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Rhynchonellata - Spiriferinida - Spiriferinidae
It was reranked as Mentzelia by Sepkoski (2002), Williams et al. (2006), He and Chen (2016) and Guo et al. (2019).
It was assigned to Spiriferina by Quenstedt (1871), Bittner (1912) and De Toni (1913); to Spiriferida by Sepkoski (2002); and to Mentzeliinae by Williams et al. (2006), He and Chen (2016) and Guo et al. (2019).
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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.