At the beginning of the butterfly, the pupa shell broke at three places at the same time: between the antenna wings, the dorsal midline of the anterior, middle and posterior thoracic segments, and the connection line between the head and chest. Appendices of the head (antenna and beak tube, etc.). ) and the forefoot are extended first, then the middle foot, hind foot and wings are pulled out, and finally the body is separated from the pupa shell. After hanging upside down for a moment, the soft and withered fins spread out quickly after 5-6 minutes.
But at this time, the wing membrane is not dry and solid, and the wing body is still very weak and unable to fly. It will take another hour or two to flap its wings and fly with the wind.
Extended data
There are three types of pupae:
(1) Free pupae (naked pupae), appendages and wings are not attached to the body, and sometimes they can move freely, such as the pupae of bees and beetles;
(2) The pupae, appendages and wings are all wrapped in a film, such as the pupae of butterflies, moths and tail-lifting insects.
(3) surrounding the pupa, and covering the pupa with a layer of pupa shell made of the skin of the last instar larva such as fly pupa.
In completely deformed insects (such as flies and silkworms), the body shape of insects when they transition from larvae to adults is called pupa. In the pupa development stage, the worm can neither eat nor move, but it is changing in the body: some tissues and organs of the original larvae are destroyed, and new adult tissues and organs are gradually formed. When some pests are in pupal stage, it is the best time to kill them.
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