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Gastropoda - Bellerophontida - Pterothecidae
It was reranked as Patellilabia (Phragmosphaera) by Blodgett et al. (1999).
It was assigned to Knightitinae by Rollins et al. (1971); to Patellilabia by Blodgett et al. (1999); to Bellerophontida by Sepkoski (2002); and to Carinaropsinae by Knight et al. (1960) and Wagner (2020).
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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.