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Insects. Insects. Insects have thrived for more than 300 million years (long before rise and fall of dinosaurs) Very successful through evolution and adaptation Insects account for ¾ of the earth’s animal species. Characteristics. Adaptations leading to success (all arthropods)

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Presentation Transcript
insects1
Insects
  • Insects have thrived for more than 300 million years (long before rise and fall of dinosaurs)
  • Very successful through evolution and adaptation
  • Insects account for ¾ of the earth’s animal species
characteristics
Characteristics
  • Adaptations leading to success (all arthropods)
    • Segmented body
    • Jointed appendages
    • Exoskeleton
unique to insects
Unique to Insects
  • Divided into three tagmata
    • Head
    • Thorax
    • Abdomen
  • Have mandibles and one pair of antennae on the head
  • Antennae and other appendages are unbranched
  • Three pairs of jointed legs
  • Many one or two pairs of wings
  • Abdomen has 9 to 11 segments
    • Never has wings or legs in adult
  • Most are small
entomology
Entomology
  • The study of insects
  • Entomologists classify insects in more than 30 orders
  • Based on:
    • Structure of mouthparts
    • Number of wings
    • Type of development
success of insects
Success of Insects
  • Insects live almost everywhere on earth (not in deep ocean)
  • Identified more than 700,000 species
  • Estimated 10 million may exist
success of insects1
Success of Insects
  • Success mainly due to flying
    • Escape predation
    • Move to new environments
  • Exoskeletons
  • Small size = less competition
  • Short life spans and high reproduction rate
    • Natural selection occurs quickly
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