Itemirus

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Itemirus
Temporal range: Late Cretaceous, 91 Ma
Itemirus medullaris.jpg
Rear of skull
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Dromaeosauridae
Clade: Eudromaeosauria
Subfamily: Dromaeosaurinae
Genus: Itemirus
Kurzanov, 1976
Species: I. medullaris
Binomial name
Itemirus medullaris
Kurzanov, 1976

Itemirus is a genus of theropod dinosaur from the Turonian age of the Late Cretaceous period of Uzbekistan.

Discovery[edit]

Itemirus is known from a single small damaged fossil braincase or neurocranium, in 1958 found near the village of Itemir at the Dzharakuduk escarpment in layers of the Bissekty Formation. This holotype has accession number PIN 327/699. The type species, Itemirus medullaris, was named and described by Sergei Kurzanov in 1976. The generic name refers to Itemir. The specific name refers to the medulla oblongata, the brain part encased by the partial braincase.[1]

Classification[edit]

Kurzanov noted anatomical similarities to the Tyrannosauridae and the Dromaeosauridae; he assigned Itemirus to a separate Itemiridae. In 2004 Thomas Holtz suggested it was a member of the Tyrannosauroidea.[2] Nicholas Longrich and Philip J. Currie in 2009 included Itemirus in a cladistic analysis of internal dromaeosaurid relationships and found it to be a velociraptorine.[3] In 2014, during a study assigning more material to Itemirus, it was found that the genus could be placed in Dromaeosaurinae in a phylogeny.[4]


Eudromaeosauria

Bambiraptor




Saurornitholestes


Velociraptorinae

Deinonychus




Adasaurus




Velociraptor



Balaur





Dromaeosaurinae

Tsaagan




Dromaeosaurus



Atrociraptor



Utahraptor



Achillobator



Itemirus







See also[edit]

References[edit]

  1. ^ Kurzanov, S. M. (1976) Braincase structure in the carnosaur Itemirus n. gen. and some aspects of the cranial anatomy of dinosaurs. Paleontological Journal 10:361-369.
  2. ^ Holtz, T.R., 2004, "Tyrannosauroidea". In: D. B. Weishampel, P. Dodson, and H. Osmolska (eds.), The Dinosauria (second edition). University of California Press, Berkeley pp. 111-136
  3. ^ Longrich, N.R. and Currie, P.J. (2009). "A microraptorine (Dinosauria–Dromaeosauridae) from the Late Cretaceous of North America." Proceedings of the National Academy of Sciences 106(13): 5002–5007. doi: 10.1073/pnas.0811664106
  4. ^ Sues, H.-D.; Averianov, A. (2014). "Dromaeosauridae (Dinosauria: Theropoda) from the Bissekty Formation (Upper Cretaceous: Turonian) of Uzbekistan and the phylogenetic position of Itemirus medullaris Kurzanov, 1976". Cretaceous Research. 51: 225–240. doi:10.1016/j.cretres.2014.06.007.