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Dromaeosaurus
''Dromaeosaurus'' (,"running lizard") was a genus of theropod dinosaur which lived during the Late Cretaceous period (middle late Campanian), sometime between 76.5 and 74.8 million years ago, in the western United States and Alberta, Canada. The type species is ''Dromaeosaurus albertensis'', which was described by William Diller Matthew and Barnum Brown in 1922.
==Description==
''Dromaeosaurus'' was a small carnivore, about in length and 15 kg (33 lb) in weight. Its mouth was full of sharp teeth, and it had a sharply curved "sickle claw" on each foot. It lived during the Campanian stage of the Late Cretaceous, however, some fragmentary remains such as teeth which may belong to this genus have been found from the late Maastrichtian age Lance and Hell Creek Formations, dating to 66 million years ago.〔
''Dromaeosaurus'' had a relatively robust skull with a deep snout. Its teeth were rather large and it had only nine of them in each maxilla.〔 ''Dromaeosaurus'' also had a vein at the back of the head, the ''vena capitis dorsalis'', that drained the front neck muscles through two long canals running to the posterior surface of the brain.〔
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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