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Carnosauria
Carnosauria is a large group of predatory dinosaurs that lived during the Jurassic and Cretaceous periods. While it originally contained a wide assortment of giant theropods that were not closely related, the group has since been defined to encompass only the allosaurs and their closest kin. Starting from the 1990s, scientists have discovered some very large carnosaurs in the carcharodontosaurid family, such as ''Giganotosaurus'' and ''Tyrannotitan'' which are among the largest known predatory dinosaurs.
Distinctive characteristics of carnosaurs include large eyes, a long narrow skull and modifications of the legs and pelvis such as the thigh (femur) being longer than the shin (tibia).
==Systematics==
Modern cladistic analysis defines Carnosauria as those tetanurans sharing a more recent common ancestor with ''Allosaurus'' than with modern birds.〔(【引用サイトリンク】title=What do terms like monophyletic, paraphyletic and polyphyletic mean? )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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