Echinosphaerites

Echinosphaerites is a genus of rhombiferan echinoderm (a cystoid) that lived in the Early and Middle Ordovician of North America and Europe (Bockelie, 1981). ...
Found on http://en.wikipedia.org/wiki/Echinosphaerites

Echinosphaerites

genus of cystoids, an extinct group related to the sea lily and starfish, found as fossils in Ordovician marine rocks (between 505 and 438 million ...
Found on http://www.britannica.com/eb/a-z/e/7
No exact match found