Understanding Insect Life Cycles

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Understanding Insect Life Cycles
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What is a Life Cycle?

• A life cycle is the continuous sequence of
  changes undergone by an organism from beginning
  of life till death.
• Baby
• Toddler
• Child
• Teenager
• Adult

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Metamorphosis

• Metamorphosis refers to the different patterns
  of development or series of stages within a life
  cycle.
• 3 types of insect metamorphosis
• Complete
• Incomplete
• No metamorphosis

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Complete Metamorphosis

• Egg

Larva
Pupa
Adult
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Complete Metamorphosis

• 1.Egg insects lay eggs on leaves, in trees,
  animal carcasses and in water. Some insect eggs
  serve as time capsules to help the population
  survive harsh conditions, not hatching until the
  conditions improve.

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Larva

• 2. Larva the immature, wingless, feeding stage
  of an insect that undergoes complete
  metamorphosis.
• Grubs, maggots and caterpillars are insect
  larvae.

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Pupa

• 3. Pupa an insect in the nonfeeding, usually
  immobile, transformation stage between the larva
  and the adult.

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Adult

• Adult Adults look very different after they
  immerge from the pupa.

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Incomplete Metamorphosis

• Egg

Wingless Nymph
Adult
Wingless Nymph
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• Nymph the young of an insect that undergoes
  incomplete metamorphosis.
• Instars  A stage of an insect or other arthropod
  between molts. Some insects go through as many as
  16 instars before becoming an adult.
• Adult Look similar to the nymph but hasnt gone
  through a pupal stage.

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No Metamorphosis
Nymph
Adult

• Egg

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• Young The young of no metamorphosis insects are
  different in that they look exactly like the
  adult but may not have the reproductive organs.
• Silver fish and Springtails have this
  metamorphosis.

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Aphids

• Aphids have a strange life cycle. Some aphids are
  born live. They do not have an egg stage.

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Metamorphosis based on Orders

• No Metamorphosis- Thysanura
• Incomplete Metamorphosis- Orthoptera
• Hemiptera
• Homoptera
• Dermaptera
• Thysanoptera
• Isoptera
• Phthirptera
• Odonata
• Complete Metamorphosis- Siphonoptera
• Neuroptera
• Hymenoptera
• Diptera
• Lepidoptera
• Coleoptera