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In page Gastropoda:

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In 2017, Bouchet, Rocroi, and other collaborators published a significantly updated version of the 2005 taxonomy.[6] In the Bouchet et al. taxonomy, the authors used unranked clades for taxa above the rank of superfamily (replacing the ranks suborder, order, superorder and subclass), while using the traditional Linnaean approach for all taxa below the rank of superfamily. Whenever monophyly has not been tested, or is known to be paraphyletic or polyphyletic, the term "group" or "informal group" has been used. The classification of families into subfamilies is often not well resolved.[citation needed]