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Cetiosaurus
''Cetiosaurus'' (SEET-ee-oh-sawr-us) meaning 'whale lizard', from the Greek ''keteios''/κήτειος meaning 'sea monster' (later, 'whale') and ''sauros''/σαυρος meaning 'lizard', is a herbivorous sauropod dinosaur from the Late Jurassic Period, living about 167 million years ago in what is now Europe and in North Africa.
''Cetiosaurus'' was in 1842 the first sauropod from which bones were described and is the most complete sauropod found in England. It was so named because its describer, Sir Richard Owen, supposed it was a marine creature, initially an extremely large crocodile, and did not recognise it for a land-dwelling dinosaur. Because of the early description many species would be named in the genus, eventually eighteen of them. Most of these have now been placed in other genera or are understood to be dubious names, based on poor fossil material. The last is true also of the original type species, ''Cetiosaurus medius'', and so ''C. oxoniensis'' was officially made the new type species in 2014. ''C. oxoniensis'' is based on three more or less complete specimens, discovered from 1868 onwards. Together they contain most of the bones, with the exception of the skull.
''Cetiosaurus oxoniensis'' was a "primitive", quadrupedal, long-necked, small-headed herbivore. It had a shorter tail and neck than most sauropods. The forelimbs on the other hand, were relatively long. ''C. oxoniensis'' is estimated to have been about long and to have weighed roughly .
==Discovery and species==
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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