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Bivalvia - Ostreida - Gryphaeidae
It was reranked as Pycnodonte (Phygraea) by Vyalov (1936), Gliozzi and Malatesta (1983), Squires and Demetrion (1990) and Kiessling (2003).
It was assigned to Pterioida by Sepkoski (2002); and to Pycnodonte by Vyalov (1936), Gliozzi and Malatesta (1983), Squires and Demetrion (1990) and Kiessling (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.