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phylum Arthropoda Triarthrus is a genus of Upper Ordovician ptychopariid trilobite found in New York, Ohio, Kentucky, and Indiana, eastern and northern Canada, China and Scandinavia. It is the last of the Olenid trilobites, a group which flourished in the Cambrian period.

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Class Trilobita
order Ptychopariida
family Olenidae
genus Triarthrus