|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Ptychopariida - Olenidae
It was assigned to Triarthrinae by Poulsen (1959); to Oleninae by Robison and Pantoja-Alor (1968); to Balnibarbiinae by Fortey and Droser (1999); to Ptychopariida by Sepkoski (2002); and to Olenidae by Jell and Adrain (2003).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.