Oospira cornea (H.C. Küster, 1844)
Elia corpulenta (L. Pfeiffer, 1848)
Albinaria corrugata (J.G. Bruguière, 1792)
Albinaria corrugata doerfleri A.J. Wagner, 1924
Albinaria corrugata draparnaudi (H.H. Beck, 1837)
Albinaria corrugata inflata (G.A. Olivier, 1801)
Albinaria corrugata purpurea N. Reitsma, 1988
Albinaria corrugata turgida (A.J. Wagner, 1924)
Renschiphaedusa corticina (L. Pfeiffer, 1842)
Neostyriaca corynodes (F. Held, 1836)
Neostyriaca corynodes brandti M. Klemm, 1969
Neostyriaca corynodes evadens M. Klemm, 1969
Neostyriaca corynodes saxatilis (J.D.W. Hartmann, 1844)
Neostyriaca corynodes styriaca (A. Schmidt, 1856)
Neniopsis cossmanni H. Nordsieck, 2002
Mauritanica cossoni A. Letourneux, 1887
Stabilea costata (C. Pfeiffer, 1828)
Stabilea costata commutata (E.A. Rossmässler, 1836)
Stabilea costata curta (E.A. Rossmässler, 1836)
Stabilea costata franconica P. Ehrmann, 1933
Stabilea costata fusca (F.E. De Betta, 1855)
Stabilea costata intermedia (L. Pfeiffer, 1847)
Stabilea costata psila (C.A. Westerlund, 1884)
Stabilea costata silesiaca (A. Schmidt, 1868)
Stabilea costata subcostata (O. Böttger, 1879)
Stabilea costata ungulata (E.A. Rossmässler, 1838)
Balea costellata (N.H. Odhner, 1960)
Thaumatoptyx costellata H. Nordsieck, 2005
Omanillya costellata (FOSSIL) H. Nordsieck, 2015 †
Euphaedusa costifera H. Nordsieck, 2001
Stereophaedusa costifera J.T. Kuroda & Is. Taki,1944
Balea costigera (N.H. Odhner, 1960)
Oospira coudeini A.R.J.B. Bavay& P. Dautzenberg, 1899
Columbinia cousini (F.P. Jousseaume, 1900)
Siciliaria crassicostata (L. Pfeiffer, 1856)