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Rhynchonellata - Spiriferida - Acrospiriferidae
It was reranked as Hysterolites (Acrospirifer) by Amsden and Ventress (1963).
It was assigned to Hysterolites by Amsden and Ventress (1963); to Hysterolitinae by Johnson (1995); to Spiriferida by Sepkoski (2002); and to Acrospiriferinae by Williams et al. (2006) and Boucot et al. (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.