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

See also

• Ordovician fauna of Putilovo village

References

• Yvonne Howells, "Ordovician Trilobites of St. Petersburg Region"

External links

• Russian Trilobites
• Saint Petersburg Paleontological Laboratory