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Somasteroida

      A class of echinoderms comprising "sea stars"-like animals of generalized structure, the jaws often only partly developed, and the skeletal elements of the arm arranged in a double series of transverse rows termed metapinnules. Their evolutionary history is short - they occur since Lower to the Middle Ordovician. Source: Mergl, 2002 http://www.kbi.zcu.cz/veda/paleontologie/zoopaleontologie/ostnokozci/index.php
Somasteroida
Img. 168: Basic morphology of Somasteroida


 

p4944
Archegonaster pentagonus Spencer, 1951 p4944
p4944b
Archegonaster pentagonus Spencer, 1951 p4944
   

In the Virtual Museum there are total 2 samples

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]