Straparollus acuminatus (FOSSIL) Frýda, 1998 †
Euomphalus acuticosta (FOSSIL) C.L.F. von Sandberger& C.L.F. von Sandberger, 1855 †
Euomphalus acutus (FOSSIL) Sowerby, 1818 †
Straparollus aequalis (FOSSIL) Sowerby, 1815 †
Philoxene alacer (FOSSIL) J. Perner, 1903 †
Euomphalus alaskensis (FOSSIL) E.L. Yochelson & Dutro,1960 †
Mastigospira alata (FOSSIL) (J.J.F. Whiteaves,1892 †)
Poleumita alata (FOSSIL) (Lindström, 1884 †)
Euomphalopterus alatus (FOSSIL) (Wahlenberg, 1821 †)
Euomphalopterus aliger (FOSSIL) J. Perner, 1903 †
Straparollus ammon (FOSSIL) White & R.P. Whitfield,1862 †
Straparollus ammonitiformis (FOSSIL) R. Etheridge jr., 1902 †
Poleumita anabarica (FOSSIL) Kurushin, 1986 †
Euomphalus angularis (FOSSIL) Weller, 1900 †
Straparollus annulatus (FOSSIL) J.J.F. Whiteaves, 1892 †
Euomphalus anticostiensis (FOSSIL) Twenhofel, 1928 †
Euomphalopterus apedalensis (FOSSIL) Pitcher, 1939 †
Euomphalus araneifer (FOSSIL) Whidborne, 1892 †
Euomphalus archiaci (FOSSIL) G.A. Goldfuss, 1844 †
Leptomphalus arcturus (FOSSIL) Yancey, 1969 †
Philoxene argutus (FOSSIL) Fenton & Fenton, 1924 †
Euomphalus articulatus (FOSSIL) G.A. Goldfuss, 1844 †
Euomphalus asanoi (FOSSIL) T. Kase, 1988 †
Hystricoceras astraciformis (FOSSIL) (Lindström, 1884 †)
Hystricoceras astraliformis (FOSSIL) (Lindström, 1884 †)
Straparollus ater (FOSSIL) Spitz, 1907 †
Pentagonodiscus augustus (FOSSIL) Wendt, 1968 †
Straparollus australis (FOSSIL) P.A. Maxwell, 1961 †
Euomphalus basinodosus (FOSSIL) Kirchner, 1915 †
Leptomphalus besselensis (FOSSIL) Dickins, 1963 †
Euomphalus biarmatus (FOSSIL) Klipstein, 1843 †
Straparollus bicavatus (FOSSIL) Spriestersbach, 1942 †
Spinicharybdis billingsi (FOSSIL) Rohr & A. Packard, 1982 †
Woehrmannia boehmi (FOSSIL) E.A.L. Kittl, 1899 †
Straparollus bohemicus (FOSSIL) Barrande in J. Perner,1907 †