Illaenus crassicauda

Illaenus crassicauda is a species of trilobites belonging to the family Illaenidae. These trilobites lived in the middle Ordovician and in the Silurian age. Fossils of this species have been found in the sediments of Sweden and Russia.

Etymology

The Latin species name crassicauda means "fat-tailed", with reference to the shape of the pygidium.

Description

Illaenus crassicauda can reach a length of about. These trilobites are without glabella and without articulation of the tail. The cephalon has a high profile. The large bulbous head are distant from the axis of the head, close to the margin.