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Temporal range: Late Jurassic, 155–146.8 Ma
Allosaurus in Baltow 20060916 1500 white background.jpg
An Allosaurus model
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Clade: Allosauria
Family: Allosauridae
Marsh, 1878
Type species
Allosaurus fragilis
Marsh, 1877



Antrodemidae Marsh, 1878
Labrosauridae Marsh, 1882

Allosauridae was a family of medium to large sized carnivorous theropod dinosaurs. Members included Saurophaganax, Allosaurus, Antrodemus and the poorly known Epanterias, which could well be a specimen of Allosaurus. Allosauridae was named by American paleontologist Othniel Charles Marsh in 1878.[2]

A size comparison of allosaur species.

The exact number of genera that can be included here is very debatable and most of the upper Jurassic and Lower Cretaceous carnosaurs are somewhat closely related to Allosaurus. Whatever the case, allosaurids seemed to be the most successful hunters of their times, outnumbering the Megalosauridae and Ceratosauridae, with which they competed for prey. The allosaurids would eventually be succeeded by their close relatives the carcharodontosaurs in the southern hemisphere, and replaced by the coelurosaurian tyrannosaurids in the northern hemisphere, during the Cretaceous Period.


  1. ^ Carrano, M. T.; Benson, R. B. J.; Sampson, S. D. (2012). "The phylogeny of Tetanurae (Dinosauria: Theropoda)". Journal of Systematic Palaeontology. 10 (2): 211–300. doi:10.1080/14772019.2011.630927. 
  2. ^ Marsh, Othniel Charles (1878). "Notice of new dinosaurian reptiles". American Journal of Science and Arts. 15: 241–244.