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Trilobita - Ptychopariida - Olenidae
It was reranked as Olenellus (Olenus) by Ford (1871).
It was assigned to Olenellus by Ford (1871); to Ptychopariida by Sepkoski (2002); and to Olenidae by Bao and Jago (2000) and 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.