''Encrinurus'' is a long-lived

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

of phacopid

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...

s that lived in what are now

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an are ...

Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

, and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sou ...

from the middle

Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...

to the early

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, wh ...

from 472 to 412.3 mya, existing for approximately .

Taxonomy

''Encrinurus'' was named by Emmrich in 1844. Jell and Adrain (2003) list it as a currently valid genus name within the

Phacopida Phacopida ("lens-face") is an order of trilobites that lived from the Late Cambrian to the Late Devonian. It is made up of a morphologically diverse assemblage of taxa in three related suborders. Characteristics Phacopida had 8 to 19 thoraci ...

, 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

* ''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 Encrinuridae genera Ordovician trilobites Silurian trilobites Devonian trilobites Trilobites of Africa Trilobites of Asia Trilobites of Oceania Trilobites of Europe Trilobites of North America Ordovician trilobites of South America Middle Ordovician first appearances Early Devonian genus extinctions Paleozoic life of Ontario Verulam Formation Paleozoic life of British Columbia Paleozoic life of Manitoba Paleozoic life of the Northwest Territories Paleozoic life of Nunavut Paleozoic life of Quebec Fossil taxa described in 1844 {{Phacopida-stub

Taxonomy

References

Further reading