单词	exoskeleton
释义	exoskeleton /ˈɛksəʊˌskɛlɪt(ə)n / noun Zoology A rigid external covering for the body in some invertebrate animals, especially arthropods. Compare with endoskeleton.The trilobites comprise a major class-level clade of extinct marine arthropods characterized by calcareous, multisclerite, dorsal exoskeletons.... Lobsters, like all animals with exoskeletons, periodically shed their armor as they grow. In these specimens the external surface of the exoskeleton is present, unless complete or partial exfoliation is noted. Derivatives exoskeletal adjective ... Both have sophisticated recognition abilities based on olfactory cues emanating from the exoskeletal cuticle. In this paper we report the discovery of a nearly complete trilobite fossil over 680 mm long that yields a reconstructed exoskeletal length of more than 720 mm. They considered the specimen to be testate, but where the cranidium is broken on the right posterolateral corner, there is no sign of an exoskeletal layer.
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