Growth and Development & Insects as Pests (Sept. 22)

Growth and Development & Insects as Pests (Sept. 22) -...

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Growth and Development & Insects as Pests Types of Reproduction: o Oviparous: egg bearing; most common type in insects, embryonic development occurs outside mother. R-strategist: many offspring; little parental care Egg-tending: often by males; belostomatidae o Viviparous: embryonic development inside mother but no egg; live birth of larvae o Ovoviviparous: embryonic development inside mother in an egg; live birth of larvae Exoskeleton (top to bottom layers) o Epicuticle Waxy, waterproof o Exocuticle Hard o Endocuticle Flexible o Epidermis Living cells Molting o Triggered by hormones o Old endocuticle is separated and a new; layer called the cuticulin (future exoskeleton) is created. o Epidermal cells produce chemicals, which digests old endocuticle. o Intake of air causes insect body to swell and old exoskeleton splits open and is shed (process called ecdysis; shed skin is called exuvium).
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