Asiamericana

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Asiamericana
Temporal range:
Ma
↓
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Coelurosauria
Genus: †Asiamericana
Nesov, 1995
Species:
†A. asiatica
Binomial name
†Asiamericana asiatica
Nesov, 1995
Synonyms

Asiamericana is a

Uzbekhistan. It was named to recognize the occurrence of similar fossil teeth in Central Asia and North America. These regions once formed a connected land mass, during the Cretaceous
period.

Discovery and naming

The holotype teeth were discovered during the Uzbek-Russian-British-American-Canadian (URBAC) expedition by Lev Alexandrovich Nessov between 1974 and 1985 and were first described by Nesov (1985).[1] The type species is A. asiatica, which was named and described by Nesov (1995).[2]

The holotype of A. asiatica is CCMGE 460/12457,[2] and two other teeth (ZIN PH 1110/ 16 and ZIN PH 1129/16) are also known.[3] All three teeth are known from the CBI-14 site of the Bissekty Formation of Kazakhstan.[1][3]

Description

The teeth themselves are straight, lack a constriction at the base, and lack serrations.[2]

Classification

In his initial description of the unusual teeth, Nesov speculated that they may belong to either

saurodont fish or to spinosaurid dinosaurs.[2] He later changed his opinion, deciding that they definitely represented theropod remains,[4] and this opinion was followed by most later researchers who excluded them from reviews of spinosaurid teeth for this reason.[5]

However, in 2013 a study assumed that the teeth were identical to those of the possibly

dromaeosaurid Richardoestesia isosceles, and renamed the species into Richardoestesia asiatica.[6] A subsequent study confirmed this in 2019.[3]

References
  1. ^ a b L. A. Nessov. (1985). Rare bony fishes, terrestrial lizards, and mammals in the estuarine and coastal lowland zone of the Kyzyl-Kum Cretaceous. Yearbook of the All-Union Paleontological Association 28:199-219 [in Russian]
  2. ^ a b c d Nessov, L. A. (1995). Dinozavri severnoi Yevrasii: Novye dannye o sostave kompleksov, ekologii i paleobiogeografii [Dinosaurs of Northern Eurasia: new data about assemblages, ecology and paleobiogeography], Scientific Research Institute of the Earth's Crust, St. Petersburg State University, St. Petersburg, Russia: 156 pp. + 14 pl. [in Russian with short English, German, and French abstracts].
  3. ^ a b c Alexander Averianov & Hans-Dieter Sues. (2019). "Morphometric analysis of the teeth and taxonomy of the enigmatic theropod Richardoestesia from the Upper Cretaceous of Uzbekistan". Journal of Vertebrate Paleontology: e1614941
  4. ^ Nessov, L.A. (1997). Cretaceous nonmarine vertebrates of northern Eurasia. Saint Petersburg: University of Saint Petersburg Institute of Earth Crust, 218 pp. [in Russian].
  5. ^ Buffetaut, Suteethorn, Tong and Amiot (2008). "An Early Cretaceous spinosaurid theropod from southern China." Geological Magazine, 145(5): 745–748.
  6. ^ Sues H.D. and Averianov, A. (2013). "Enigmatic teeth of small theropod dinosaurs from the Upper Cretaceous (Cenomanian–Turonian) of Uzbekistan". Canadian Journal of Earth Sciences. 50: 306-314
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