Omalaxis amoena Murdoch & Suter, 1906 accepted as Pseudotorinia amoena (Murdoch & Suter, 1906)
Omalaxis bifrons (Lamarck, 1804) †
Omalaxis brusseliensis Glibert, 1985 †
Omalaxis conoideus (Cossmann, 1882) †
Omalaxis deshayesii (Potiez & Michaud, 1838) †
Omalaxis disjunctus (Lamarck, 1804) †
Omalaxis exquisita Dall & C. T. Simpson, 1901 accepted as Omalaxis exquisitus Dall & C. T. Simpson, 1901 accepted as Spirolaxis centrifuga (Monterosato, 1890)
Omalaxis exquisitus Dall & C. T. Simpson, 1901 accepted as Spirolaxis centrifuga (Monterosato, 1890)
Omalaxis funiculus (Dall, 1892) accepted as Vitrinella funiculus (Dall, 1892)
Omalaxis funiculus contracta Vanatta, 1913 accepted as Vitrinella contracta (Vanatta, 1913)
Omalaxis helicoides (Cossmann & Pissarro, 1902) †
Omalaxis laudunensis (Defrance, 1828) †
Omalaxis lirata A. E. Verrill, 1882 accepted as Circulus liratus (A. E. Verrill, 1882)
Omalaxis meridionalis Hedley, 1903 accepted as Pseudomalaxis zanclaeus meridionalis (Hedley, 1903)
Omalaxis nobilis A. E. Verrill, 1885 accepted as Pseudomalaxis zanclaeus (R. A. Philippi, 1844)
Omalaxis planus P. Marshall, 1917 † accepted as Wangaloa plana (P. Marshall, 1917) †
Omalaxis radiata Hedley, 1907 accepted as Lissotesta radiata (Hedley, 1907)
Omalaxis sarsi K. J. Bush, 1897 accepted as Orbitestella sarsi (K. J. Bush, 1897)
Omalaxis serratus (Deshayes, 1832) †
Omalaxis singleyi Aldrich, 1890 † (uncertain )
Omalaxis spiratus (de Raincourt, 1876) †
Omalaxis supranitida (S. V. Wood, 1848) sensu G. O. Sars, 1878 accepted as Orbitestella sarsi (K. J. Bush, 1897)