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Photo Gallery » Species » Echinodermata (Echinoderms) » Echinoidea (sea urchins)
Atelostomata (oral plate pattern)
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. Author Schultz, Heinke JPG file - 411.56 kB - 3 050 x 1 486 pixels added on 2009-02-233 034 viewsERMS taxaScan of drawing Spatangoidachecked Kroh, Andreas 2021-02-24Scan of drawing Atelostomatachecked Kroh, Andreas 2021-02-24Scan of drawing Holasteroidachecked Kroh, Andreas 2021-02-24 From reference Schultz, H. (2009). Sea urchins II: Worldwide irregular d... Download full sizeDownload full size © 2009 Schultz, Heinke
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