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An egg is an insect's first part of metamorphosis and incomplete metamorphosis. When an insect is an egg, it may have no defense, leaving it open to predators. Following an egg is a larva in complete metamorphosis, and a nymph in incomplete metamorphosis. Eggs are generally about 1 mm in length and are laid on the underside or upper-side of leaves or maybe buried beneath the earth among the roots of rotting wood or clung onto blades of grass.

Development[]

Insect eggs develop within the ovaries, the reproductive structures of the female that are composed of tapering units called ovarioles. The oocytes differentiate from stem cells at the tip of the ovariole, and as they begin their downward movement in the ovariole they are first completely surrounded by a monolayer of follicle cells (Fig. 1). These follicle cells are involved in the transport of substances from the hemolymph into the cytoplasm of the oocyte that are stored for later use during embryogenesis. Nurse cells may also be present to provide the oocyte with other maternal contributions, such as messenger RNA and mitochondria. The nurse cells subsequently degenerate, and the bulk of the yolk proteins deposited in the oocyte cytoplasm must then cross the layer of follicle cells after their synthesis in the fat body.

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