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Insects. Diversity, Regulation & Locomotion. Insect Diversity. There are 26 orders and superorders in the class Hexapoda Insects range from microscopic arthropods to large insects that are over 12” long! They occupy almost every terrestrial environment on earth. Insect Flight.

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Insects l.jpg

Insects

Diversity, Regulation & Locomotion


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Insect Diversity

  • There are 26 orders and superorders in the class Hexapoda

  • Insects range from microscopic arthropods to large insects that are over 12” long!

  • They occupy almost every terrestrial environment on earth


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Insect Flight

  • Insects were first to fly

  • Two types:

    • Direct (synchronous) flight

      • Muscles contract on down and up beats

    • Indirect (asynchronous) flight

      • Muscles change the shape of the exoskeleton

      • The exoskeleton “clicks” and moves the wings


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Other Forms of Insect Locomotion

  • Walking (3+ legs on ground)

  • Running (3 or fewer legs on ground)

  • Jumping

    • saltatory legs

    • changing shape of the exoskeleton until it catapults the insect


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Insect Nervous Regulation

  • Johnston’s organs – hearing

  • Tympanic organs – hearing

  • Compound eyes – sight

  • Some insects can have chemosensors on feet or antennae

  • Some insects use their second ganglia for specialized responses (mating, escaping)


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Insect Chemical Regulation

  • Endocrine system controls

    • Ecdysis

    • Osmoregulation

    • Metabolism

    • Heart rate

  • Pheromones control many specialized behaviors


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