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Trilobita - Asaphida - Asaphidae
It was reranked as Asaphus (Isotelus) by Owen (1852).
It was assigned to Asaphus by Owen (1852); to Asaphinae by Phleger (1933) and Whittington (1941); to Isotelinae by Henningsmoen (1960) and Owen (1981); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2003) and Owens and Fortey (2009).
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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.