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The lower arthropods all continue ecdysis even when sexually adult. Only the Pterygota cease moulting when adult, and this is correlated with the difficulty of continuing to ecdyse once the adult had evolved wings. The only Pterygotes which ecdyse in the adult stage are mayflies (Ephemeroptera). Associated with the abolition of ecdysis in other adult Pterygote insects is the loss of ecdysial lines of weakness: thus even though they can be forced by injection of ecdysone to undergo a supernumerary apolysis followed by the deposition of a second adult cuticle, they are unable to undergo a supernumerary ecdysis.
KeywordsBaltic Amber Parasitic Copepod Pore Canal Cuticle Structure Adult Cuticle
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