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Eggs of black-veined white (Aporia crataegi) on apple leaf A butterfly from the genus Euploea, laying eggs underneath the leaf. Butterfly eggs are protected by a hard-ridged outer layer of shell, called the chorion. This is lined with a thin coating of wax which prevents the egg from drying out before the larva has had time to fully develop.
The female butterfly lays about 20–30 eggs in spring, a day after mating, on the young buds of its host plant, Sinai thyme (Thymus decussatus).After an incubation period of a few days, the eggs hatch into small larvae which feed on the buds and flowers of Sinai thyme.
The top of the egg is depressed and forms a small central cavity called micropyle through which the egg is fertilised. [11] The micropyle is situated on top in eggs which are globular, conical, or cylindrical; in those eggs which are flattened or lenticular, the micropyle is located on the outer margin or rim.
These are thought to protect the plant as the butterfly avoids laying eggs near eggs already on a host plant, to give her own eggs the best chance of survival. A later example is the mimicking of a mammalian hormone by an ant toxin which causes long-lasting hypersensitivity, Gilbertian mimicry at a molecular level.
Once the larval stage is complete, the caterpillar enters the pupal stage, forming a chrysalis–a hard shell used for protection while it develops into a butterfly. The pupal stage can last from a couple of weeks to several months, depending on environmental conditions. The caterpillar undergoes metamorphosis and emerges a butterfly. In the ...
Male genitalia of Lepidoptera. The main component of the male reproductive system is the testicle, suspended in the body cavity by tracheae and the fat body.The more primitive apterygote insects have a single testis, and in some lepidopterans the two maturing testes are secondarily fused into one structure during the later stages of larval development, although the ducts leading from them ...
After the eggs hatch, the new larvae eat the egg casings for food. Eventually, the larvae will transition either to consuming other eggs or parts of the host plant for nourishment. Throughout the first three instar stages, the larvae primarily consume the leaves and feed away from the leaf margins of the host plant. How much of the leaf and how ...
H. semele eggs are white at first, but turn pale yellow as they develop. The egg stage generally lasts between two and three weeks. [1] When the eggs hatch, the caterpillar grows slowly, feeding at night and typically hibernating during cold temperatures in a deep patch of grass. [1] The larvae are small and cream colored, and there are four ...