Periclaraia jinyaensis (FOSSIL) C. Chen & Komatsu, 2002 †
Dhondtichlamys johnsoni (FOSSIL) (Clark, 1895 †)
Pecten johnstrupi Lundgren, 1895
Adamussium jonkersi (FOSSIL) Quaglio & al., 2010 †
Zygochlamys jorgensis (FOSSIL) H.F.A. von Ihering,1907 †
Oppenheimopecten josslingi (FOSSIL) (Smith, 1857 †)
Veprichlamys jousseaumei (A.R.J.B. Bavay, 1904)
Jorgechlamys juliana (FOSSIL) (Ihering 1907) †
Pecten jullieni F.P. Jousseaume, 1882
Caribachlamys jungi (FOSSIL) Waller, 2011 †
Lentipecten kadari (FOSSIL) T. Kotaka & Hasibuan,1983 †
Kotorapecten kagamianus (FOSSIL) (M. Yokoyama, 1923 †)
Mesopeplum kaiparaense (FOSSIL) (Finlay, 1924 †)
Nanaochlamys kakertensis (FOSSIL) V.N. Sinelnikova, 1975 †
Mimachlamys kaneharai (FOSSIL) (Yokoyama, 1926 †)
Chlamys karaginskiensis (FOSSIL) V.N. Sinelnikova, 1975 †
Towaipecten katieae (FOSSIL) A.G. Beu, 1995 †
Mimachlamys kauaiensis (W.H. Dall, P. Bartsch& H.A. Rehder, 1938)
Chlamys kavranensis (FOSSIL) V.N. Sinelnikova, 1975 †
Chlamys kebolintangensis (FOSSIL) Martin, 1909 †
Euvola keepi (FOSSIL) R. Arnold, 1906 †
Talochlamys keiloriana (FOSSIL) (I. Crespin, 1926 †)
Fortipecten kenyoshiensis (FOSSIL) (K. Chinzei, 1960 †)
Pecten keppelianus G.B. III Sowerby, 1905
Mizuhopecten kimurai (FOSSIL) (Yokoyama, 1925 †)
Mizuhopecten kitamiensis (FOSSIL) Satoru & al., 1966 †
Nanaochlamys kitamurai (FOSSIL) (Kotaka 1955) †
Veprichlamys kiwaensis Powell, 1939
Pecten kokcharofi (FOSSIL) de Verneuil, 1845 †
Kotorapecten korfiensis (FOSSIL) V.N. Sinelnikova, 1975 †
Chlamys kotaklensis (FOSSIL) I. Hayami, 1957 †
Chlamys kotorana (FOSSIL) Y. Otuka, 1934 †
Annachlamys kuhnholtzi (A.C. Bernardi, 1860)
Janopecten kularensis (FOSSIL) Archipov & Truschelev,1980 †
Mizuhopecten kulkensis (FOSSIL) (Slodkewitsch, 1938 †)