively pneumatic skull
• Strong toothless beak with a deep lower jaw
• Furcula connecting the shoulder girdle
• Long grasping forelimbs with three clawed fingers
• Bipedal body plan reconstructed from close oviraptorid relatives
• Probable feathered wings and body covering inferred phylogenetically
• Crest height uncertain because the skull roof is incompletely preserved

George Olsen found AMNH FR 6517 at Bayn Dzak—the Flaming Cliffs—during Roy Chapman Andrews’s 1923 Central Asiatic Expedition. The skeleton lay directly above egg nest AMNH FR 6508, then thought to belong to the abundant Protoceratops. Henry Fairfield Osborn named Oviraptor philoceratops in 1924, interpreting it as an egg seizer ‘fond of ceratopsian eggs’ while acknowledging the name could prove misleading. In 1994 an embryo inside the same general egg type was identified as an oviraptorid, and later Citipati adults preserved in true brooding postures confirmed birdlike incubation in the family.

Discovery credit: George Olsen, Roy Chapman Andrews.

Naming authors: Henry Fairfield Osborn.

The Djadokhta Formation preserves a semi-arid landscape of wind-blown dunes, sandy flats and intermittent water sources. Sudden dune collapse and sandstorms could bury animals rapidly. Oviraptor shared the Flaming Cliffs ecosystem with Protoceratops, Velociraptor, small mammals, lizards and other birdlike theropods.

The nest association makes parental attendance a better explanation than specialized egg theft, especially after oviraptorid embryos were found in matching eggs. However, the holotype is not preserved in the classic symmetrical brooding posture seen in later Citipati specimens. Diet remains unresolved: a powerful toothless beak could process tough vegetation, seeds, small animals, shellfish or mixed foods. Current evidence supports herbivory or omnivory more readily than an egg-specialist diet, but it cannot exclude opportunistic egg eating.

• Osborn warned in 1924 that Oviraptor’s dramatic name might give an entirely false impression of its feeding habits.
• The discovery of an oviraptorid embryo in a matching egg type helped exonerate the supposed egg thief seventy years later.
• Most tall-crested ‘Oviraptor’ skeletons in older books are based on Citipati-like animals, not the Oviraptor holotype.
• AMNH FR 6517 remains the only specimen that can be assigned confidently to O. philoceratops.

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1. 01
   The Paleobiology Database

   Open source
2. 02
   Three new Theropoda, Protoceratops zone, central Mongolia

   Henry Fairfield Osborn · American Museum Novitates 144 · 1924

   Open source
3. 03
   Cranial Anatomy of Citipati osmolskae and a Reinterpretation of the Holotype of Oviraptor philoceratops

   James M. Clark, Mark A. Norell, Timothy Rowe · American Museum Novitates · 2002

   Open source
4. 04
   A Theropod Dinosaur Embryo and the Affinities of the Flaming Cliffs Dinosaur Eggs

   Mark A. Norell, James M. Clark, Demberelyin Dashzeveg and 6 coauthors · Science · 1994

   Open source
5. 05
   A nesting dinosaur

   Mark A. Norell, James M. Clark, Luis M. Chiappe, Demberelyin Dashzeveg · Nature · 1995

   Open source
6. 06
   Oviraptor philoceratops holotype FR 6517

   American Museum of Natural History, Division of Paleontology

   Open source
7. 07
   Dinosaur Eggs

   American Museum of Natural History

   Open source
8. 08
   Follow the Fossil Specimen: the ‘Big Mamma’ nesting oviraptorid

   American Museum of Natural History

   Open source