Ananias nevadensis (FOSSIL) (Walcott, 1884 †)
Mourlonia nigra (FOSSIL) E.F.R.K. Koken, 1889 †
Euconospira nipponica (FOSSIL) I. Hayasaka, 1954 †
Conotoma nitella (FOSSIL) (J.W. Hall, 1860 †)
Cataschisma nitida (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Callistadia nittida (FOSSIL) (J. Wanner, 1922 †)
Buechelia nodifera (FOSSIL) Heidelberger & Koch,2005 †
Ananias nodocostatus (FOSSIL) Hoare, 1961 †
Lunulazona nodomarginata (FOSSIL) (McChesney, 1861 †)
Globodoma nodosa (FOSSIL) (Hoare & al., 1997 †)
Euconospira nodosa (FOSSIL) Cook & al., 2003 †
Genuspira nodosa (FOSSIL) Tyler, 1965 †
Apachella nodosa (FOSSIL) Batten, 1989 †
Buechelia nodosa (FOSSIL) Blodgett, 1992 †
Gosseletina nodosa (FOSSIL) Batten, 1966 †
Stenozone nodosuturala (FOSSIL) Batten, 1972 †
Angyomphalus northviewensis (FOSSIL) (R.M. Branson, 1938 †)
Apachella nucleola (FOSSIL) Wang, 1980 †
Pandospira nuda (FOSSIL) C.O. Waterhouse, 1963 †
Pseudobaylea nuda (FOSSIL) (J.B.M. Dana, 1847 †)
Neilsonia nuda (FOSSIL) Mazaev, 2015 †
Pragoloron nummularia (FOSSIL) (J. Perner, 1907 †)
Dictyotomaria nyi (FOSSIL) (Thein & Nitecki, 1974 †)
Gosseletina obesa (FOSSIL) Pan, 1977 †
Glabrocingulum obesum (FOSSIL) E.K. Yoo, 1988 †
Mourlonia obscura (FOSSIL) Dickins, 1963 †
Euconospira obsoleta (FOSSIL) Girty, 1909 †
Luciellina obsoleta (FOSSIL) Zhu, 1995 †
Prokopelia occludens (FOSSIL) (J. Perner, 1907 †)
Luciellina ocultabanda (FOSSIL) B.S. Kues & Batten,2001 †
Salterospira okawensis (FOSSIL) Thein & Nitecki, 1974 †
Eoplatyzona ongaroae (FOSSIL) Blodgett & al., 1999 †
Bicarina onoi (FOSSIL) T. Kase & Nishida, 1986 †
Ananias ootomaria (FOSSIL) Batten, 1989 †
Devonorhineoderma orbignyana (FOSSIL) (d'Archiac & de Verneuil,1842 †)