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1 December 2005 NEW INFORMATION ON THE SKULL OF THE ENIGMATIC THEROPOD SPINOSAURUS, WITH REMARKS ON ITS SIZE AND AFFINITIES
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Abstract

New specimens of the unusual theropod Spinosaurus cf. S. aegyptiacus from the Late Cretaceous (early Cenomanian) of Morocco reveal new information about the structure of the snout and the very large adult body size attained by the species. The external naris is retracted farther caudally on the snout than in other spinosaurids and is bordered exclusively by the maxilla and nasal. The fused nasals preserve a longitudinal, fluted crest. The size of the snout suggests that Spinosaurus may well have exceeded the maximum adult body size of other large Cretaceous theropods such as Tyrannosaurus and Giganotosaurus. The new material also supports the monophyly of the Spinosaurinae and the separation of Spinosaurus and Irritator.

CRISTIANO DAL SASSO, SIMONE MAGANUCO, ERIC BUFFETAUT, and MARCO A. MENDEZ "NEW INFORMATION ON THE SKULL OF THE ENIGMATIC THEROPOD SPINOSAURUS, WITH REMARKS ON ITS SIZE AND AFFINITIES," Journal of Vertebrate Paleontology 25(4), (1 December 2005). https://doi.org/10.1671/0272-4634(2005)025[0888:NIOTSO]2.0.CO;2
Accepted: 25 May 2005; Published: 1 December 2005
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