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Trilobita - Phacopida - Encrinuridae
It was assigned to Staurocephalinae by Nikolaisen (1961); to Staurocephalidae by Kielan (1957), Owen and Bruton (1980) and Kielan-Jaworowska et al. (1991); to Phacopida by Sepkoski (2002); and to Encrinuridae 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.