In the late '70's and throughout the '80's, the Mongolian palaeontologist Rinchen Barsbold systematically published the descriptions of all the Mongolian oviraptorids, naming Conchoraptor and Ingenia, and having another named in honor or him for his work on both oviraptorids as well and several other Mongolian dinosaurs and birds (though the name first appeared in his own work and in all honesty, he is the author of the informal name. Most notably in his non-generic work, he described the Oviraptoridae to remove the one taxon from Ornithomimidae, and then Oviraptorosauria to remove that taxon from Ornithomimosauria [Barsbold 1976a and 1976b, respectively]. Included in the diagnoses were newer specimens aside from the original AMNH specimen Osborn described (Osborn, 1924), and these helped fill in the varied details lacking from the type, as well as offering a look at the remarkable variations possible in dinosaurs, and especially in this one group.
Fig. 1: The major taxa of Oviraptorosauria (Oviraptor and
Chirostenotes) with Conchoraptor to demonstrate the differences
in body size, with a human and Archaeopteryx for comparison.
The upright scale bars to the left represent meters  on
the left, and feet  on the right, and the same scales are
used on the bottom to show length, with feet scaled above
meters. The human stands average for a Caucasian male at
5.8 ft. or 1.8 m, and Archaeopteryx is a little over 2 ft.,
roughly .6 m from head to tail.
The Oviraptoridae, defined as all taxa closer to Oviraptor than Caenagnathus (now a synonym of Chirostenotes, so that animal is the one to refer to), consists of the following taxa, in two sub-taxa, called Oviraptorinae (all taxa closer to Oviraptor than Ingenia) and Ingeniinae (all taxa closer to Ingenia than Oviraptor):
Fig. 2: All the taxa referable to the Oviraptoridae: A) Oviraptor
philoceratops, restored from the type specimen AMNH 6517. B)
Oviraptor restored from specimen GI 100/42. C) Rinchenia
mongoliensis, restored from the type specimen. D) Ingenia
yanshini, restored from the referred specimen GI 100/33. E)
Conchoraptor gracilis, restored from the type specimen GI
100/20 and referred specimen GI 100/21.
Fig. 3: All the taxa referable to the Caenagnathidae: A)
Chirostenotes pergracilis, restored from specimen CMN 8776. B)
Chirostenotes sternbergi restored from specimen RTMP 90.56.6.
C) Chirostenotes sp., restored from specimen BHM 2033.
D) Caenagnathasia martinsoni, restored from the type specimen
CMGP 401/12457 and referred specimen CMGP 402/12457.
There are additional dinosaurs that have been associated with the oviraptorosaurs, including the therizinosauroids (Therizinosaurus, Segnosaurus, Erlikosaurus (or Erlicosaurus), Enigmosaurus, Nanshiungosaurus, Alxasaurus, and several undescribed or unspecified specimens from North America and China), Avimimus (whose identity as a single dinosaur is not entirely secure (Holtz, 1996a,b), Kakuru, an Australian surangular(?) and caudal vertebra, and a sacrum from Brazil. At present, these taxa are not yet ready to appear on the site. Hopefully, they will in the future.
The taxonomy of oviraptors is diverse, and covers a broad history. From the original descriptions by Osborn and then Barsbold, and subsequent study by Sues, Norell, Currie, Makovicky, Godfrey, the late Nessov, oviraptorosaurs have become a highly analyzed group of theropods, and membership has been various, both those animals considered related, and those that were not. The toothless nature of the jaws and unique form the of palate give oviraptorosaurs a remarkable claim to fame.
To see the taxonomy of the oviraptorosaurs, go to this page: Oviraptorosaur Taxonomy.
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