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Introduction to Insects

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... grow and become an adult, young insects shed or molt their ... In grasshoppers, the young resemble the adults. The younger stages are called nymphs. ... – PowerPoint PPT presentation

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Title: Introduction to Insects


1
Introduction to Insects
  • August 21st, 2008

2
The Study of Insects
  • Known as entomology
  • Entomologists have described and classified more
    than 700,000 insect species.

3
Insect Classification
  • Kingdom Animalia
  • Phylum Arthropoda
  • Class Insecta
  • Orders (know these) Coleoptera, Diptera,
    Hemiptera, Homoptera, Hymenoptera, Lepidoptera,
    Orthoptera, Odonata

4
Insect Anatomy
  • A hard exoskeleton protects a soft interior.
  • Divided into head, thorax, abdomen
  • Most have wings of some type
  • No Lungs breathes through spiracles and trachea
  • insect anatomy web page

5
Mouth Parts
  • Chewing (beetles)
  • Sucking (adult butterflies)
  • Piercing (true bugs)
  • Lapping (fly)

6
Insect Growth
  • The exoskeleton limits the potential size of
    insects, but provides valuable protection.
  • To grow and become an adult, young insects shed
    or molt their exoskeleton.

7
Molting
  • A new, flexible exoskeleton forms beneath the old
    exoskeleton.
  • By taking in extra air, the insect expands itself
    and splits the old skin.
  • The new, soft exoskeleton starts to harden in
    minutes.
  • Once an insect becomes an adult it stops growing.

8
Life Cycles Metamorphosis
  • Complete Metamorphosis
  • For butterflies, the caterpillar is very
    different from the adult.
  • Incomplete Metamorphosis
  • In grasshoppers, the young resemble the adults.
    The younger stages are called nymphs.
  • No Metamorphosis
  • The young are identical to adults, except for
    gonads.

9
Complete Metamorphosis
egg
adult
larva
pupa
10
Incomplete Metamorphosis
egg
adult
nymph
bigger nymph
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