• Mactra Linnaeus, 1767
• Mactra (Allomactra) Tomlin, 1931 † accepted as Allomactra Tomlin, 1931 †
• Mactra (Avimactra) Andrusov, 1905 † accepted as Avimactra Andrusov, 1905 †
• Mactra (Avimactra) aviculoides Andrusov, 1905 † accepted as Avimactra aviculoides (Andrusov, 1905) †
• Mactra (Barymactra) Cossmann, 1909 accepted as Barymactra Cossmann, 1909
• Mactra (Chersonimactra) Paramonova, 1978 † accepted as Chersonimactra Paramonova, 1978 †
• Mactra (Chersonimactra) balcica Macarovici, 1935 † accepted as Chersonimactra balcica (Macarovici, 1935) †
• Mactra (Chersonimactra) bulgarica (Toula, 1892) † accepted as Chersonimactra bulgarica (Toula, 1892) †
• Mactra (Chersonimactra) caspia Eichwald, 1840 † accepted as Ionesimactra caspia (Eichwald, 1840) †
• Mactra (Chersonimactra) timida Zhizhchenko, 1934 † accepted as Chersonimactra timida (Zhizhchenko, 1934) †
• Mactra (Coelomactra) Dall, 1895 represented as Coelomactra Dall, 1895
• Mactra (Coelomactra) nasongoensis Ladd, 1934 † accepted as Coelomactra nasongoensis (Ladd, 1934) †
• Mactra (Cyclomactra) Dall, 1895 accepted as Cyclomactra Dall, 1895
• Mactra (Cyclomactra) williamsi Marwick, 1948 † accepted as Cyclomactra williamsi (Marwick, 1948) †
• Mactra (Eomactra) Cossmann, 1909 † represented as Mactra Linnaeus, 1767
• Mactra (Eomactra) bajarunasi V. P. Kolesnikov, 1925 † represented as Mactra bajarunasi V. P. Kolesnikov, 1925 †
• Mactra (Eomactra) basteroti (Mayer-Eymar, 1853) † represented as Mactra basteroti Mayer, 1853 †
• Mactra (Eomactra) basteroti basteroti Mayer, 1853 † represented as Mactra basteroti basteroti Mayer, 1853 †
• Mactra (Eomactra) basteroti konkensis Laskarev, 1899 † represented as Mactra basteroti konkensis Laskarev, 1899 †
• Mactra (Harvella) J. E. Gray, 1853 accepted as Harvella J. E. Gray, 1853
• Mactra (Harvella) sanctiblasii Maury, 1925 † accepted as Harvella elegans (G. B. Sowerby I, 1825)
• Mactra (Hemimactra) Swainson, 1840 accepted as Spisula J. E. Gray, 1837
• Mactra (Hemimactra) astensis Sacco, 1901 † (uncertain > unassessed)
• Mactra (Heteromactra) Cossmann, 1909 † accepted as Allomactra Tomlin, 1931 †
• Mactra (Heteromactra) E. Lamy, 1906 accepted as Cyamiomactra F. Bernard, 1897
• Mactra (Heteromactra) grateloupi Cossmann & Peyrot, 1909 † accepted as Allomactra grateloupi (Cossmann & Peyrot, 1909) †
• Mactra (Heteromactra) laminifera E. Lamy, 1906 accepted as Cyamiomactra laminifera (E. Lamy, 1906)
• Mactra (Kirghizella) Andrusov, 1902 † accepted as Kirghizella Andrusov, 1902 †
• Mactra (Kirghizella) pisum Andrusov, 1902 † accepted as Kirghizella pisum (Andrusov, 1902) †
• Mactra (Mactra) Linnaeus, 1767 represented as Mactra Linnaeus, 1767
• Mactra (Mactra) superstes Davitashvili, 1931 † represented as Mactra superstes Davitashvili, 1931 †
• Mactra (Mactra) westralis Lamprell & Whitehead, 1990 represented as Mactra westralis Lamprell & Whitehead, 1990
• Mactra (Mactra) williamsi S. S. Berry, 1960 accepted as Spisula adamsi Olsson, 1961
• Mactra (Mactrella) J. E. Gray, 1853 represented as Mactrella J. E. Gray, 1853
• Mactra (Mactrella) alata (Spengler, 1802) accepted as Mactrellona alata (Spengler, 1802)
• Mactra (Mactrinula) J. E. Gray, 1853 represented as Mactrinula J. E. Gray, 1853
• Mactra (Mactrinula) goniocyma Pilsbry & H. N. Lowe, 1932 accepted as Tumbeziconcha goniocyma (Pilsbry & H. N. Lowe, 1932)
• Mactra (Mactrinula) janeiroensis E. A. Smith, 1915 accepted as Mactrotoma janeiroensis (E. A. Smith, 1915)
• Mactra (Mactrodrerma) Dall, 1894 accepted as Mactrotoma Dall, 1894
• Mactra (Mactrotoma) Dall, 1894 accepted as Mactrotoma Dall, 1894
• Mactra (Mactrotoma) aspersa G. B. Sowerby I, 1825 accepted as Oxyperas aspersum (G. B. Sowerby I, 1825)
• Mactra (Mactrotoma) capensis G. B. Sowerby III, 1892 accepted as Simomactra capensis (G. B. Sowerby III, 1892)
• Mactra (Mactrotoma) iridia Olsson, 1932 † (uncertain > unassessed)
• Mactra (Mactrotoma) tholoensis Ladd, 1934 † accepted as Mactrotoma tholoensis (Ladd, 1934) †
• Mactra (Mactrotoma) undula Dall, 1898 † (uncertain > unassessed)
• Mactra (Mactrotoma) vitiensis (A. M. Davies, 1927) † accepted as Mactrotoma vitiensis (A. M. Davies, 1927) †
• Mactra (Mactrula) Marwick, 1948 accepted as Pseudocardium Gabb, 1866 †
• Mactra (Mactrula) mula Marwick, 1948 † accepted as Pseudocardium mula (Marwick, 1948) †
• Mactra (Maorimactra) H. J. Finlay, 1928 accepted as Maorimactra H. J. Finlay, 1928
• Mactra (Maorimactra) acuminella (H. J. Finlay, 1930) † accepted as Maorimactra acuminella H. J. Finlay, 1930 †
• Mactra (Maorimactra) bodmani Stilwell & Zinsmeister, 1992 † accepted as Maorimactra bodmani (Stilwell & Zinsmeister, 1992) † accepted as Mactra bodmani Stilwell & Zinsmeister, 1992 †
• Mactra (Maorimactra) carteri Beu, 2006 † represented as Mactra carteri Beu, 2006 †
• Mactra (Maorimactra) chrydaea (Suter, 1911) † represented as Mactra chrydaea Suter, 1911 † accepted as Maorimactra chrydaea (Suter, 1911) †
• Mactra (Maorimactra) marwicki Beu, 2006 † represented as Mactra marwicki Beu, 2006 †
• Mactra (Maorimactra) ordinaria E. A. Smith, 1898 accepted as Maorimactra ordinaria (E. A. Smith, 1898)
• Mactra (Micromactra) Dall, 1894 accepted as Mactrella J. E. Gray, 1853
• Mactra (Micromactra) atacama Pilsbry & Olsson, 1941 accepted as Mactrotoma angusta (Reeve, 1854)
• Mactra (Micromactra) isthmica Pilsbry & H. N. Lowe, 1932 accepted as Mactrotoma isthmica (Pilsbry & H. N. Lowe, 1932)
• Mactra (Micromactra) macescens Guppy, 1866 † (uncertain > unassessed)
• Mactra (Micromactra) surinamensis van Regteren Altena, 1968 accepted as Mactrotoma surinamensis (van Regteren Altena, 1968)
• Mactra (Micromactra) vanattae Pilsbry & H. N. Lowe, 1932 accepted as Mactrotoma isthmica (Pilsbry & H. N. Lowe, 1932)
• Mactra (Micromactra) vanattae acymata Pilsbry & H. N. Lowe, 1932 accepted as Mactrotoma isthmica (Pilsbry & H. N. Lowe, 1932)
• Mactra (Mulinia) J. E. Gray, 1837 accepted as Mulinia J. E. Gray, 1837
• Mactra (Mulinia) levicardo E. A. Smith, 1881 accepted as Mulinia levicardo (E. A. Smith, 1881)
• Mactra (Mulinia) rodatzi Dunker, 1850 accepted as Mulinia edulis (P. P. King, 1832)
• Mactra (Nannomactra) Iredale, 1930 represented as Mactra Linnaeus, 1767
• Mactra (Nannomactra) jacksonensis E. A. Smith, 1885 represented as Mactra jacksonensis E. A. Smith, 1885
• Mactra (Nannomactra) pusilla A. Adams, 1856 accepted as Mactra pusilla A. Adams, 1856
• Mactra (Oxyperas) Mörch, 1853 accepted as Oxyperas Mörch, 1853
• Mactra (Oxyperas) coppingeri E. A. Smith, 1884 accepted as Oxyperas coppingeri (E. A. Smith, 1884)
• Mactra (Pseudoxyperas) Sacco, 1901 accepted as Oxyperas Mörch, 1853
• Mactra (Pseudoxyperas) proaspersa Sacco, 1901 accepted as Oxyperas proaspersum (Sacco, 1901)
• Mactra (Pseudoxyperas) proaspersa var. perelliptica Sacco, 1901 † (uncertain > unassessed)
• Mactra (Pseudoxyperas) proaspersa var. plioastensis Sacco, 1901 † (uncertain > unassessed)
• Mactra (Pseudoxyperas) proaspersa var. taurelliptica Sacco, 1901 † (uncertain > unassessed)
• Mactra (Pseudoxyperas) proaspersa var. taurolaevis Sacco, 1901 † (uncertain > unassessed)
• Mactra (Sarmatimactra) Korobkov, 1954 † accepted as Sarmatimactra Korobkov, 1954 †
• Mactra (Sarmatimactra) andrussowi V. Kolesnikov, 1925 † accepted as Sarmatimactra andrussowi (V. Kolesnikov, 1925) †
• Mactra (Sarmatimactra) balcica Macarovici, 1935 † accepted as Chersonimactra balcica (Macarovici, 1935) †
• Mactra (Sarmatimactra) bulgarica Toula, 1892 † accepted as Chersonimactra bulgarica (Toula, 1892) †
• Mactra (Sarmatimactra) caspia Eichwald, 1840 † accepted as Ionesimactra caspia (Eichwald, 1840) †
• Mactra (Sarmatimactra) eichwaldi Laskarev, 1914 † accepted as Podolimactra eichwaldi (Laskarew, 1914) †
• Mactra (Sarmatimactra) eichwaldi crassa Sidorova, 1959 † accepted as Podolimactra eichwaldi crassa (Sidorova, 1959) †
• Mactra (Sarmatimactra) fabreana A. d'Orbigny, 1845 † accepted as Sarmatimactra fabreana (A. d'Orbigny, 1845) †
• Mactra (Sarmatimactra) georgei (Baily, 1858) † accepted as Sarmatimactra georgei (Baily, 1858) †
• Mactra (Sarmatimactra) pallasi (Baily, 1858) † accepted as Sarmatimactra vitaliana pallasi (Baily, 1858) †
• Mactra (Sarmatimactra) podolica Eichwald, 1830 † accepted as Sarmatimactra podolica (Eichwald, 1830) †
• Mactra (Sarmatimactra) tapesoides Sinzov, 1897 † accepted as Sarmatimactra tapesoides (Sinzov, 1897) †
• Mactra (Sarmatimactra) timida Zhizhchenko, 1934 † accepted as Chersonimactra timida (Zhizhchenko, 1934) †
• Mactra (Sarmatimactra) vitaliana A. d'Orbigny, 1845 † accepted as Sarmatimactra vitaliana (A. d'Orbigny, 1845) †
• Mactra (Sarmatimactra) vitaliana balcica Macarovici, 1935 † accepted as Chersonimactra balcica (Macarovici, 1935) †
• Mactra (Sarmatimactra) vitaliana fabreana (A. d'Orbigny, 1845) † accepted as Sarmatimactra fabreana (A. d'Orbigny, 1845) †
• Mactra (Sarmatimactra) vitaliana pallasi (Baily, 1858) † accepted as Sarmatimactra vitaliana pallasi (Baily, 1858) †
• Mactra (Sarmatimactra) vitaliana turkmena Nevesskaja, 1955 † accepted as Sarmatimactra vitaliana turkmena (Nevesskaja, 1955) †
• Mactra (Sarmatimactra) vitaliana vitaliana (A. d'Orbigny, 1845) † accepted as Sarmatimactra vitaliana vitaliana (A. d'Orbigny, 1845) †
• Mactra (Simomactra) Dall, 1894 accepted as Simomactra Dall, 1894
• Mactra (Simomactra) hoffstetteri Cauquoin, 1969 accepted as Spisula adamsi Olsson, 1961
• Mactra (Spisula) J. E. Gray, 1837 accepted as Spisula J. E. Gray, 1837
• Mactra (Spisula) asperaeformis Nomura & Zinbo, 1934 † accepted as Oxyperas (Rugosoxyperas) asperaeformis (Nomura & Zinbo, 1934) †
• Mactra (Spisula) grayana Schrenck, 1867 accepted as Mactromeris polynyma (W. Stimpson, 1860)