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Dimorphodon
Dimorphodon was a genus of medium-sized pterosaur from the early Jurassic Period. It was named by paleontologist Richard Owen in 1859. ''Dimorphodon'' means "two-form tooth", derived from Greek ''δι''/''di'' meaning 'two', ''μορφη''/''morphe'' meaning 'shape' and ''οδων''/''odon'' meaning 'tooth', referring to the fact that it had two distinct types of teeth in its jaws - which is comparatively rare among reptiles.
==Description==
The body structure of ''Dimorphodon'' displays many "primitive" characteristics, such as, according to Owen, a very small brain-pan and proportionally short wings.〔 The first phalanx in its flight finger is only slightly longer than its lower arm.〔 The neck was short but strong and flexible and may have had a membraneous pouch on the underside. The vertebrae had pneumatic foramina, openings through which the air sacks could reach the hollow interior. ''Dimorphodon'' had an adult body length of 1 metre (3.3 ft) long, with a 1.45 metre (4.6 ft) wingspan.〔 The tail of ''Dimorphodon'' was long and consisted of thirty vertebrae. The first five or six were short and flexible, but the remainder gradually increased in length and were stiffened by elongated vertebral processes.〔 The terminal end of the tail may have borne a ''Rhamphorhynchus''-like tail vane, although no impressions have yet been found in ''Dimorphodon'' fossils to confirm this speculation.〔
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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