SEAN KENT
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Key Characteristics of Arthropods

  1. Exoskeleton
    Composed of protein, lipids, chitin, and usually calcium carbonate 
  2. Jointed appendages
    One pair of jointed appendages for each segment
  3. Bilateral symmetry
    Head, Thorax, and Abdomen; or Cephalothorax and Abdomen
  4. Complex muscular system
  5. Hemocoel for a body cavity
  6. Open circulatory system
  7. Complex digestive system
  8. Respiratory system
    Gills, trachea, or book lungs
  9. Complex nervous system
    Dorsal brain; ventral nerve cord
  10. Molting (i.e. growth with ecdysis)

Crayfish Dissection

Crayfish structures that you need to know

External:
  • 2 pairs of antennae
  • Exoskeleton
  • Mouth
  • Mandibles
  • Maxilla
  • Cephalothroax
  • Carapace
  • Compound eyes
  • Swimmerets (Pleopods)
  • Uropod
  • Telson
Internal Anatomy
  • Gills
  • Stomach
  • Gonads
  • Heart
  • Esophagus
  • Digestive gland
  • Green glands (excretory)
  • Ventral ganglia 
  • Brain 
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  • Home
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      • Otters at Trowel Shop Pond
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