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.

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