Order Phacopida, Suborder Cheirurina, Family Cheiruridae (Vela, 2007)
and 20 mm long
Tanssikhte, Zagora, Morocco
This plate displays a rarely seen example of a trilobite found in
the Ordovician deposits of Tanssikhte near Zagora, Morocco. This
taxon has dramatically sweeping genal, pleural, and pygidial spines.
The spines presumably in addition to a deterrent to predators probably
served to keep the trilobite near the surface of the substrate,
much as snowshoes do. This is a very fine, 3-D example of the type,
unusual for Ordovician trilobites.