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Gastropoda - Pleurotomariida
It was reranked as the order Pleurotomariida by Nützel and Ketwetsuriya (2016) and Nützel et al. (2018).
It was assigned to Archaeogastropoda by Knight et al. (1960) and Stilwell et al. (2004); and to Vetigastropoda by Nützel and Ketwetsuriya (2016), Wagner (2017) and Nützel et al. (2018).
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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.