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''Cedarosaurus'' (meaning "Cedar lizard" - named after the Cedar Mountain Formation, in which it was discovered) was a nasal-crested macronarian dinosaur genus from the Early Cretaceous Period (Barremian). It was a sauropod which lived in what is now Utah. It was first described by Tidwell, Carpenter and Brooks in 1999.〔 It shows similarities to the brachiosaurid ''Eucamerotus'' from the Wessex Formation of southern England, as well as to ''Brachiosaurus'' from the Morrison Formation. ==Anatomy== ''Cedarosaurus'' had a more gracile ulna and radius than its relative ''Venenosaurus''.〔 The ratio of the radius' least circumference to its length is .31 in ''Cedarosaurus''. Metatarsal II is more gracile in ''Cedarosaurus''.〔 Its middle tail vertebrae's neural spines angled anteriorly when the vertebrae are aligned.〔 These vertebrae resemble those of ''Gondwanatitan'', ''Venenosaurus'', and ''Aeolosaurus''.〔 The related ''Venenosaurus'' had unusual lateral fossae, which looked like deep depressions in the outside walls of the vertebral centra.〔 Some fossae are divided into two chambers by a ridge inside the depression.〔 In most sauropods the fossae would form pneumatic openings leading to the interior of the centrum, rather than just being a depression.〔 Less well-developed, but similar fossae are known from ''Cedarosaurus'' itself.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cedarosaurus」の詳細全文を読む スポンサード リンク
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