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| image = Canadaspis perfecta.jpg | image2 = CanadaspisPerfecta_NaturhistorischesMuseum_Nov14-10.jpg | image2_caption = Specimens of ''Canadaspis perfecta'' from the Burgess Shale | authority = Briggs, 1978 | subdivision_ranks = Species | subdivision = }} ''Canadaspis'' ("Shield of Canada") was a Cambrian genus of crustacean or euarthropod, a benthic feeder that moved mainly by walking and possibly used its biramous appendages to stir mud in search of food. The genus has been placed within the subclass Phyllocarida, in the class Malacostraca that includes shrimps and lobsters. ==The organism== ''Canadaspis'' had claws on the end of its frontal appendages which may have been used to stir up sediment, or to scrape off the top layer,〔 which may have been a nutritious layer of microbes. Large particles it stirred up would have been captured by spines on the inside of its legs; these spines would have directed the food particles to the organism's mouth, where it used its mandibles to grind larger particles.〔 Its antennae served a sensory function. Spines on its head probably served to protect its vulnerable eyes from predators.〔 Its limbs probably moved in sequence to produce a rippling motion. Although ''Canadaspis'' probably did not swim, this could have helped propel the organism from under soft sediments. The appendages also produced currents which would have helped with feeding and respiration.〔 ''Canadaspis'' is very closely related to the similar organism ''Perspicaris'', differing only in morphological detail.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canadaspis」の詳細全文を読む スポンサード リンク
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