Sunday, 25 September 2011


Coral consist of two layers, an outer endoderm and an inner endoderm. corals have an calcium carbonate skeleton, which is of imense importance in the geological record.

Tabula- horizontal plates dividing the coralite skeleton

calice-Bowl shaped depression where the soft polyp sits

columella- Axial rods which supports the septa, running up the centre of some corals

septa- vertical plates, dividing the corallite skeleton

dissepiments- curved plates connected to septa and tabulae

Rusgose Corals 

  • These extinct corals are either solitary or colonial. the epitheca, or outer layer, is often wrinkled and may be hornshaped.
  • the have 1 plane of symmetry known as bilateral symmetry
  • they have a columella
  • may have dissepiments but not always present
  • usually large

Tabulate Corals

  • These are extinct
  • always colonial
  • usually small
  • they show radial symmetry
  • no speta or undeveloped
  • may have dissepiments
  • dont have a columella
Scleratinian corals 

  • either solitary or colonial
  • usually small
  • radial symmetry hexagonal
  • show 6 primary septa
  • may have disspeiments
  • always have tabulae 

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