Illaenus
incisus
Trilobites Order Corynexochida, Suborder Illaenina, Family Illaenidae
Geologic
Time: Middle Ordovician
Size
(25.4 mm = 1 inch): 79 mm long by 39 mm wide on a 90 by 30 mm matrix Fossil Site:
Asery Horizon deposits of the Wolchow River region near Saint Petersburg,
Russia
 Description:
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
trilobites |
|
