big size! Xiphosurida ind. - Ordovician - Fezouata formation

Xiphosurida ind.

Ordovician

Upper Fezouata formation

Zagora, Morocco

the latest stage in the ontogeny of this species, not yet published. 

The specimens that we usually see are smaller and have a very different morphology.

For more informations about fossils of the Fezouata Formation :

REVUE FOSSILES N°31

and

FOSSILS FROM MOROCCO VOLUME 2A: EMBLEMATIC LOCALITIES FROM THE PALAEOZOIC OF THE ANTI ATLAS