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Evolution of Aristotle's lantern
Description Cidarids and diademataceans have teeth with an U-shaped cross section. Stirodont echinaceans evolved mechanically stronger t-shaped (or keeled) teeth evolved. In the camarodont echinaceans the plates of the jaw apparatus (pyramids) are connected by a bow (epiphysis), which further increases their strength. Cross sections of teeth are shown in solid black.No scale. JPG file - 136.82 kB - 1 329 x 791 pixels added on 2005-02-231 614 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke
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