, pl. Septa, adj. Septal a plate, or more or less fused alignment of spines, forming a longitudinal division within a corallite. In transverse view a septum is orientated more or less radially between the marginal zone and the axis. Typical septa extend upwards from the proximal part of a corallite and extend axially from the thecal wall (if present), though in some taxa they may be detached from the wall. In transverse corallite view, septa occur in radiating groups focused around the corallite centre. Some septa consist only of radial spines, or longitudinal ridges on the inside of the corallite wall.


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This version was contributed by Ken Johnson on 22-Apr-2008 14:35.

Page authors include: Ken Johnson. Please contact the editor if you would like to contribute to the definition of this term.
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