Oviraptorosauria
Feathered dinosaurs with parrot-like skulls from the Cretaceous.
Gary Todd · CC0
Oviraptorosauria is a group of feathered, bipedal maniraptoran dinosaurs from the Cretaceous Period of Asia and North America. They are notable for their short, beaked, parrot-like skulls, with or without bony crests, and range in size from turkey-sized Caudipteryx to the 8-meter-long, 1.4-ton Gigantoraptor. The group is close to the ancestry of birds, and some researchers have proposed they may represent primitive flightless birds.
Quick Facts
- Taxon
- Oviraptorosauria
Facts from the source article.
Lore & Background
Oviraptorosaurs have shortened rostrums, massive beaklike mandibles, and long parietal bones. Most were medium-sized, rarely exceeding 2 meters, except Gigantoraptor. Primitive members had teeth in the premaxillae, with Incisivosaurus having enlarged bucktoothed incisors; advanced members were toothless. Their skulls and vertebrae show extensive pneumatization in advanced forms. The arms were about half the length of the legs, and the tail was short with about 24 vertebrae. The ischium lacks an obturator process, a derived feature among theropods, and the pectoral girdle was primitive with a broad scapula.
Reader's Guide
Oviraptorosaurs are significant for their close relationship to birds, with some researchers classifying them as true birds more advanced than Archaeopteryx. Evidence of feathers comes from impressions in Caudipteryx, Protarchaeopteryx, and Similicaudipteryx, as well as pygostyle-like tail structures and quill knobs. Their diet is debated, with evidence for small vertebrates, herbivory (gastroliths), and possible mollusk-eating; a 2022 study suggests strong bite forces and herbivory in most, with caenagnathids possibly more omnivorous. Reproduction shows they laid eggs in pairs, incubated at 35–40°C, and were intermediate between crocodilians and birds in reproductive biology. Their legacy lies in illuminating the transition to birds and the diversity of feathered dinosaurs.
Did You Know?
- The name Oviraptorosauria means 'egg thief lizards,' but recent studies show the animal was on top of its own nest, not raiding another's.
- The earliest known oviraptorosaurs include Ningyuansaurus wangi, Protarchaeopteryx robusta, and Incisivosaurus gauthieri from the lower Yixian Formation of China, about 125 million years ago.
- A tiny neck vertebra from England may represent an earlier occurrence of the group at about 140 million years ago.
- Oviraptorosaur eggs are notably elongated, though not the most elongated among diapsids (some squamates hold that record).
Gallery
Frequently Asked Questions
What is Oviraptorosauria?
Oviraptorosauria is a clade of feathered, two-legged maniraptoran dinosaurs from the Cretaceous Period. They are instantly recognizable by their short, beaked, parrot-like skulls, which in some species are topped with a bony crest.
How big did Oviraptorosauria get?
The group covers a surprisingly wide size spectrum, stretching from turkey-sized members such as Caudipteryx all the way up to Gigantoraptor, which measured roughly 8 meters long and tipped the scales at about 1.4 tons.
Where and when did Oviraptorosauria live?
Their fossils have been recovered from both Asia and North America, showing they were spread across multiple continents throughout the Cretaceous Period.
What did Oviraptorosauria look like?
They were bipedal, feather-covered dinosaurs whose most striking feature was a compact, beak-like skull giving them a distinctly parrot-like profile, with some species adding a bony crest above the eyes.
Are Oviraptorosauria closely related to modern birds?
Yes, they occupy a position very near the lineage that gave rise to today's birds, and some researchers have even argued they may represent early, flightless bird ancestors rather than 'true' dinosaurs in the traditional sense.
More in Cretaceous dinosaurs 1-24
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