Crepidula lirata (FOSSIL) T.A. Conrad, 1833 † USA, Louisiana
Sigapatella maccoyi (FOSSIL) (H.H. Suter, 1917 †)
Crepidula maculosa T.A. Conrad, 1846 Florida22,9 mm
Calyptraea mamillaris W.J. Broderip, 1834 El Salvador10 mm
Sigapatella mapalia (FOSSIL) J. Marwick, 1929 † New Zealand, Otago, Clutha
Crucibulum marense N.E. Weisbord, 1962 Venezuela24 mm
Crepidula margarita L.R.L. Simone, 2006 Brazil, Bahia
Crepidula marginalis (W.J. Broderip, 1834) West Panama27 mm
Crepidula matajiroi (FOSSIL) J. Makiyama, 1957 † Japan
Maoricrypta monoxyla (R.P. Lesson, 1831) New Zealand, Leigh24,2 mm
Crucibulum monticulus S.S. Berry, 1969 Ecuador
Crepidula moulinsii A. Michaud, 1829 Tunisia5 mm
Crucibulum multilineatum (FOSSIL) T.A. Conrad, 1842 † USA, Florida, Pinellas
Crepidula mytiloidea (FOSSIL) L.M.D. Bellardi& O.G. Michelotti, 1840 † Italy, Tortona
Crepidula naticarum M.B. Williamson, 1905 Guatemala
Crepidula navia (FOSSIL) M. Yokoyama, 1925 † Japan, Niigata
Crepidula navicella (R.P. Lesson, 1831)
Crepidula navicula O.A.L. Mörch, 1877 Bahamas
Crepidula nidatoriensis (FOSSIL) Y. Otuka, 1934 † Japan, Kitakami massif
Crepidula nivea C.B. Adams, 1852 Tumbes, Peru18,2 mm
Crepidula norrisiarum (M.B. Williamson, 1905) California, Laguna beach9 mm
Sigapatella novaezelandiae (R.P. Lesson, 1831) New Zealand, Auckland20,9 mm
Sigapatella nukumaruana (FOSSIL) B.A. Marshall, 2003 †
Crepidula nummaria A.A. Gould, 1846 Washington19,6 mm
Trochita occidentalis (FOSSIL) Gray, 1850 †
Crepipatella occulta Veliz, H. Winkler, Guisados& R. Collin, 2012 Chile, Coquimbo
Bostrycapulus odites R. Collin, 2005 Brazil, Sao Paulo16 mm
Sigapatella ohopeana (FOSSIL) B.A. Marshall, 2003 †
Crepidula onyx Sowerby, 1824 Mexico, Baja California29 mm
Crepipatella orbiculata (W.H. Dall, 1919) Canada, Vancouver Island
Trochita ornata (FOSSIL) B. de Basterot, 1825 † France, Aquitaine36 mm
Sigapatella otamatea (FOSSIL) C.R. Laws, 1944 †
Crepidula parisiensis (FOSSIL) A.E.M. Cossmann, 1883 †
Trochita parvula (FOSSIL) R.A. Philippi, 1887 † Chile, Navidad Formation5 mm
Sigapatella patulosa (FOSSIL) Powell & J.A. Bartrum,1929 †