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Atelostomata (oral plate pattern)
Description The two extant orders differ in the arrangement of the interambulacral plates posterior to the peristome that form the plastron: Left: Holasteroida: The elongated labrum (1) is connected to a single sternal plate (2) followed by two episternal plates. Right: Spatangoida: The narrow labrum (1) is connected to two enlarged sternal plates (2a/2b) followed by two episternal plates. The plastron carries large tubercles and strong spines specialized for locomotion within the sediment.Scale 20 mm. JPG file - 411.56 kB - 3 050 x 1 486 pixels added on 2009-02-233 010 viewsFrom reference Schultz, H. (2009). Sea urchins II: Worldwide irregular d... © 2009 Schultz, Heinke
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