Bostrycapulus aculeatus (J.F. Gmelin, 1791)
Crepidula adunca G.B. I Sowerby, 1825
Crepidula adunca uncata K.T. Menke, 1847
Crepidula aeola W.H. Dall, 1927
Crepidula aesop (FOSSIL) W.H. Dall, 1903 †
Calyptraea africana E. Rolán, 2004
Crucibulum alloglyptum (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †
Calyptraea alta (FOSSIL) (T.A. Conrad, 1854 †)
Sigapatella americana (FOSSIL) A.E. Ortmann, 1900 †
Trochita angusticostata (FOSSIL) B.M. Landau, F. Da Silva& S.M. Heitz, 2016 †
Trochita aperta (FOSSIL) (D.C. Solander, 1766 †)
Crepidula aplysioides L.A. Reeve, 1859
Crepipatella apprimus (FOSSIL) E.H. Vokes, 1975 †
Calyptropsis arachnoideus (FOSSIL) R. Tate, 1893 †
Trochita araucana (FOSSIL) R.A. Philippi, 1887 †
Crepidula arenata (W.J. Broderip, 1834)
Crepidula argentina L.R.L. Simone, G. Pastorino& P.E. Penchaszadeh, 2000
Crepidula atrasolea R. Collin, 2000
Crepidula auricula (FOSSIL) M. Yokoyama, 1924 †
Crucibulum auricula (J.F. Gmelin, 1791)
Calyptraea aurita L.A. Reeve, 1859
Crepidula badisparsa R. Collin, 2005
Calyptraea barnardi R.N. Kilburn, 1980
Calyptroides bolivarensis (FOSSIL) Clark & J.W. Durham,1946 †
Calyptraea burchi A.G. Smith & W.J. Gordon,1948
Crepidula cachimilla Cledón, L.R.L. Simone& P.E. Penchaszadeh, 2004
Crepidula caedes (FOSSIL) C. Nielsen, 2003 †
Sigapatella calyptraeformis (J.B.P.A. Lamarck, 1822)
Bostrycapulus calyptraeiformis (G.P. Deshayes, 1830)
Crepidula cannoni (FOSSIL) E.J. Petuch, 1994 †
Crepidula cantaurana (FOSSIL) F. Hodson, 1931 †
Calyptraea capensis J.R. le B. Tomlin, 1931
Crepipatella capensis (J.R.C. Quoy& J.P. Gaimard, 1835)
Crepidula carioca L.R.L. Simone, 2006
Crepidula cataldi P. Parenzan, 1979