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Gastropoda - Trochidae
It was reranked as Trochus (Monodonta) by Gould (1849).
It was assigned to Trochus by Gould (1849); to Archaeogastropoda by Sepkoski (2002); to Gibbulini by Donald et al. (2005); and to Trochinae by Wilson (1993) and Bouchet et al. (2005).
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.