Hier ist ein Fossiler Seeigel aus Ried welcher wohl zur Gattung Pseudodiadema zu stellen ist.
Der fossile Seeigel selber misst etwa 10 mm im Druchmesser.

This is a  fossil see urchin that belongs to the species Discoidea karakaschi it was found on the Crimea, Ukraine (or Russia).

Here is a rare record of a fossil echinoid of the species Discoidea karakaschi from the Crimea.

Here we have detailed specimen of a fossil  See urchin of the soundfull species Laganum depressum from Egypt.

Here is a Fossil See urchin of the species Laganum depressum from Hurghada in Egypt.

Here is a spezial specimen of a fossil echinoid of the species Microcyphus rousseaui.
This capsule of Microcyphus rousseaui was threaded on to the sting of another sea urchin genus, so to speak. This is a natural embedding and to no assembly.

This is a small but detailed regular sea urchin which belongs to the genus Phymosoma. 
This fossil echinoid from Painten snows many spines.
These spine  have a longitudinal striated ornamentation

Here is a rarely offered fossil sea urchin made of the Treuchtlingen marble of the genus Phymosoma.

Here is a fossil Solnhofen echinoid from the Painten Site. The fossil Tetragramma is completely preserved with the spines and the Aristotle's lanten.

Here is a fossil Solnhofen echinoid from the Painten Site. The fossil Tetragramma is completely preserved with the spines and the Aristotle's lanten.