Cephalopod

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  • Cephalopods
    • Morphology
      • Soft parts
        • Eye
        • Tentacles
      • Internal
        • Septum
        • Septal neck
        • Siphuncle
        • body chamber
        • Protoconch
        • Apperture
      • External
        • Growth lines
        • Ammonoids
          • Ribs
          • Keel
    • Types of coiling
      • Involute
      • Evolute
      • Planispiral
    • Mode of life
      • Nektonic
        • Lateral movement using tentacles. When in danger, water circulated through the mantle for respiration, is squirted out to propel the organism backwards
        • position in the water column is controlled by the gas to liquid ratio within the empty chambers. Controlled by the siphuncle.
      • Hunter killer
        • cephalopods predated on their prey
    • Evolution
      • Changes in suture lines
        • From simple nautiloid, through Goniatitic, saddle and lobed Ceratitic, to frilly complex ammonitic suture.
      • Changes in internal structure
        • Septal necks change from facing towards the protococh to towards the aperture.
        • siphuncle moves from the centre of the chambers to the other edge.
      • Changes in external structure
        • From unornamented nautiloids to heavily ornamented ammonites
      • Heteromorph
        • Exhibit loose coiling in more than one plane. Often referred to as uncoiled ammonites.
    • First appeared in Cambrian
      • Ammonoids became extinct at the K-T extinction
      • Nautiloids are still extant
    • Mollusca, Cephalopoda

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