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Bivalvia - Ostreida - Gryphaeidae
It was reranked as Pycnodonte (Crenostrea) by Woodring (1982), Moore (1987) and Perrilliat (1994).
It was assigned to Pycnodonteinae by Vokes (1980) and Beu et al. (1990); to Pycnodonte by Woodring (1982), Moore (1987) and Perrilliat (1994); and to Pterioida 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.