Ajancingenia
| Ajancingenia Temporal range: Late Cretaceous,
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| Profile illustrating known portions of the head and neck | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Oviraptoridae |
| Subfamily: | †Ingeniinae |
| Genus: | †Ajancingenia Easter, 2013 |
| Type species | |
| †Ingenia yanshini | |
Ajancingenia is a genus of oviraptorid theropod dinosaurs, with one known species, Ajancingenia yanshini. Fossils have been found in several Late Cretaceous-age formations (approximately 70 million years ago) of Mongolia, most prominently in the Bugin Tsav beds of the Nemegt Formation, which has also yielded the holotype of Mononykus olecranus. Ajancingenia is known from only a few specimens, which include only the arms, legs, pelvis, shoulder girdle, and partial skull, and a few vertebrae. Some material referred to as Ajancingenia comes from older formations, but these specimens have not been well described.
Etymology
Ajancingenia was first named by Rinchen Barsbold in 1981 and the type species is Ingenia yanshini. The name "Ingenia" derives from the Ingen Khoboor Depression of Bayankhongor Province, Mongolia, from whence it was collected, while the specific name yanshini was chosen in honour of academician Aleksandr Leonidovich Yanshin (1911–1999), who was adviser and mentor to the describer Barbsold Rinchen during his time at the Paleontological Institute in St. Petersburg, Russia.[1]
The generic name Ingenia was preoccupied by the generic name of Ingenia mirabilis Gerlach, 1957, a tripyloidid nematode. Thus, an alternative generic name, Ajancingenia, was proposed by Jesse Easter in 2013.[2]
Taxonomy and phylogeny
Ajancingenia belongs to the oviraptorids, as distinguished by a pubis with a forward-curving shaft (among other features), and by the unique shape of the lower jaw with a strongly S-curved jaw margin, short snout, and rounded, fused cranial bones. Some material includes paired sternal plates fused along the midline and bearing a short carina.
It is distinguished from all other oviraptorids by manual digit I subequal in length to digit II, and from all other oviraptorids except Nemegtomaia barsboldi in manual ungual I more than 100% larger than ungual II.[2]
References
- ^ Barsbold, R. (1981). "Bezzubye khishchnye dinozavry Mongolii." [Toothless carnivorous dinosaurs of Mongolia.]. Trudy -- Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya, 15: 28-39, 124. [in Russian, w/ English summary].
- ^ a b Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.11646/zootaxa.3737.2.6 , please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with
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External Links
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