Platyscutellum sp.
Trilobites Order Corynexochida, Suborder Illaenina, Superfamily Illaenoidea, Family Styginidae
Size: 46 mm long
Fossil Site: Hamar Laghdad, Zerg, Morocco
 Description:
Here is a rarely seen trilobite: A member of the Order Corynexochida,
Family Thysanopeltidae from the Hamar Laghdad Formation Devonian
deposits
of Zerg, Morocco. It is Platyscutellum, and is distinguished from
Scutellum by the ribbing of the pygidium. The diagnostic feature
is
the row of axial spines, not seen in other relatives. This one is
well-displayed upon its matrix platform, and is quite 3-D in aspect.
Notice the may fine holochroal eye facets. Holochrocal have a very
dense packing of small facets with a single corneal layer covering
all lenses. In living arthropods compound eyes are very sensitive
to motion. It is presumed that these were as well, affording a
good
warning of the approach of would-be predators. |
