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Arnstein Staverlokk. Norwegian Institute of Nature Research. Arnstein Staverlokk. Year: 2014. Contact: Arnstein Staverlokk.   cc-by-nc-sa-3.0

Ptychopariida is an order of trilobites. There are 596 species of Ptychopariida, in 237 genera and 21 families. It includes groups like Plethopeltidae, Proasaphiscidae, and Norwoodiidae.

EOL has data for 2 attributes, including: