Trilobites from Morocco are often large and three dimensional.
The Hollardops, Reedops, and Gerastos trilobites are laboratory
prepared, but not with the great care and extensive amount of
time required for the finest results, have minor flaws, but
preservation is generally good (see Edcope Enterprises for truly
world class and rare Moroccan Trilobites). The Diacalymene is
what is known a body fossil, essentially an internal cast where
exoskeleton is no longer present as a separate hard skin. The
and Diacalymene are all members of Class
Trilobita Order Phacopida,
a very diverse group that lived from the Ordovician through the
Devonian. Phacopids are renowned for their amazing schizochroal
lenses, for which a couple of close
below. The Gerastos trilobite is a member of Trilobite
Order Proetida that lived from the Ordovician to the Permian.
It was, in fact, the last order of trilobite to go extinct, finally
out in the Permian-Triassic extinction even (PT extinction).
The proetids tended to be diminutive trilobites.
small collection of four trilobites offers a great value to start
a collection, or to provide a gift to the young aspiring collector.
It also represents a great science or evolution teaching tool,
given the anecdotal facts cited above.