Lab 5

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  1. What are the apomorphies of Brachiopoda?
    • Bivalve shell and mantle
    • Brachia: two arms, filters sea water
    • Heart
    • Digestive ceca: pouches in stomach, help digest food
  2. What are the apomorphies of Mollusca?
    • Dorsal mantle has secreted chitin-protein cuticle and calcareous spicules - needle-like structes, make up skeleton
    • Radula: tiny teeth, used to scrape food off surface
    • Foot and paired peda retractor muscles
    • Bipectinate gills
    • Teraneural nervous system
    • Foot for locomotion and food aquisition
  3. What are the apomorphies of Polyplacophora?
    • Eight dorsal, overlapping valves
    • Valves consist of tegmentum and articulamentum
  4. What are the apomorphies of Ganglioneura?
    • Neuron cell bodies concentrated in paired ganglia
    • Single pair of foot retractor muscles
  5. What are the apomorphies of Gastropoda?
    • Torsion: rotation of visceral muscles
    • Usually coiled, asymmetrical
    • Mantle cavity is anterior
    • Streptoneurous nervour system
    • Operculum
    • Left gonad lost
  6. What are the apomorphies of Cephalopoda?
    • Pelagic: inhabits the open sea
    • Chambered shell
    • Hydrostatic organ
    • Carnivorous with beaks, tentacles
    • Extreme cephalization
    • Camera-style eyes
    • Muscular mantle for ventilation and swimming
    • Crystalline style lost
    • Macrolethical eggs with discoid cleavage
  7. What are the apomorphies of Bivalvia?
    • Bivalve shell joined by a dorsal movable hinge
    • Adductor muscles
    • Radula lost
Card Set:
Lab 5
2012-04-02 20:30:58
Lophotrochozoa III

Brachiopoda, Mollusca (Polyplacophora, Gastropoda, Cephalopoda and Bivalvia)
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