Encrinurus is a long-lived genus of phacopid trilobites that lived in what are now Africa, Asia, Australia, Europe, North America, and South America from the middle Ordovician to the early Devonian from 472 to 412.3 mya, existing for approximately .PaleoBiology Database: Encrinurus, basic info
Taxonomy Encrinurus was named by Emmrich in 1844.H. F. Emmrich. 1844. Zur Naturgeschichte der Trilobiten Jell and Adrain (2003) list it as a currently valid genus name within the Phacopida, specifically within the Encrinuridae.P. A. Jell and J. M. Adrain. 2003. Available generic names for trilobites. Memoirs of the Queensland Museum 48(2):331-553
References
Further reading Fossils (Smithsonian Handbooks) by David Ward Trilobites by Riccardo Levi-Setti Invertebrate Palaeontology and Evolution by E.N.K. Clarkson Trilobites: Common Trilobites of North America (A NatureGuide book) by Jasper Burns