Illaenus crassicauda

Illaenus crassicauda Temporal range: Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Illaenus crassicauda from Sweden, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Corynexochida
Family:	†Illaenidae
Genus:	†Illaenus
Species:	†I. crassicauda
Binomial name
†Illaenus crassicauda Wahlenberg 1826

Illaenus crassicauda is a species of trilobites belonging to the family Illaenidae. These trilobites lived in the middle Ordovician and in the Silurian age (443 - 418 million years ago). Fossils of this species have been found in the sediments of Sweden and Russia.[1][2]

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 14 centimetres (5.5 in). 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.[3]

References

1. Paleobiology Database
2. Europeana. Archived 2014-11-03 at the Wayback Machine
3. Archive.org

• V. Jaanusson Zur Fauna und zur Korrelation der Kalksteine mit Illaenus crassicauda (sog. Flagkalk) im Siljan-Gebiet Dalarnas Geologiska Föreningen i Stockholm Förhandlingar - Volume 69, Issue 1, 1947

External links

• Fossil ID