Nuculites kimuari (FOSSIL) I. Hayasaka, 1924 †
Katadesmia kolthoffi (R. Hägg, 1904)
Malletia korsakovi (FOSSIL) Krishtofovich, 1964 †
Sluha kosoviensis (FOSSIL) Barrande, 1881 †
Malletia kurasiensis (FOSSIL) Krishtofovich, 1964 †
Palaeoneilo leiyangensis (FOSSIL) H.X. Liu, 1976 †
Perrisonota littlei (FOSSIL) Gardner, 1916 †
Malletia longa (FOSSIL) Krishtofovich, 1954 †
Gonionuculites longiusculus (FOSSIL) (Beushausen, 1895 †)
Palaeoneilo lutosa (FOSSIL) Talent, 1963 †
Malletia magellanica (E.A. Smith, 1875)
Palaeoneilo magna (FOSSIL) Tschernyschew, 1947 †
Katadesmia malita (A. Sanders & J.A. Allen,1985)
Neilo maxwelli (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Palaeoneilo mcchesneyana (FOSSIL) (Girty, 1910 †)
Palaeoneilo megaptera (FOSSIL) Beushausen, 1895 †
Malletia nasuta (FOSSIL) J. Marwick, 1931 †
Nuculites neglectus (FOSSIL) (J.W. Hall, 1862 †)
Malletia neptuni K.H.J. Thiele& S.G.A. Jaeckel, 1931
Taiwannuculana nigromaculata (T.A. Okutani, 1983)
Nuculites oblongatus (FOSSIL) T.A. Conrad, 1841 †
Malletia obtusa (G.O. Sars, 1872)
Palaeoneilo occidentalis (FOSSIL) Guskov & Demskaja, 1984 †
Palaeoneilo ogachiensis (FOSSIL) I. Hayasaka, 1924 †
Taimyrodon olenekensis (FOSSIL) (Kiparisova, 1937 †)
Malletia onorensis (FOSSIL) Lautenschläger, 1964 †
Johnmartinia orbicularis (FOSSIL) (R. Tate, 1896 †)
Carinata ornata (FOSSIL) Volobueva, 1981 †
Neilo ornata (FOSSIL) (Sowerby, 1846 †)
Neilo ornata ortmanni Erdmann & Morra, 1985
Spineilo ornata (FOSSIL) Kalishevich, 1973 †
Malletia ovalis (FOSSIL) Krishtofovich, 1969 †
Nuculites ovalis (FOSSIL) McCoy †
Palaeoneilo oviformis (FOSSIL) (Eck, 1865 †)
Palaeoneilo oweni (FOSSIL) (McChesney, 1859 †)