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Gastropoda - Calyptraeidae
It was Crepidula (Spirocrypta) by Clark (1938); it was synonymized subjectively with Crepidula by Moore (1976); it was reranked as Spirocrypta by Sepkoski (2002) and Saul and Squires (2008).
It was assigned to Crypta by Gabb (1864); to Crepidula by Clark (1938); to Neotaenioglossa by Sepkoski (2002); and to Trichotropidae by Saul and Squires (2008).
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.