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New specimens of the crested theropod dinosaur Elmisaurus rarus from Mongolia

100%

Currie P. J., Funston G. F., Osmolska H.

Acta Palaeontologica Polonica

2016

tom 61

nr 1

New specimens of Elmisaurus rarus from the Upper Cretaceous of Mongolia (Nemegt Formation) preserve bones not previously found in “elmisaurids” that help elucidate their relationships to Leptorhynchos elegans and other oviraptorosaurs. Elmisaurus rarus and the North American Leptorhynchos elegans are known from numerous but incomplete specimens that are closely related to, but nevertheless clearly distinguished from, Chirostenotes pergracilis and Epichirostenotes curriei. These specimens include the first known cranial bone attributed to Elmisaurus, the frontal, which clearly shows this animal had a cranial crest (most of which would have been formed by the nasal bones). The first vertebrae, scapula, femora, and tibiae from Elmisaurus are also described. The Elmisaurinae can be distinguished from the Caenagnathinae by the coossification of the tarsometatarsus and smaller size at maturity. Examination of oviraptorosaur hindlimbs reveals four distinct morphotypes, possibly attributable to paleoecological differences.

New elmisaurine specimens from North America and their relationship to the Mongolian Elmisaurus rarus

80%

Funston G. F., Currie P. J., Burns M. E.

Acta Palaeontologica Polonica

2016

tom 61

nr 1

New specimens from Canada confirm the presence of elmisaurines in North America and shed light on the relationship of Leptorhynchos elegans to Mongolian forms. These specimens have hindlimb elements previously unknown from elmisaurines in the Dinosaur Park Formation, including tibiae and pedal phalanges. Metatarsal anatomy is sufficiently different to merit a generic distinction from Elmisaurus rarus, and both can be distinguished from Caenagnathus collinsi and Chirostenotes pergracilis. Differences between these taxa include body size, degree of coossification of the tarsometatarsus, and development of cruciate ridges of the metatarsal III. Histological analysis confirms that these differences are not correlated with ontogenetic age of the specimens. The results support the informal separation of caenagnathids based on metatarsal structure, and allow comments on paleobiological differences between caenagnathids and oviraptorids.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Currie P. J.

2 Funston G. F.

1 Burns M. E.

1 Osmolska H.

2 2016

Wyniki wyszukiwania

New specimens of the crested theropod dinosaur Elmisaurus rarus from Mongolia

New elmisaurine specimens from North America and their relationship to the Mongolian Elmisaurus rarus