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Chondrosteosaurus
''Chondrosteosaurus'' (meaning "cartilage and bone lizard") was a sauropod from Early Cretaceous England.
The type species, ''Chondrosteosaurus gigas'', was described and named by Richard Owen in 1876. The fossils of ''Chondrosteosaurus'' were discovered in the Wessex Formation on the Isle of Wight. ''C. gigas'' is known only from two neck vertebrae (specimens BMNH 46869, the holotype, and BMNH 46870), with distinctive hollows and internal passages now interpreted as evidence of pneumatic air sacs. Paleontologist Harry Seeley had interpreted similar structures as pneumatic in his specimen of ''Ornithopsis''.〔Seeley, H.G. (1870). "On ''Ornithopsis'', a gigantic animal of the pterodactyle kind from the Wealden." ''Annals and Magazine of Natural History'', Series 4, 5: 279-283.〕 Owen disagreed with Seeley's concept of a giant creature bridging the gap between birds or pterosaurs (Owen considered sauropods to be whale-like marine reptiles), and while he acknowledged that the external cavities on the vertebrae may have been connected to the lungs, he interpreted the internal passages as having been filled with cartilage (hence his name for the genus, ''Chondrosteosaurus'' or "cartilage and bone lizard").〔Owen, R. (1876). "Monograph on the fossil Reptilia of the Wealden and Purbeck Formations. Supplement 7. Crocodilia (''Poikilopleuron'') and Dinosauria? (''Chondrosteosaurus'')." ''Palaeontographical Society Monographs'', 30: 1-7.〕
Owen also named a second species, ''Chondrosteosaurus magnus'', that today no longer is considered to belong to ''Chondrosteosaurus''.
==References==
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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