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Trilobita - Lichida - Lichidae
It was reranked as Acanthopyge (Perunaspis) by Thomas and Holloway (1988).
It was assigned to Proetidae by Přibyl (1949); to Acanthopyge by Thomas and Holloway (1988); to Lichida by Sepkoski (2002); and to Lichidae by Vaněk (1959) 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.