Morania wagneri (FOSSIL) Rohr & al., 2008 †
Murchisonia wandovalensis (FOSSIL) Cook & Camilleri, 1997 †
Devonocerithioides whidborni (FOSSIL) (Frýda, 2000 †)
Michelia whiteavesi (FOSSIL) (A.H. Clarke & Ruedemann,1903 †)
Hormotoma wilsoni (FOSSIL) Okulitch, 1935 †
Hormotoma winnipegensis (FOSSIL) J.J.F. Whiteaves, 1897 †
Crenulazona wuxuanensis (FOSSIL) Cook & Pan, 2004 †
Murchisonia xanthippe (FOSSIL) Billings, 1865 †
Akasakiella yabei (FOSSIL) (I. Hayasaka, 1943 †)
Micrentoma yunnanensis (FOSSIL) (Mansuy, 1919 †)
Diplozone zeuneri (FOSSIL) (F.A. Roemer, 1852 †)
Murchisonia zimmermanni (FOSSIL) Heidelberger & Koch,2005 †
Coelocaulus zonaria (FOSSIL) J. Perner, 1907 †
Glyphodeta zonata (FOSSIL) (J. Donald, 1887 †)
Chambersius zonatus (FOSSIL) Lamont, 1978 †
Loxisonia zygopleuroides (FOSSIL) Batten, 1985 †