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Sea Urchin
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Description: "Apical disc of sea-urchin. In the centre is the periproct bearing the anus; around it are five genital or inter-radial plates (g.), one of which is modified as the madreporite (m.); beyond these five ocular or radial plates (o.); i.r.a., an inter-radial or inter-ambulacral area, with spines only; r.a., a radial or ambulacral area, with spines and openings for tube-feet." -Thomson, 1916
Source: Thomson, J. Arthur Outlines of Zoology (New York: D. Appleton & Company, 1916) 263
Keywords: echinoderm, sea urchin apical disc, sea urchin parts, madreporite, ambulacral area
Copyright: 2009, Florida Center for Instructional Technology. See license.
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