First Ornithomimid (Theropoda, Ornithomimosauria) from the Upper Cretaceous Djadokhta Formation of Tögrögiin Shiree, Mongolia

The Upper Cretaceous Djadokhta Formation has been intensively surveyed for its fossil vertebrate fauna for nearly a century. Amongst other theropods, dromaeosaurids and parvicursorines are common in the formation, but ornithomimosaurs are extremely rare. A new ornithomimosaur material was discovered...

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Bibliographic Details
Published in:Scientific reports 2017-07, Vol.7 (1), p.5835-5835, Article 5835
Main Authors: Chinzorig, Tsogtbaatar, Kobayashi, Yoshitsugu, Tsogtbaatar, Khishigjav, Currie, Philip J., Watabe, Mahito, Barsbold, Rinchen
Format: Article
Language:English
Subjects:
631/181/414
631/181/757
Animals
Arid environments
Bone and Bones - anatomy & histology
Cretaceous
Dinosaurs
Dinosaurs - anatomy & histology
Eolian deposits
Feet
Fossils
Geography
Humanities and Social Sciences
Mongolia
multidisciplinary
Paleontology
Phylogeny
Science
Science (multidisciplinary)
Small mammals
Time Factors
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Summary:The Upper Cretaceous Djadokhta Formation has been intensively surveyed for its fossil vertebrate fauna for nearly a century. Amongst other theropods, dromaeosaurids and parvicursorines are common in the formation, but ornithomimosaurs are extremely rare. A new ornithomimosaur material was discovered from the Djadokhta Formation, represented by eolian deposits, of the Tögrögiin Shiree locality, Mongolia. This is only the third ornithomimosaur specimen reported from this formation, and includes the astragalus, the calcaneum, the third distal tarsal, and a complete pes. The new material is clearly belonged to Ornithomimidae by its arctometatarsalian foot condition and has the following unique characters; unevenly developed pair of concavities of the third distal tarsal, curved contacts between the proximal ends of second and fourth metatarsals, the elongate fourth digit, and a laterally inclined medial condyle on phalanx IV-1. These diagnostic characters of the Djadokhtan ornithomimosaur indicate that this is a new taxon. Our phylogenetic analysis supports three clades within derived ornithomimosaurs, and the new taxon is placed a member of the derived ornithomimosaurs. The present specimen is the first ornithomimid record from eolian Tögrögiin Shiree locality, and is indicative of their capability to adapt to arid environments.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-05272-6