cardinal septum

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One of the initial septa (vertical plates within the coral skeleton) which occur in rugose corals (Rugosa). When the coral is very young a single proseptum develops in the calyce. This soon separates into two, one called the ‘cardinal septum’, the other the ‘counter-cardinal septum’. Other septa then follow to make up the arrangement of septa.

Subjects: Earth Sciences and Geography.

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