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 826 species of Ptychopariida, in 373 genera and 45 families. This order has been around since the cambrian period. They are fast moving animals.

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EOL has data for 10 attributes, including: