1. Species Fossarus ambiguus (Linnaeus, 1758)
2. Species Fossarus adansoni R. A. Philippi, 1841 accepted as Fossarus ambiguus (Linnaeus, 1758)
3. Species Fossarus aptus Melvill, 1912 accepted as Fossarus ambiguus (Linnaeus, 1758)
4. Species Fossarus clathratus R. A. Philippi, 1844 accepted as Carinorbis clathrata (R. A. Philippi, 1844) (unaccepted > superseded combination)
5. Species Fossarus depressus G. Seguenza, 1876 accepted as Megalomphalus disciformis (Granata Grillo, 1877) accepted as Megalomphalus azoneus (Brusina, 1865) (unaccepted > junior homonym, invalid: secondary junior homonym of Adeorbis depressus A. Adams, 1861; Adeorbis seguenzianus is a replacement name)
6. Species Fossarus disciformis Granata Grillo, 1877 accepted as Megalomphalus azoneus (Brusina, 1865) (unaccepted > junior subjective synonym, probable synonym)
7. Species Fossarus eutorniscus Melvill, 1918 accepted as Conradia eutornisca (Melvill, 1918) (unaccepted > superseded combination)
8. Species Fossarus excavatus Gaglini, 1987 accepted as Rugulina monterosatoi (van Aartsen & Bogi, 1987) (synonym)
9. Species Fossarus granulum Brugnone, 1873 accepted as Pseudorbis granulum (Brugnone, 1873) (original combination)
10. Species Fossarus lanoei Baudon, 1858 accepted as Fossarus ambiguus (Linnaeus, 1758) (synonym)
11. Species Fossarus petitianus Tiberi, 1868 accepted as Megalomphalus petitianus (Tiberi, 1868) (original combination)

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