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 57 mm. 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.

Selected species
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