Crepidula Lessonii

''Crepidula'', commonly known as the slipper snails, slipper limpets, or slipper shells, is a genus of sea snails, marine gastropod mollusks in the family Calyptraeidae. This family includes the slipper snails (''Crepidula''), hat snails (''Calyptraea''), spiny slipper snails (''Bostrycapulus''), and cup-and-saucer snails (''Crucibulum'') as well as ''Crepipatella'', ''Siphopatella'', ''Grandicrepidula'', and '' Maoricrypta''.Bouchet, P.; Gofas, S. (2011). Crepidula Lamarck, 1799. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137722 on 2011-05-21

These recent changes in the definition of ''Crepidula'' are based on both DNA sequence data as well as anatomical work. Dissections of various calyptraeids show that species that are now placed in ''Grandicrepidula'' and ''Maoricrypta'' are anatomically very different from the true ''Crepidula''. If only the shells are examined this difference is not apparent. This distinction is supported by DNA sequence data from 3 genes (COI, 16S and 28S).

The genus ''Crepidula'' is probably the best studied group within the calyptraeids. A variety of species are commonly used in developmental, ecological, and behavioral research. They have been the major focus of research on protandrous sex-change in marine invertebrates and have been used to demonstrate that sex change is environmentally mediated (the timing of sex change depends on association with other individual snails). ''Crepidula fornicata'' and '' Crepidula onyx'' are well-studied examples of invasive, exotic species in marine habitats.

Due to their simple shells and plastic morphology, calyptraeid taxonomy is challenging. In many cases distinct species with similar-looking shells have been lumped into a single species with either global or unusual distributions. In these cases close examination of the mode of development or of DNA data is vital to verify the species identity. Because such taxonomic lumping is difficult to clear from the internet or from the literature many species range estimates available on the internet include dubious data or data from species that have been taken out of synonymy.

Species

Species within the genus ''Crepidula'' include:

* ''Crepidula adunca'' G. B. Sowerby I, 1825
* ''Crepidula aeola'' Dall, 1927
* ''Crepidula aplysioides'' Reeve, 1859Rosenberg, G. (2010). ''Crepidula aplysioides'' Reeve, 1859. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532682 on 2011-01-11
* ''Crepidula arenata'' Broderip, 1834
* ''Crepidula argentina'' Simone, Pastorino & Penchaszadeh, 2000
* ''Crepidula atrasolea'' Collin, 2000
* ''Crepidula badisparsa'' Collin, 2005
* ''Crepidula cachimilla'' Cledon, Simone & Penchaszadeh, 2004
* ''Crepidula carioca'' Simone, 2006
* ''Crepidula cerithicola'' (C.B.Adams, 1852)
* ''Crepidula complanata'' Krauss, 1848
* ''Crepidula convexa'' Say, 1822 - synonym: ''Crepidula glauca''
* ''Crepidula coquimbensis'' Brown & Olivares, 1996
* ''Crepidula cymbaeformis'' Conrad, 1844
* ''Crepidula depressa'' Say, 1822
* '' Crepidula derjugini'' Golikov & Kussakin, 1962
* ''Crepidula excavata'' Broderip, 1834
* ''Crepidula fimbriata'' Reeve, 1859
* ''Crepidula fornicata'' (Linnaeus, 1758) - Common slipper shell, common Atlantic slippersnail, boat shell, quarterdeck shell.
* '' Crepidula glottidiarum'' Dall, 1905
* ''Crepidula goreensis'' Gmelin, 1791
* ''Crepidula huertae'' Collin, 2019
* ''Crepidula incurva'' (Broderip, 1834)
* '' Crepidula intratesta'' Simone, 2006
* '' Crepidula lessonii'' (Broderip, 1834)
* '' Crepidula maculosa'' Conrad, 1846
* ''Crepidula margarita'' Simone, 2006
* ''Crepidula marginalis'' Broderip, 1834
* '' Crepidula moulinsii'' Michaud, 1829
* ''Crepidula naticarum'' Williamson, 1905
* ''Crepidula navicella'' (Lesson, 1831)
* '' Crepidula navicula'' (Mörch, 1877)
* ''Crepidula nivea