Illaenus crassicauda Temporal range:
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Fossil of Illaenus crassicauda from Sweden, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification
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Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | † Trilobita |
Order: | † Corynexochida |
Family: | † Illaenidae |
Genus: | † Illaenus |
Species: | †I. crassicauda
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Binomial name | |
†Illaenus crassicauda Wahlenberg 1826
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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]
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]