第三节变态 Metamorphosis o Metamorphosis: The relatively abrupt change in body form between the end of immature development and the onset of the imaginal(adult) phase 胚后发育过程中,昆虫从幼期状态转变为成虫状态 现象。 5 patterns of development
Metamorphosis l Metamorphosis: The relatively abrupt change in body form between the end of immature development and the onset of the imaginal (adult) phase. l 胚后发育过程中，昆虫从幼期状态转变为成虫状态的 现象。 – 5 patterns of development
增节变态 Anamorphosis A metamorphosis in which the immature stages have fewer abdominal segments than the adult原尾目腹 部体节数由9变为12节 是系统演化中多足纲遗 留下来的特征
l 一、增节变态 Anamorphosis – A metamorphosis in which the immature stages have fewer abdominal segments than the adult.原尾目腹 部体节数由9变为12节 – 是系统演化中多足纲遗 留下来的特征
二、表变态 Epimorphosis In Collembola, Diplura Archeognatha and Thysanura which as adults remain wingless the degree of change from juvenile to adult is slight and is manifest primarily in increased body size and development of functional genitalia ●弹尾目、双尾目、石炳目、缨尾 幼虫基本具备了成虫的特点 ●除了个体增大、触角及尾须节数 增多、性器官继续成熟以外,性 成熟后仍继续脱皮
l 二、表变态Epimorphosis – In Collembola, Diplura, Archeognatha and Thysanura, which as adults remain wingless, the degree of change from juvenile to adult is slight and is manifest primarily in increased body size and development of functional genitalia. l 弹尾目、双尾目、石炳目、缨尾 目 l 幼虫基本具备了成虫的特点 l 除了个体增大、触角及尾须节数 增多、性器官继续成熟以外，性 成熟后仍继续脱皮
三、原变态 Prometamorphosis Nymphs of may flies have 12-45 aquatic instar and wings are visible in older nymphs. Between the nymph stage and adult stage there is a subimago.蜉蝣幼虫到成虫期之间有一个很 短的“亚成虫期”。 The subimago is fully winged, flying or crawling
l 三、原变态Prometamorphosis – Nymphs of mayflies have 12-45 aquatic instars, and wings are visible in older nymphs. Between the nymph stage and adult stage there is a subimago . 蜉蝣幼虫到成虫期之间有一个很 短的“亚成虫期” 。 – The subimago is fully winged, flying or crawling