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Gastropoda - Bellerophontida - Bucaniidae
It was reranked as Bellerophon (Patellostium) by Williams and Breger (1916).
It was assigned to Bellerophontidae by Ulrich and Scofield (1897); to Bellerophon by Williams and Breger (1916); to Grandostomatinae by Horný (1963); to Grandostomatidae by Wahlman (1992); and to Bellerophontida 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.