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Trilobita - Phacopida - Homalonotidae
It was assigned to Trilobita by Gutiérrez-Marco and Babin (1999); to Phacopida by Sepkoski (2002); to Homalonotidae by Jell and Adrain (2003); and to Colpocoryphinae by Congreve and Lieberman (2008).
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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.