Illaenus
| Illaenus Temporal range: Middle Ordovician | |
|---|---|
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| Illaenus tauricornis from Russia. On display at the Museo Civico di Storia Naturale di Milano | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Trilobita |
| Order: | Corynexochida |
| Family: | Illaenidae |
| Genus: | Illaenus Dalman, 1827 |
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Illaenus is a genus of trilobites from Russia and Morocco, from the middle Ordovician.
Species included in this genus can reach a length of about 57 millimetres (2.2 in). They are without glabella and without articulation of the tail. The cephalon has a high profile and recurved genal spines. Eyes are distant from the axis of the head, situated nearer to the edge.[1][2]
Selected species
This genus includes about 50 species:
- Illaenus alveatus Raymond 1925
- Illaenus auriculatus Ross, Jr. and Barnes 1967
- Illaenus bayfieldi Billings 1859
- Illaenus bucculentus Whittington 1963
- Illaenus consimilis Billings 1865
- Illaenus consobrinus Billings 1865
- Illaenus crassicauda Wahlenberg 1826
- Illaenus fraternus Billings 1865
- Illaenus gelasinus Whittington 1965
- Illaenus lacertus Whittington 1954
- Illaenus marginalis Raymond 1925
- Illaenus oscitatus Fortey 1980
- Illaenus spiculatus Whittington 1963
- Illaenus tauricornis (Kutorga 1848)
- Illaenus tumidifrons Billings 1865
- Illaenus utahensis Hintze 1952
See also
References
- Yvonne Howells, "Ordovician Trilobites of St. Petersburg Region"