Corals

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  • Corals
    • Morphology
      • Epitheca
      • Coralite
      • Septa
      • Growth lines
      • Tabula
      • Calice
      • Dissepiments
      • Columella
      • Nematoblasts
    • Mode of life
      • Benthonic, Sessile
      • Symbiotic relationship with zooxanthellae
      • Clear shallow seas
      • Between 30 degrees north and south of the equator
      • High energy environment
      • Fully marine (30-40ppt salinity)
      • Temperature between 23 and 27 degrees C
      • Reefs
        • Atoll
          • ring shaped reef found far offshore. Form due to hotspot activity where volcanoes create an area of shallow sea
        • Fringe
          • Where reef meets the land
        • Barrier
          • Separated from the land by a lagoon
    • Types of coral
      • Tabulate
        • Cambrian to permian (Extinct)
        • Mural pores may be present
        • Radial symmetry
        • Columella not present
        • Many small corallites
      • Scleractinian
        • Triassic to Recent (Extant)
        • Tabulae always present
        • Dissepiments always present
        • E.g: Thecosmilia
        • Major septa at 6 radial points
      • Rugose
        • Columella always present
        • Bilateral symmetry
        • Large corallites
        • Ordovician to permian (extinct)
        • Tabulae always present
        • Dissepiments sometimes present
        • No mural pores
        • Colonial or solitary
        • Major septa at 6 points with 4 sets of minor septa
        • E.g: Lithostrotian
    • Cnidaria, Anthozoa

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