Illaenus
From Wikipedia, the free encyclopedia
| Illaenus Temporal range: | |
|---|---|
 | |
| Illaenus tauricornis from Russia. On display at the Museo Civico di Storia Naturale di Milano | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita |
| Order: | †Corynexochida |
| Family: | †Illaenidae |
| Genus: | †Illaenus Dalman, 1827 |
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]
This genus includes about 50 species:[3]
- †Illaenus alveatus Raymond 1925
- †Illaenus auriculatus Ross Jr. & 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 slancyensis Krylov 2016
- †Illaenus spiculatus Whittington 1963
- †Illaenus tauricornis Kutorga 1848
- †Illaenus tumidifrons Billings 1865
- †Illaenus utahensis Hintze 1952
- †Illaenus welchi Loch & Ethington 2017
