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Gastropoda - Calyptraeidae
It was reranked as Crucibulum (Bicatillus) by Martin (1905); it was reranked as Calyptraea (Bicatillus) by Oostingh (1935), Harzhauser (2002) and Mandic and Steininger (2003).
It was assigned to Crucibulum by Martin (1905); to Calyptraeidae by Lozouet et al. (2001); to Neotaenioglossa by Sepkoski (2002); and to Calyptraea by Oostingh (1935), Harzhauser (2002) and Mandic and Steininger (2003).
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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.