- Prostoma helgolandicum accepted as Prostomum helgolandicus Mecznikow, 1865 accepted as Phonorhynchus helgolandicus (Mecznikow, 1865) Graff, 1905
- Prostoma kefersteinii Claparède, 1863 accepted as Polycystis naegelii Kölliker, 1845
- Prostoma lineare Örsted, 1843 accepted as Gyratrix hermaphroditus Ehrenberg, 1831
- Prostoma lineare Schmidt, 1848 accepted as Prostoma lineare Örsted, 1843 accepted as Gyratrix hermaphroditus Ehrenberg, 1831
- Prostoma littorale Oersted, 1843 accepted as Macrorhynchus croceus (Fabricius, 1826) Graff, 1882 accepted as Graffiellus croceus (Fabricius, 1826) Hornung, 2016
- Prostoma putelale Beauchamp, 1932