Abelisaurus

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Abelisaurus
Temporal range: Late Cretaceous, 80Ma
Abelisaurus skull.jpg
Reconstruction of the Abelisaurus skull with original bones of the holotype. Scale = 10 cm
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Suborder: Theropoda
Family: Abelisauridae
Clade: Brachyrostra
Tribe: Carnotaurini
Bonaparte & Novas, 1985
Genus: Abelisaurus
Bonaparte & Novas, 1985
Species: † A. comahuensis
Binomial name
Abelisaurus comahuensis
Bonaparte & Novas, 1985

Abelisaurus (/əˌbɛlɨˈsɔrəs/; "Abel's lizard") is a genus of abelisaurid theropod dinosaur during the Late Cretaceous Period (Campanian) of what is now South America. It was a bipedal carnivore that probably reached 7 to 9 meters (25 to 30 feet) in length, although it is known from only one partial skull.

The generic name recognizes Roberto Abel as the discoverer of the specimen, and also the former director of the provincial Museum of Cipolletti in Argentina, where the specimen is housed. It also incorporates the Greek σαυρος/sauros, meaning 'lizard'. There is one named species, A. comahuensis, which honors the Comahue region of Argentina, where the fossil was found. Both genus and species were named and described by Argentine paleontologists Jose Bonaparte and Fernando Novas in 1985, who placed it in the newly created family Abelisauridae.[1]

Classification[edit]

Artist's restoration

Many other abelisaurids have since been discovered, including extremely complete specimens of Aucasaurus, Carnotaurus and Majungasaurus. Some scientists place Abelisaurus as a basal abelisaurid, outside the subfamily Carnotaurinae.[2][3] Others are less certain of its position.[4][5] Abelisaurids share some skull features with the unrelated carcharodontosaurids and, since Abelisaurus is known only from a skull, future discoveries may show that this genus was in fact a carcharodontosaurid.[6] However, this is thought unlikely.[5]

Fossil material and age[edit]

The one known fossil skull of Abelisaurus is incomplete, especially on the right side. It is also missing most of the palate (roof of the mouth). Despite the missing pieces, it is over 85 centimeters (33 inches) long. Although there are no bony crests or horns, like those found in some other abelisaurids, such as Carnotaurus, rough ridges on the snout and above the eyes might have supported some kind of crest made out of keratin, which would not have become fossilized. There are also very large fenestrae (window-like openings) in the skull, which are found in many dinosaurs and reduce skull weight.[1]

Abelisaurus is one of the many dinosaurs that have been discovered in Patagonia. It was originally described as coming from the Allen Formation but subsequent research proved the remains were actually found in the older Anacleto Formation (part of the Neuquén Group) of Rio Negro Province, Argentina. The Anacleto is a geologic formation in South America, dating from the early Campanian stage of the Late Cretaceous Period, between 83 and 80 million years ago.[7]

References[edit]

  1. ^ a b Bonaparte, J.F. & Novas, F.E. (1985). "Abelisaurus comahuensis, n.g., n.sp., Carnosauria of the Late Cretaceous of Patagonia". Ameghiniana. 21: 259-265. [In Spanish]
  2. ^ Tykoski, R.S. & Rowe, T. 2004. Ceratosauria. In: Weishampel, D.B., Dodson, P., & Osmolska, H. (Eds.) The Dinosauria (2nd edition). Berkeley: University of California Press. Pp. 47-70.
  3. ^ Sereno, P.C., Wilson, J.A., & Conrad, J.L. 2004. New dinosaurs link southern landmasses in the Mid-Cretaceous. Proceedings of the Royal Society of London: Biological Sciences 271: 1325-1330.
  4. ^ Sampson, S.D., Witmer, L.M., Forster, C.A., Krause, D.A., O'Connor, P.M., Dodson, P., Ravoavy, F. 1998. Predatory dinosaur remains from Madagascar: implications for the Cretaceous biogeography of Gondwana. Science 280: 1048-1051.
  5. ^ a b Lamanna, M.C., Martinez, R.D., & Smith, J.B. 2002. A definitive abelisaurid theropod dinosaur from the early Late Cretaceous of Patagonia. Journal of Vertebrate Paleontology. 22(1): 58-69.
  6. ^ Novas, F.E. 1997. Abelisauridae. In: Currie, P.J. & Padian, K.P. Encyclopedia of Dinosaurs. San Diego: Academic Press. Pp. 1-2.
  7. ^ Leanza, H.A., Apesteguia, S., Novas, F.E., & de la Fuente, M.S. 2004. Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages. Cretaceous Research 25(1): 61-87.

External links[edit]