Illaenus

Illaenus Temporal range:
Illaenus sarsi from Sweden
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.

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 Archived 2012-03-24 at the Wayback Machine