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 Holectypoida (oral) Description With their round tests, non-petaloid ambulacra and central peristome they resemble their regular ancestors. The periproct at the posterior oral side is very large.Length 33 mm; Middle Jurassic, Switzerland.JPG file - 272.37 kB - 1 147 x 1 186 pixelsadded on 2005-02-23261 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha...© 2005 Schultz, Heinke Click here to return to the thumbnails overview |
