An unusual theropod dinosaur from the Late Cretaceous Nemegt Formation of Mongolia
Year: 1996
Type: article
Abstract: An incomplete skeleton of a theropod dinosaur, Bagaraatan ostromi gen ' et sp ' n., was found in the Nemegt Fm. at Nemegt, Mongolia. The mandible in B. ostromi has a shallow but massive dentary, relatively deep postdentary portion with two surangular foramina and somewhat elongated retroarticular process; on the lateral surface of the postacetabular process of the ilium there are two large depressions for muscle origins separated by a crestlike projection; the fibula is fused distally with the tibiotarsus and the coalesced astragalocalcaneurn- Baga-ractan represents the Tetanurae and displays some synapomorphies with the Avetheropoda, however, incompleteness of the skeleton of B. ostromi does not allow to determine its more precise affiliation. Bagaraatan was about 3'0-3.5 m long, had a relatively small head and slender hind limbs. The presence of strongly developed hyposphenes in a long series of anterior caudals rendered its tail only slighily fl exible proximally.
Author: Halszka Osmólska
Institutions: Institute of Paleobiology, Polish Academy of Sciences
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W788881084