A cartoon group for finding the whole process of butterfly transformation

Butterfly is a completely metamorphosed insect, which has four distinct developmental stages in its life: (1) egg stage (embryonic stage); (2) Larval stage (growth stage); (3) pupal stage (transition period); (4) Adult stage (sexual stage). The last three stages of development are collectively called postembryonic development. From the morphological point of view, the postures shown in these four developmental stages have nothing in common. Therefore, only through systematic research or continuous observation can we understand that they are originally four developmental stages of a species.

Butterfly is a completely metamorphosed insect, which has four distinct developmental stages in its life: (1) egg stage (embryonic stage); (2) Larval stage (growth stage); (3) pupal stage (transition period); (4) Adult stage (sexual stage). The last three stages of development are collectively called postembryonic development. From the morphological point of view, the postures shown in these four developmental stages have nothing in common. Therefore, only through systematic research or continuous observation can we understand that they are originally four developmental stages of a species.

When the butterfly larvae grow to estrus, they stop feeding and choose a suitable place to prepare for pupation. The pupation methods of butterflies often vary from species to species. When some species of larvae mature, they descend to the grass surface near the host plant, forming a very thin soil chamber where they pupate. Like a double-ring butterfly. Some spin silk, decorate leaves into nests, and hide in the nests to feed and pupate, such as rice butterflies. Others, like moths, spin silk into thin cocoons and pupate, such as yellow butterflies. The most common pupae are exposed. After the mature larvae choose the pupation site (such as the stem and leaf of the host plant or the surface of other objects), they first spin the silk into a mat, hook it with their tails and feet to avoid falling off, then restrain the head from bending back, spin silk repeatedly, stick it around the middle waist to form a thick line, and then pupate it so as not to fall off, so it is called pupation. There is also a kind of pupa called hanging pupa, that is, mature larva. After spinning into a mat, hook it with the tail foot, hang upside down, enter the "pre-pupation" stage, and pupate after maturity.

When pupating, the cuticle of the larva splits at the midline of the chest and back, and the cortex moves backward rapidly due to the continuous expansion and contraction of the pupa. When it retreats to the tail end, it immediately extends outward (at this time, only the cortex near the anus has not been detached), and at the same time, it quickly twists its body to hook the hip spine on the silk pad, so that it can be safely hung. Then the old skin of the larva falls off, and the body wall of the pupa gradually shrinks and hardens, transforming into various inherent forms.

Adult is the last stage of butterfly development, called sexual stage, which has two forms: male and female. Adults must leave the pupa shell and go out after they mature in the pupa shell. The phenomenon that adults shed their pupal shells is called eclosion. This is not to be confused with the hatching of larvae from eggshells.

At the early stage of adult emergence, the pupa shell breaks at the same time among the antenna wings, the dorsal midline of the anterior, middle and posterior thoracic segments, and the connecting line between the head and chest. Appendices of the head (antenna and beak tube, etc.). ) and the front legs are extended first, and the middle feet, hind feet and wings are pulled out immediately. After the feet stick to other things, the body immediately leaves the pupa shell and hangs upside down for a while, and the soft and withered fins will soon take 5-6 minutes.