Arthropods

• Invertebrates: Organisms that do not have a backbone.

  All arthropods have three standard features:

  1. Exoskeleton
  2. Jointed legs
  3. Segmented body
• • Crustaceans (e.g. crabs)
  • Have an exoskeleton, one pair of compound eyes
  • Two body segments – cephalothorax, abdomen
  • More than four pairs of legs (10-14 legs)
• • Arachnids: (e.g. spiders)
  • Two body segments – cephalothorax and abdomen
  • Four pairs of legs (8 legs)
• • Myriapods: (e.g. centipedes)
  • Segmented body
  • One pair of antennae
  • 10+ pairs of legs – 1 or 2 pairs on each segment
• • Insects: (e.g. bees)
  • Three body segments – head, thorax and abdomen
  • Three pairs of jointed legs (6 legs)
  • One pair of antennae
  • 1 or 2 pairs of wings