| Chuandongocoelurus | |
|---|---|
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| Skeletal diagram showing known remains | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Genus: | †Chuandongocoelurus He, 1984 |
| Species: | †C. primitivus |
| Binomial name | |
| †Chuandongocoelurus primitivus He, 1984 | |
Chuandongocoelurus (/tʃwɑːnˌdɒŋəsɪˈljʊərəs/chwahn-DONG-ə-si-LURE-əs) is agenus of carnivoroustetanurantheropoddinosaur from theJurassic ofChina.
Thetype speciesChuandongocoelurus primitivus was first described and named by Chinese paleontologistHe Xinlu in 1984. The generic name combines references to theChuandong inSichuan Province and the theropod genusCoelurus, itself named after theGreek κοῖλος,koilos, meaning "hollow" and οὐρά,oura, meaning "tail". Thespecific name means "the primitive one" inLatin, a reference to the great age of the find.[1]
He assigned two partial skeletons toChuandongocoelurus. Theholotype, a thighbone, is part of specimen CCG 20010. Vertebrae, pelvic bones and hindlimb elements, also catalogued under this inventory number, may belong to the same individual. The specimen has unfused neurocentral sutures in its vertebrae, meaning that the animal was immature at the time of death. The second specimen, CCG 20011, is a set of neck vertebrae from a much larger individual.[1] In 2012, it was concluded that both specimens represent different taxa, probably not even closely related. CCG 20011 was found to instead share similarities with theceratosaurElaphrosaurus.[2] The formation in which it was discovered was theLower Shaximiao Formation, meaningChuandongocoelurus dates to theBathonian orCallovian stage of theMiddle Jurassic.
The holotype thighbone has a length of 201 millimetres.[1]
He placedChuandongocoelurus in theCoeluridae,[1] at the time awastebasket taxon including almost all small theropods.David Bruce Norman in 1990 considered it to be an indeterminate theropod.[3] More recently,Roger Benson (2008, 2010) and Bensonet al. (2010) found it to be thesister taxon ofMonolophosaurus, together forming aclade belonging either toMegalosauroidea[4][5] or outside of Megalosauroidea in theTetanurae.[6] In 2012,Matthew Carranoet al. foundChuandongocoelurus outside of theMegalosauroidea.[2]
The cladogram below follows Rauhut and Pol (2019):[7]
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