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Gastropoda - Bursidae
It was recombined as Bursa nana by Pilsbry and Olsson (1941); it was recombined as Bursa (Colubrellina) nana by Hertlein and Strong (1955); it was recombined as Bursa (Marsupina) nana by Beu (1985); it was recombined as Marsupina nana by Cantalamessa et al. (2005) and Beu (2010).
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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.