Illaenus

Illaenus is a genus of trilobites from Russia and Morocco, from the middle Ordovician.

Illaenus
Temporal range: Middle Ordovician
Illaenus tauricornis from Russia. On display at the Museo Civico di Storia Naturale di Milano
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Corynexochida
Family:
Illaenidae
Genus:
Illaenus

Dalman, 1827

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.[1][2]

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

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See also
  • Ordovician fauna of Putilovo village

References
  1. Archive.org
  2. Fossil Museum
  3. The Paleobiology Database
  • Yvonne Howells, "Ordovician Trilobites of St. Petersburg Region"


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