[B] Cephalochordata

    Cards (5)

    • Basic body plan of cephalochordates are dorsoventrally inverted compared to earlier deuterostomes
    • In hemichordates, pharyngeal slits open dorsally
      In chordates, they open ventrally
    • Buccal cirri
      • Functions as a sieve, blocks large particles
    • Wheel organ
      • With ciliated tracts sweeping food into the mouth 
    • Hatschek's pit
      • Secretes mucus to collect food
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