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出典:Wiktionary
出典:『Wiktionary』 (2016/04/15 08:59 UTC 版)
rostral bone (複数形 rostral bones)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/15 16:09 UTC 版)
The rostral bone is the edentulous (toothless) dorsal component of the skeleton of the beak, unique to the ceratopsian dinosaurs. Othniel Charles Marsh recognized and named this bone, which acts as a mirror image of the predentary bone on the lower jaw.
rostral bone