Arctic Ocean and Lena River basin, Haraulah mountains, Siberia, Russia
Late Cambrian (Paibian Stage)
This specimen is not only large for the species, it is large for the entire order. The species' highly wrinkled carapace is unusual.
This trilobite is used as as an index fossil. Its first appearance in the Huaqiao Formation in Hunan, China is used to define the start of the Paibian, the 8th stage of the Cambrian, which is taken as the start of the Late Cambrian.
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