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Gastropoda - Fissurellidae
It was reranked as Fissurella (Cremides) by Knight et al. (1960), Weisbord (1962), Todd (2001) and Landau et al. (2016).
It was assigned to Archaeogastropoda by Sepkoski (2002); and to Fissurella by Knight et al. (1960), Weisbord (1962), Todd (2001) and Landau et al. (2016).
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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.