Arctinurus boltoni is a large (up to 30 cm) lichid trilobite of the mid-Silurian. This trilobite reached about eight inches in length, though the normal adult carapace was about four inches. It lived in moderately deep-water in semi-tropical regions. Arctinurus fossils have been found in Europe and North America.

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Quick Facts Scientific classification, Binomial name ...

Arctinurus Temporal range: Wenlock–Ludlow PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Arctinurus boltoni in the Field Museum of Natural History.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Lichida
Family:	†Lichidae
Genus:	†Arctinurus Castelnau, 1843
Species:	†A. boltoni
Binomial name
†Arctinurus boltoni (Bigsby, 1825)

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Arctinurus was first reported during the construction of the Erie Canal through soft Silurian shales and mudstones in upstate New York.^[1] Before the late 1990s, complete Arctinurus fossils were very rare. The vast majority of complete specimens were commercially mined near Middleport New York, USA, in a shallow quarry in the Rochester Formation, and the trilobite is now relatively common in museum, university and private collections. Arctinurus tended to have epibionts attached to the carapace.