PlatedSharptoothTurningToChomper This article is for a speculative species; a creature that has not been assigned to a taxon by any official media or material. This article may be deleted in the future for the sake of parsimony.
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that Unquillosaurus

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Unquillosaurus (‬Unquillo River lizard‭)‬ is a genus of dromaeosaurine theropod dinosaurs from late Cretaceous South America. Unquillosaurus measured about 6-10 ft long.[1] It lived during the Campanion stage of the late Cretaceous. The only known species is Unquillosaurus ceibalii.


Unquillosaurus was first described in 1979 by Jaime Eduardo Powell. Its name is derived from the river of Unquillo.[2]The specific name refers to the town El Ceibal.

The holotype, PVL 3670-11, was found at Arroyo-Morterito in Argentina in the Los Blanquitos Formation. It's made up of a left pubis, 1.686 ft long. The specimen was re-studied by Fernando Novas and Federico Agnolin in 2004, who concluded that the orientation of the pubis had been misinterpreted: it pointed backwards, as was shown by the fossil still being attached to a displaced part of the pubic peduncle of the ilium.[3]


Unquillosaurus was originally assigned to the Carnosauria family [2]and then later was given it's own family group prizenly named after itself. [4][3]This is the only dinosaur of dromaeosaur group that was classified to have been a carnosaur.[5]

Unquillosaurus in The Land Before Time

Unquillosaurus appears as an enemy in the game The Land Before Time for the GameBoy Color. It appears in forest themed levels, where it can be seen walking across logs in an attempt to hit the player to deal damage. Fortunately, it can be defeated after enough hits from the game's attack move.


  1. HyperWorks Reference Software (1999), "The Dinosaur Encyclopedia: Unquillosaurus", viewed April 12, 2009.
  2. 2.0 2.1 Powell, J.E. (1979). "Sobre una asociación de dinosaurios y otras evidencias de vertebrados del Cretácico Superior de la región de La Candelaria, Prov. de Salta, Argentina" ["On a dinosaur association and other evidinces of Upper Cretaceous vertebrates from the La Candelaria region, Salta Province, Argentina."] Ameghiniana, 16(1-2): 191-204. (In Spanish: English translation by Matthew Carrano, SUNY at Stony Brook, 8/99).
  3. 3.0 3.1 Novas and Agnolin, (2004). "Unquillosaurus ceibalii Powell, a giant maniraptoran (Dinosauria, Theropoda) from the Late Cretaceous of Argentina." Rev. Mus. Argentino Cienc. Nat., n.s. 6(1): 61-66.
  4. Powell, J.E., 1986. Revision de los titanosauridos de America del Sur Argentina. Universidad Nacional de Tucuman, Argentina
  5. R.D. Martínez and F.E. Novas, 2006, "Aniksosaurus darwini gen. et sp. nov., a new coelurosaurian theropod from the early Late Cretaceous of central Patagonia, Argentina", Revista del Museo Argentino de Ciencias Naturales, nuevo serie 8(2): 243-259
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