Eucnemesaurus

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Eucnemesaurus
Temporal range: Late Triassic, 228 Ma
Eucnemesaurus tibia.jpg
Tibia
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Family: Riojasauridae
Genus: Eucnemesaurus
Hoepen, 1920
Species
  • E. fortis Hoepen, 1920
  • E. entaxonis McPhee et al., 2015
Synonyms

Eucnemesaurus (/juːkˌnmɪˈsɔːrəs/; meaning "good tibia lizard", for its robust tibiae) is a basal sauropodomorph dinosaur genus usually considered to be a synonym of Euskelosaurus. Recent study by Yates (2006), however, indicates that it is valid and the same animal as putative "giant herrerasaurid" Aliwalia.

Eucnemesaurus was named in 1920 by Egbert Cornelis Nicolaas van Hoepen. The type species is Eucnemesaurus fortis. The specific name means "strong" in Latin. It is based on holotype TrM 119, a partial skeleton including vertebrae, part of a pubis, a femur, and two tibiae. The remains were found by Van Hoepen in the late Carnian-early Norian-age Upper Triassic Lower Elliot Formation of the Slabberts district, Orange Free State, South Africa.

Yates assigned the genus to the new family Riojasauridae, with Riojasaurus, usually regarded as a melanorosaurid.

Aliwalia[edit]

Fossil material now assigned to Eucnemesaurus was once placed in a separate genus and species, Aliwalia rex (the generic name was taken from the Aliwal Park Reserve in the Union of South Africa, where the first remains were found). The fossil evidence of this species was comparably small, with for many years only femoral fragments and a maxilla known.

The size of the femur led many palaeontologists to believe (along with the clearly carnivorous maxilla), that Aliwalia was a carnivorous dinosaur of remarkable size for the age in which lived. It would have been comparable to that of the large Jurassic and Cretaceous theropods, such as Allosaurus, that evolved tens of millions of years after Aliwalia. The original material was believed to bear a strong similarity to the South American Herrerasaurus, so much so that Aliwalia was originally classified in Herrerasauridae by Peter Galton.

However, later re-evaluation of the material has shown that the maxilla assigned to Aliwalia does not, unlike the other material, belong to Eucnemesaurus, as it is clearly from a carnivore. In addition, new material clearly demonstrates this latter genus' sauropodomorph affinities.

Sources[edit]

  • E. C. N. van Hoepen (1920). "Contributions to the knowledge of the reptiles of the Karroo Formation. 6. Further dinosaurian material in the Transvaal Museum", Annals of the Transvaal Museum 7(2): 93-141
  • Yates, A.M. (2006). "Solving a dinosaurian puzzle: the identity of Aliwalia rex Galton". Historical Biology, 1–31