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Arthropods have all of these characteristics:

  • The body is divided into segments.
  • Paired and jointed appendages (legs, antennae, claws, and external mouth parts)
  • Exoskeleton (hard outer covering made of chitin and no internal bones). Periodically, the rigid exoskeleton is shed in a process called moulting.
  • Bilateral symmetry (each side is a mirror image of the other side).
  • Specialised mouth parts
  • Compound eyes (like a fly)
  • The circulatory system an open one, the only blood vessel usually being a tubular structure dorsal to the alimentary canal with lateral openings in the abdominal region.
  • The nerves run along the lower part of the body below the digestive system - all except the brain.
  • Respiration by means of gills, or tracheae and spiracles.
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