Bagaraatan

Bagaraatan
Temporal range: Late Cretaceous, 70 Ma
↓
Skeletal diagram of Bagaraatan ostromi showing known elements in white
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Clade:Dinosauria
Order:Saurischia
Suborder:Theropoda
Superfamily:†Tyrannosauroidea
Genus:†Bagaraatan
Osmolska, 1996
Type species
†Bagaraatan ostromi
Osmolska, 1996

Bagaraatan (meaning "small hunter" in Mongolian) is a genus of theropod dinosaur from the Late Cretaceous period. Its fossils were found in the Nemegt Formation of Mongolia. Bagaraatan may have been around 3 to 4 metres (9.8 to 13 ft) in length.

The type species, B. ostromi, was described by Osmolska in 1996. The post-cranial (ZPAL MgD-I/108) skeleton has been described as "bird-like", while the skull exhibits features of several different theropod groups.

Classification

Size of Bagaraatan ostromi compared to human
Caudal vertebra

Holtz classified Bagaraatan as a basal tyrannosauroid, Coria identified it as a troodontid, and Rauhut placed it in Maniraptora.[1] Mark Loewen et al. placed it in basal tyrannosauroidea, agreeing with the placement by Holtz.[2]

Below is the cladogram by Loewen et al. in 2013.[2]

Tyrannosauroidea

Proceratosauridae

 

 

Proceratosaurus bradleyi

 
 

Kileskus aristotocus

 
 

Guanlong wucaii

 
 
 

 

Sinotyrannus kazuoensis

 
 

 

Juratyrant langhami

 
 

Stokesosaurus clevelandi

 
 
 
 
 

 

Dilong paradoxus

 
 

 

Eotyrannus lengi

 
 

 

Bagaraatan ostromi

 
 

 

Raptorex kriegsteini

 
 

 

Dryptosaurus aquilunguis

 
 

 

 

Alectrosaurus olseni

 
 

Xiongguanlong baimoensis

 
 
 

 

Appalachiosaurus montgomeriensis

 
 

 

 

Alioramus altai

 
 

Alioramus remotus

 
 
 

Tyrannosauridae

 
 
 
 
 
 
 
 
 
 

References

  1. ↑ O. W. M. Rauhut (2003). The interrelationships and evolution of basal theropod dinosaurs. Special Papers in Palaeontology 69: 1-213.
  2. 1 2 Loewen, M.A.; Irmis, R.B.; Sertich, J.J.W.; Currie, P. J.; Sampson, S. D. (2013). Evans, David C, ed. "Tyrant Dinosaur Evolution Tracks the Rise and Fall of Late Cretaceous Oceans". PLoS ONE. 8 (11): e79420. doi:10.1371/journal.pone.0079420. PMC 3819173. PMID 24223179.

Sources

  • Osmolska, H. (1996). "An unusual theropod dinosaur from the Late Cretaceous Nemegt Formation of Mongolia". Acta Palaeontologica Polonica 41; 1-38


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