Reproduction Growth and Development Insect Life Cycles Reproduction Growth and Development

Insect Reproduction Most  sexual In many species of wasps, EXCEPTION: Males  scarce/around at certain times of year Females still reproduce! Common in aphids. In many species of wasps, unfertilized eggs = males fertilized eggs = females Certain species  females produce only females. Insects may reproduce by: laying eggs the eggs hatch inside the female Common in aphids

Insect Growth and Development (Complete Metamorphosis) In most insects Four stages: egg, larva or nymph, pupa, and adult several larval or nymphal stages instars Growth  larval or nymphal stages The eggs, pupae, and mature adults don't grow in size

Pupa stage (cocoon or chrysalis):

Complete Metamorphosis

Insect Growth and Development (Incomplete Metamorphosis) Nymph  look like the adult No wings color may be different Nymphs and adults  usually occupy the same habitat EXAMPLES: true bugs and grasshoppers

Incomplete metamorphosis

Ametabolous life cycle: EXAMPLES: Springtails and silverfish They have an egg stage Once hatched = look exactly like the adult. The nymphs  Missing the sexual organs OR Have them but are unable to reproduce until the adult stage