The classification of Ceratosaurus and its immediate relatives has been under intense debate recently.

* The T-Rex has three fingers and more closely resembles a large Ceratosaurus along with the Raptors.

The somewhat more advanced ceratosaurs ( including Ceratosaurus and Carnotaurus ) appeared during the Early Jurassic and continued through to the Late Jurassic in Laurasia.

*† Ceratosaurians, including Ceratosaurus and abelisaurids.

The preserved fauna consists of almost all dinosaurs with the majority being carnivorous dinosaurs including Allosaurus ( material from at least 44 individuals make up almost 67 % of all remains ), Torvosaurus ( 1 ), Ceratosaurus ( 1 ), Stokesosaurus ( 2 ), Marshosaurus ( 2 ), and possibly an Ornitholestes.

Ceratosaurus, at first glance, looked like a fairly typical theropod, however its skull was quite large in proportion to the rest of its body and possessed a prominent nose horn formed from protuberances of the nasal bones.

More recently, a Ceratosaurus made a brief appearance in the film Jurassic Park III in which it is repelled from attacking the main characters by a large mound of Spinosaurus dung.

Some form of armor appears to have been necessary, as Stegosaurus species coexisted with large predatory theropod dinosaurs, such as Allosaurus and Ceratosaurus.

Ceratosaurus lived alongside dinosaurs such as Allosaurus, Torvosaurus, Apatosaurus, Diplodocus, and Stegosaurus.

A recent study by Robert Bakker suggested that Ceratosaurus generally hunted aquatic prey, such as fish and crocodiles, although it had potential for feeding on large dinosaurs.

A Ceratosaurus battles a Triceratops in the 1966 remake of One Million Years B. C .. Ceratosaurus is also featured in The Land That Time Forgot ( 1975 ) where it battles a Triceratops, and its sequel The People That Time Forgot ( 1977 ) in which Patrick Wayne's character rescues a cavegirl from two pursuing Ceratosaurus by driving the dinosaurs off with smoke bombs ( after having failed to frighten them off by firing shots in the air once the Ceratosaurus attention had been shifted to Patrick Wayne's party of explorers ).

Ceratosaurs are members of a group of theropod dinosaurs defined as all theropods sharing a more recent common ancestry with Ceratosaurus than with birds.

While this is happening, Tumak and Loana encounter a battle between a Ceratosaurus and a Triceratops.

::: Ceratosaurus sp.

Ceratosaurus () meaning " horned lizard ", in reference to the horn on its nose ( Greek κερας / κερατος, keras / keratos meaning " horn " and σαυρος / sauros meaning " lizard "), was a large predatory theropod dinosaur from the Late Jurassic Period ( Kimmeridgian to Tithonian ), found in the Morrison Formation of North America, and the Lourinhã Formation of Portugal.

In addition to the large nasal horn, Ceratosaurus possessed smaller hornlike ridges in front of each eye, similar to those of Allosaurus, these ridges were formed by enlargement of the lacrimal bones.

Uniquely among theropods, Ceratosaurus possessed dermal armor, in the form of small osteoderms running down the middle of its back.

David B. Norman ( 1985 ) estimated that the maximum length of Ceratosaurus was.

An assessment supported by a particularly large Ceratosaurus specimen from the Cleveland-Lloyd Quarry ( UMNH 5278 ), discovered in the mid-1960s, which may have been long assuming similar proportions to the holotype.

Marsh ( 1884 ) suggested that Ceratosaurus weighed about half as much as Allosaurus.

Ceratosaurus nasicornis skeleton restoration by O. C.

Ceratosaurus is known from the Cleveland Lloyd Dinosaur Quarry in central Utah and the Dry Mesa Quarry in Colorado.

The type species, described by O. C. Marsh in 1884 and redescribed by Gilmore in 1920, is Ceratosaurus nasicornis.

Ceratosaurus is present in stratigraphic zones 2 and 4-6 of the Morrison Formation.

Relatives of Ceratosaurus include Genyodectes, Elaphrosaurus, and the abelisaurs, such as Carnotaurus.

While considered distant from birds among the theropods, Ceratosaurus and its kin were still very bird-like, and even had a more avian tarsus ( ankle joint ) than Allosaurus.

Ceratosaurus reached lengths of 6 to 8 m ( 20 to 27 feet ), was around 2. 5 m ( 8 feet ) tall, and weighed between 500 kg and 1 tonne.

Marsh named the following dinosaur genera: Allosaurus ( 1877 ), Ammosaurus ( 1890 ), Anchisaurus ( 1885 ), Apatosaurus ( 1877 ), Atlantosaurus ( 1877 ), Barosaurus ( 1890 ), Camptosaurus ( 1885 ), Ceratops ( 1888 ), Ceratosaurus ( 1884 ), Claosaurus ( 1890 ), Coelurus ( 1879 ), Creosaurus ( 1878 ), Diplodocus ( 1878 ), Diracodon ( 1881 ), Dryosaurus ( 1894 ), Dryptosaurus ( 1877 ), Labrosaurus ( 1896 ), Laosaurus ( 1878 ), Nanosaurus ( 1877 ), Nodosaurus ( 1889 ), Ornithomimus ( 1890 ), Pleurocoelus ( 1891 ), Priconodon ( 1888 ), Stegosaurus ( 1877 ), Torosaurus ( 1891 ), Triceratops ( 1889 ).

Ceratosaurus fossils are noticeably less common than those of Allosaurus, but whether this implies Ceratosaurus being rarer is uncertain ( animals with certain lifestyles are more biased toward fossilization than others ).

Tetanurae are defined as all theropods more closely related to modern birds than to Ceratosaurus ( e. g. Padian et al., 1999 ).

* Ceratosaurus nasicornis ( now on display at the Smithsonian ) is excavated in 1883, and later named and described by Marsh ( March 19, 1884 ).

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Although gold has an atomic number of 79, immediately after Rutherford's paper appeared in 1911 Antonius Van den Broek made the intuitive suggestion that atomic number is nuclear charge.

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