Paraceraurus exsul

Paraceraurus exsul is a species of trilobite that lived in St. Petersburg Region and Tver Region (in erratic blocks) of Russia, Estonia, Finland (Åland, in erratic blocks), Sweden, North Germany (in erratic blocks), Lithuania and Belarus during the Upper Llanvirnian Stage (463.5-460.9 Ma) [1] of the Middle Ordovician. These trilobites can reach a length of about 16 centimetres (6.3 in). They show a square front edge, large genal spines on the cheeks and characteristic long pygidial spines. Genal spines are curved usually inward and upward.

Paraceraurus exsul
Temporal range: Middle Ordovician
Paraceraurus exsul
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Phacopida
Suborder:
Cheirurina
Family:
Cheiruridae
Genus:
Paraceraurus
Species:
P. exsul
Binomial name
Paraceraurus exsul
(Beyrich, 1846)
Synonyms
  • Cheirurus exsul Beyrich, 1846,
  • Cheirurus exsul Schmidt, 1881,
  • Cheirurus exsul Beyr. Schmidt, 1907
  • Paraceraurus exsul (Beyrich, 1846)

References
  1. Fossilworks
  • Trilobites of the families Cheiruridae and Encrinuridae from Estonia. Geoloogia Instituudi Uurimused (Trud Inst Geol Acad Sci Est SSR) Tallinn, 3 1958: 165–205, 210–212. [Zoological Record Volume 95]
  • V. Klikushin, A. Evdokimov, A. Pilipyuk. Ordovician Trilobites of the St. Petersburg Region, Russia. 2009.


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