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Rhynchonellata - Orthida - Plaesiomyidae
It was reranked as Orthis (Dinorthis) by Reed (1917); it was reranked as Plaesiomys (Dinorthis) by Klenina (1984).
It was assigned to Orthis by Reed (1917); to Dinorthidae by Alikhova (1953) and Oraspold (1959); to Plaesiomys by Klenina (1984); to Plaesiomyidae by Macomber (1970) and Popov et al. (2000); to Plaesiomyinae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
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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.