EOSC 326 Lecture Notes - Corallite, Scleractinia
9 Dec 2012
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Document Summary
Differences between scleractinian and rugose coral structure: rugose coral: First 2 septa are at 180 degrees from one another. Cardinal septum and counter septum (middle column, cross-section a) Grows 4 more septa inserted, this patterned is repeated (middle column, cross-section b) septa inserted in cycles of four (middle column cross-section. Septa always inserted in cycled of four and are inserted in areas (a),(b),(c), and (d) Insertion method used by rugose coral can leave gaps between septa in up to four different areas of corallite. Side of coral examined some septa project at an angle and run into one another rather than run in parallel for entire length: scleractinian coral: Scleractinian corals septa at all growth stages always insert in cycles of six. Method of septal insertion no gaps. Side of coral examined septa are parallel to one another, running straight up and down length of coral.
