Trilobites Order Corynexochida, Suborder Illaenina, Family Illaenidae
Time: Middle Ordovician
(25.4 mm = 1 inch): 79 mm long by 39 mm wide on a 90 by 30 mm matrix
Asery Horizon deposits of the Wolchow River region near Saint Petersburg,
This is an example of the rarely offered trilobite, Illaenus incisus.
The genus derives its specific name from the cut (incised) appearance
to its thoracic segments, This is one of the 50-odd members of the
genus, and known for the high profile of the cephalon which is thought
to have aided the trilobite in plowing through the substrate in search
of a meal. This one is presented wrapped atop its matrix that has
a flattened base for display from any aspect.
Also see: Russian
picture to enlarge