Illaenus dalmani


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

 

 

 

 

 

 

Illaenus dalmani Corynexochida Trilobite

Illaenus dalmani RussianTrilobite

The Cephalon is highly effaced and smooth:

The Cephalon is highly effaced and smooth

So too the pygidium is highly effaced and smooth:

The pygidium is highly effaced and smooth

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