Illaenus
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. 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.This genus includes about 50 species:
- 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
