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ADASAURUS

a carnivorous velociraptorine theropod dinosaur from the Late Cretaceous of Mongolia.
Pronunciation: AH-dah-SOR-us
Meaning: Ada lizard
Author/s: Barsbold (1977)
Synonyms: None known
First Discovery: Bügiin Tsav, Mongolia
Chart Position: 241

Adasaurus mongoliensis

Adasaurus is a dromaeosaurid—the predatory dinosaurs affectionately known as "raptors"—whose brief mention in 1977 after its discovery by a joint Soviet-Mongolian expedition in Ulaanbaatar was followed by an equally brief description by Rinchen Barsbold six years later. From a few paragraphs, we were led to believe that Adasaurus had a high and relatively large skull, and "killing claws" on the second digit of each foot that were not only unusually small compared to those of other so called "raptors" but also no bigger than the rest of its own toes.

For many years Adasaurus was pegged as a member of Dromaeosaurinae which includes the heaviest of the dromaeosaurids, but this didn't sit quite right with some experts. At 35kg in weight and under two meters long, it was dwarfed by its purported closest relatives Achillobator and Utahraptor. So, in 2012, Turner et al performed an overhaul of dinosaurs from the bird side of the theropod family tree and recovered Adasaurus as a member of Velociraptorinae—a group of more modestly sized dromaeosaurids that includes Velociraptor and all coelurosaurs closer to it than they are to Dromaeosaurus.
(Evil Spirit Lizard from Mongolia)Etymology
Adasaurus is derived from "Ada" (an evil spirit in Mongolian mythology) and the Greek "sauros" (Lizard). The species epithet, mongoliensis, means "from Mongolia" in Latin.
Discovery
The remains of Adasaurus were discovered at Bügin-Tsav ("The Flaming Cliffs") in the Nemegt Formation, Bayankhongor Province, southwestern Mongolia.
These include IGM 100/20 (the holotype) which is a partial skull and bits of skeleton including two hip bones, and IGM 100/21 which is a partial leg and complete foot. IGM 100/22 and IGM 100/23 were referred to Adasaurus by Currie and Varricchio in 2004, but they remain undescribed and may represent an all new taxon.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Maastrichtian
Age range: 71-68 mya
Stats:
Est. max. length: 1.8 meters
Est. max. hip height: ?
Est. max. weight: 35 Kg
Diet: Carnivore
References
• R. Barsbold (1983) "Carnivorous dinosaurs from the Cretaceous of Mongolia, The joint Soviet-Mongolian Paleontological Expedition".
• Thomas R. Holtz, Jr. (2008) "Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages". /uk.
• Mark A. Norell and Peter J. Makovicky (2004) "Dromaeosauridae" in Weishampel, Dodson and Osmólska (eds) "The Dinosauria: Second Edition".
• K. Kubota & Rinchen Barsbold (2006) "Re-examination of Adasaurus mongoliensis from the Upper Cretaceous Nemegt Formation of Mongolia".
• Philip J. Currie, Eva B. Koppelhus and Martin A. Shugar (2004) "Feathered Dragons: Studies on the Transition from Dinosaurs to Birds". /uk.
• Alan H. Turner, Peter J. Makovicky and Mark Norell (2012) "A review of dromaeosaurid systematics and paravian phylogeny".
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To cite this page:
Atkinson, L. "ADASAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 26th Jul 2017.
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