这是一个很大的问题,答案足够写一本书,并且还有许多问题没弄清楚.
蚕是完全变态发育
有翅亚纲的内生翅类昆虫,如各种甲虫、蝶、蛾、蜂类和蝇类等,它们虫体自卵孵化后,幼虫和成虫不仅形态不同,生活方式和生活环境也不一致,从幼虫到成虫要经过一个蛹期.在蛹期体内进行剧烈的组织和器官的改造过程,蛹期过后,成虫破蛹而出.这称变态称完全变态,绝大多数昆虫是这种变态类型.
complete metamorphosis (holometabolous insects),the wings,if present,develop internally.larvae.other names,such as maggots (flies),caterpillars (butterflies and moths),or grubs (beetles).resting stage known as a pupa.lacewings (Order Neuroptera),beetles (Order Coleoptera),caddisflies (Order Trichoptera),butterflies and moths (Order Lepidoptera),flies (Order Diptera),fleas (Order Siphonaptera),and sawflies,ants,wasps and bees (Order Hymenoptera).Larvae and adults live in different habitats and feed on different types of food.
