Advanced Invertebrates Csn
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  • 1. Advanced Invertebrates Circulation Support, Growth & Movement Nervous Systems (cont’d)
  • 2. Circulation
    • mollusks
      • bivalves and gastropods – open w/ hemolymph & heart
      • cephalopods – closed w/ heart
    • annelids – closed w/ aortic arches
    • arthropods
      • crustaceans – open
      • chelicerates – open
      • uniramians – open w/ heart & aorta
    • echinoderms – cellular diffusion
  • 3. Support, Growth & Movement
    • mollusks
      • Gastropods
        • have 1 shell
        • exhibit torsion
        • move w/ wavelike contractions of foot
      • Bivalves
        • have 2 shells
        • move with “hatchet foot” extruded from body
  • 4. Support, Growth & Movement
    • mollusks
      • Cephalopods
        • jet propulsion
        • stabilize with fins sometimes
        • can crawl
        • very malleable body
  • 5. Support, Growth & Movement
    • annelida
      • longitudinal muscles
      • circular muscles
      • parapodia – stumpy leg-like appendages
      • setae – bristle like hairs
  • 6. Support, Growth & Movement
    • arthropods
      • molt to grow larger – shed exoskeleton
      • unprotected until new exoskeleton hardens
      • many muscles
      • jointed appendages allow full range of motion
  • 7. Support, Growth & Movement
    • echinodermata
      • metamorphosis from bilaterally symmetrical larvae called bipinnaria to radially symmetrical adult
      • movement with a water vascular system
  • 8. Neural Control & Sensory Organs
    • annelids
      • chain of ganglia
      • ventral nerve cord connects ganglia in each segment
      • setae
  • 9. Neural Control & Sensory Organs
    • arthropods
      • crustaceans
        • paired ganglia
        • pair of branched antenna & pair of antennules, sensory hairs
        • compound eyes on stalks
      • chelicerates
        • brain
        • simple eyes: usually three or more
      • uniramians
        • brain & ventral nerve cord
        • paired ganglia in each segment
        • antenna & sensory hairs
        • simple & compound eyes
        • tympanum: sound sensing
  • 10. Neural Control & Sensory Organs
    • echinodermata
      • nerve ring
      • radial nerves