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Species of trilobites belonging to the family Illaenidae From Wikipedia, the free encyclopedia
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]
| Illaenus crassicauda Temporal range: | |
|---|---|
| |
| 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 | |
The Latin species name crassicauda means "fat-tailed", with reference to the shape of the pygidium.
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]
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