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Clypeasteroida (apical systems)
Description Left: The apical system includes presumably only genital plate G2 and very small terminal plates (Clypeaster australasiae). Right: The hydropores lie in a distinct furrow (Laganum laganum). In some groups there are four gonopores, the posterior one being absent. Sometimes the apical disc is star-shaped and the gonopores have shifted into the interambulacra.
JPG file - 158.36 kB - 1 645 x 783 pixels
added on 2005-02-23817 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha...
© 2005 Schultz, Heinke
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