Trilobites
Order Corynexochida, Suborder Illaenina, Superfamily Illaenoidea,
Family Illaenidae
Geologic Age: Middle Ordovician
Trilobite
is 85 mm long
Lasnamjagi Horizon, St. Petersburg region, Wolchow river, Russia
Remark: Note the high degree of effacment of both the cephalon which is
thought to have aided the trilobite in plowing through the substrate in
search
of
a meal, and also the pygidium, which may have aided in backing down into
the muck to high from predators.
Also see:
Russian Trilobites |