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Gastropoda - Sinuopeidae
It was reranked as Sellinema by Knight et al. (1960) and Sepkoski (2002).
It was assigned to Craspedostoma by Perner (1903); to Sinuopeinae by Knight et al. (1960); and to Archaeogastropoda by Sepkoski (2002).
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.