原变态

蜉蝣目昆虫所特有的变态类型. 蜉蝣 幼期生活于水中，变为 成虫前要经过一个“ 亚成虫期”。亚成虫同成虫的形态一样，有翅，能飞行，但经历的时间很短，一般为数分钟到一天，再 脱一次皮而为成虫.由于亚成虫体内性腺已趋成熟，可以认为已是成虫，并有继续蜕皮的情形.参 考 资 料1 原变态-原变态(prometamorphosis)   原变态-简介   是 有翅亚纲中最原始的变态类型，仅见于蜉蝣目昆虫。其变态特点是从 幼虫期( 稚虫)转变为真正的成虫期要经过-个亚成虫期。亚成虫(subimago)在外形上与成虫相似，性已发育成熟，翅已展开，并也能飞翔但体色较浅，足较短，多呈静止状态。亚成虫历期较短，一般经1至数小时，即再行-次脱皮变为成虫。 亚成虫期是性已成熟的时期，其 卵子和 精子可以在 生理盐水中结合受精，并能发育成新个体。所以，亚成虫脱皮属成虫脱皮现象，是从低等 表变态类演化到有翅昆虫时保留下来的原始特性。同时，蜉蝣目昆虫的幼期水生，腹部具有由 附肢演化而成的 气管鳃，属多足型，在整个幼期发育中是没有寡足阶段的，颇似 无翅亚纲昆虫，而同所有其它有翅亚纲昆虫是不同的。  原变态  稚虫  亚成虫  蜉蝣目  蝣 相 关 词 条:原变态 |稚虫 |亚成虫 |蜉蝣目 |蝣 |蜉蝣 | 蜉蝣总目 |Ephemeroptera metamorphosis specific type of insect. May fly larvae live in water, becoming an adult prior to undergo a "sub-adult stage." Sub-adult with the adult form, have a wing, can fly, but the experience of time is very short, usually a few minutes to a day off once again and for the adult skin. As the sub-adult gonads has matured in vivo can be considered is the adult, and is going to molt situation. Reference 1 of the original metamorphosis - of the original metamorphosis (prometamorphosis) of the original metamorphosis - Introduction is Pterygota metamorphosis in the most primitive type found only in Ephemeroptera insects. Is characterized by its metamorphosis from the larval stage (nymphs) into a true adult stage to go through - sub-adult stage. Sub-adult (subimago) and adults similar in appearance, sex has been mature, wing has started, and also be able to fly, but lighter in color, foot shorter, Duocheng quiescent state. Sub-adult duration is shorter, generally one to a few hours after that again - time peeling becoming an adult. Sub-adult period is a period of ripe, their eggs and sperm can be fertilized with normal saline, and can develop into new individuals. Therefore, sub-adult peeling peeling an adult phenomenon, is a metamorphosis from a low table class evolved into a winged insect, when the original features retained. At the same time, Ephemeroptera aquatic insect larvae, abdominal appendages have evolved from the gills of the trachea, is a multi-legged type, in the whole period of development in the young widow is not enough stage, resembling no Pterygota insects, while the same All other winged insects subclass is different. Of the original sub-adult metamorphosis nymphs Ephemeroptera Ephemera strigata related entries: The original metamorphosis | nymphs | Asian adult | Ephemeroptera | Ephemera strigata | Ephemera | Ephemeroptera Head |