1. Species Mactra abbreviata Lamarck, 1818
2. Species Mactra achatina Holten, 1802
3. Species Mactra aequisulcata G. B. Sowerby III, 1894
4. Species Mactra alta Deshayes, 1855
5. Species Mactra antiquata Spengler, 1802
6. Species Mactra aphrodina Reeve, 1854
7. Species Mactra artensis Montrouzier, 1859
8. Species Mactra asiatica Tolstikova, 1964 †
9. Species Mactra australis Lamarck, 1818
10. Species Mactra axiniformis Tate, 1887 †
11. Species Mactra bajarunasi V. P. Kolesnikov, 1925 †
12. Species Mactra basteroti Mayer, 1853 †
13. Species Mactra bodmani Stilwell & Zinsmeister, 1992 †
14. Species Mactra carteri Beu, 2006 †
15. Species Mactra chinensis R. A. Philippi, 1846
16. Species Mactra corallina (Linnaeus, 1758)
17. Species Mactra cordiformis Reeve, 1854
18. Species Mactra crossei (Dunker, 1877)
19. Species Mactra cumingii Reeve, 1854
20. Species Mactra cuneata Gmelin, 1791
21. Species Mactra cygnus Gmelin, 1791
22. Species Mactra darwinii G. B. Sowerby I, 1846 †
23. Species Mactra deshayesi Mayer, 1867
24. Species Mactra dissimilis Reeve, 1854
25. Species Mactra dubia d'Archiac, 1854 †
26. Species Mactra eburnea R. A. Philippi, 1849
27. Species Mactra eximia Reeve, 1854
28. Species Mactra faugeresi Gillet, 1971 †
29. Species Mactra fuegiensis E. A. Smith, 1905
30. Species Mactra gigas Nowell-Usticke, 1969
31. Species Mactra glabrata Linnaeus, 1767
32. Species Mactra glauca Born, 1778
33. Species Mactra grandis Gmelin, 1791
34. Species Mactra guidoi Signorelli & F. Scarabino, 2010
35. Species Mactra hamiltonensis Tate, 1887 †
36. Species Mactra holmesi (Meek, 1875) †
37. Species Mactra inaequalis Reeve, 1854
38. Species Mactra incarnata Reeve, 1854
39. Species Mactra incerta E. A. Smith, 1885
40. Species Mactra iridescens Kuroda & Habe, 1958
41. Species Mactra irigari Wilckens, 1910 †
42. Species Mactra irizari Wilckens, 1910 †
43. Species Mactra isabelleana A. d'Orbigny, 1846
44. Species Mactra jacksonensis E. A. Smith, 1885
45. Species Mactra kaffraria Rennie, 1930 †
46. Species Mactra kanakina S. M. Souverbie, 1860
47. Species Mactra lilacea Lamarck, 1818
48. Species Mactra luzonica Reeve, 1854
49. Species Mactra maculata Gmelin, 1791
50. Species Mactra marplatensis Doello-Jurado, 1949
51. Species Mactra marwicki Beu, 2006 †
52. Species Mactra mitis Reeve, 1854
53. Species Mactra nipponica Kuroda & Habe, 1971
54. Species Mactra olorina R. A. Philippi, 1846
55. Species Mactra opposita Reeve, 1854
56. Species Mactra patagonica A. d'Orbigny, 1846 †
57. Species Mactra petitii A. d'Orbigny, 1846
58. Species Mactra plana K. Martin, 1879 †
59. Species Mactra plistoneerlandica van Regteren Altena, 1937 †
60. Species Mactra pulchella R. A. Philippi, 1846
61. Species Mactra pura Reeve, 1854
62. Species Mactra pusilla A. Adams, 1856
63. Species Mactra quadrangularis Reeve, 1854
64. Species Mactra queenslandica E. A. Smith, 1914
65. Species Mactra quirosana H. K. Hodson, 1931
66. Species Mactra rochebrunei E. Lamy, 1916
67. Species Mactra sauliana Gray, 1838
68. Species Mactra sericea Reeve, 1854
69. Species Mactra stultorum (Linnaeus, 1758)
70. Species Mactra subglobosa Broderip & G. B. Sowerby I, 1829
71. Species Mactra subponderosa A. d'Orbigny, 1852 †
72. Species Mactra superstes Davitashvili, 1931 †
73. Species Mactra thaanumi Dall, Bartsch & Rehder, 1938
74. Species Mactra turgida Gmelin, 1791
75. Species Mactra turkmenica Tolstikova, 1964 †
76. Species Mactra violacea Gmelin, 1791
77. Species Mactra westralis Lamprell & Whitehead, 1990
78. Subgenus Mactra (Allomactra) Tomlin, 1931 † accepted as Allomactra Tomlin, 1931 † (unaccepted > superseded rank)
79. Subgenus Mactra (Avimactra) Andrusov, 1905 † accepted as Avimactra Andrusov, 1905 †
    1. Species Mactra (Avimactra) aviculoides Andrusov, 1905 † accepted as Avimactra aviculoides (Andrusov, 1905) †
80. Subgenus Mactra (Barymactra) Cossmann, 1909 accepted as Barymactra Cossmann, 1909 (unaccepted > superseded rank)
81. Subgenus Mactra (Cyclomactra) Dall, 1895 accepted as Cyclomactra Dall, 1895 (original rank)
    1. Species Mactra (Cyclomactra) williamsi Marwick, 1948 † accepted as Cyclomactra williamsi (Marwick, 1948) † (superseded combination)
82. Subgenus Mactra (Harvella) J. E. Gray, 1853 accepted as Harvella J. E. Gray, 1853 (unaccepted > superseded rank)
    1. Species Mactra (Harvella) sanctiblasii Maury, 1925 † accepted as Harvella elegans (G. B. Sowerby I, 1825) (unaccepted > junior subjective synonym)
83. Subgenus Mactra (Heteromactra) E. Lamy, 1906 accepted as Cyamiomactra F. Bernard, 1897 (unaccepted > junior subjective synonym)
    1. Species Mactra (Heteromactra) laminifera E. Lamy, 1906 accepted as Cyamiomactra laminifera (E. Lamy, 1906) (basionym)
84. Subgenus Mactra (Heteromactra) Cossmann, 1909 † accepted as Allomactra Tomlin, 1931 † (unaccepted > junior homonym, Invalid: junior homonym of Heteromactra Lamy, 1906)
    1. Species Mactra (Heteromactra) grateloupi Cossmann & Peyrot, 1909 † accepted as Allomactra grateloupi (Cossmann & Peyrot, 1909) † (unaccepted > superseded combination)
85. Subgenus Mactra (Kirghizella) Andrusov, 1902 † accepted as Kirghizella Andrusov, 1902 †
    1. Species Mactra (Kirghizella) pisum Andrusov, 1902 † accepted as Kirghizella pisum (Andrusov, 1902) †
86. Subgenus Mactra (Mactrodrerma) Dall, 1894 accepted as Mactrotoma Dall, 1894
87. Subgenus Mactra (Mactrotoma) Dall, 1894 accepted as Mactrotoma Dall, 1894 (unaccepted > superseded rank)
    1. Species Mactra (Mactrotoma) aspersa G. B. Sowerby I, 1825 accepted as Oxyperas aspersum (G. B. Sowerby I, 1825)
    2. Species Mactra (Mactrotoma) capensis G. B. Sowerby III, 1892 accepted as Simomactra capensis (G. B. Sowerby III, 1892)
    3. Species Mactra (Mactrotoma) tholoensis Ladd, 1934 † accepted as Mactrotoma tholoensis (Ladd, 1934) †
    4. Species Mactra (Mactrotoma) vitiensis (A. M. Davies, 1927) † accepted as Mactrotoma vitiensis (A. M. Davies, 1927) †
    5. Species Mactra (Mactrotoma) undula Dall, 1898 † (uncertain > unassessed)
88. Subgenus Mactra (Mactrula) Marwick, 1948 accepted as Pseudocardium Gabb, 1866 †
    1. Species Mactra (Mactrula) mula Marwick, 1948 † accepted as Pseudocardium mula (Marwick, 1948) † (superseded combination)
89. Subgenus Mactra (Maorimactra) H. J. Finlay, 1928 accepted as Maorimactra H. J. Finlay, 1928 (unaccepted > superseded combination)
    1. Species Mactra (Maorimactra) acuminella (H. J. Finlay, 1930) † accepted as Maorimactra acuminella H. J. Finlay, 1930 † (superseded combination)
    2. Species Mactra (Maorimactra) bodmani Stilwell & Zinsmeister, 1992 † accepted as Maorimactra bodmani (Stilwell & Zinsmeister, 1992) † accepted as Mactra bodmani Stilwell & Zinsmeister, 1992 †
    3. Species Mactra (Maorimactra) ordinaria E. A. Smith, 1898 accepted as Maorimactra ordinaria (E. A. Smith, 1898) (superseded combination)
    4. Species Mactra (Maorimactra) carteri Beu, 2006 † represented as Mactra carteri Beu, 2006 †
    5. Species Mactra (Maorimactra) chrydaea (Suter, 1911) † represented as Mactra chrydaea Suter, 1911 † accepted as Maorimactra chrydaea (Suter, 1911) †
    6. Species Mactra (Maorimactra) marwicki Beu, 2006 † represented as Mactra marwicki Beu, 2006 †
90. Subgenus Mactra (Micromactra) Dall, 1894 accepted as Mactrella J. E. Gray, 1853 (unaccepted > junior subjective synonym)
    1. Species Mactra (Micromactra) atacama Pilsbry & Olsson, 1941 accepted as Mactrotoma angusta (Reeve, 1854)
    2. Species Mactra (Micromactra) surinamensis van Regteren Altena, 1968 accepted as Mactrotoma surinamensis (van Regteren Altena, 1968)
    3. Species Mactra (Micromactra) vanattae Pilsbry & H. N. Lowe, 1932 accepted as Mactrotoma isthmica (Pilsbry & H. N. Lowe, 1932) (unaccepted > junior subjective synonym)
    4. Species Mactra (Micromactra) macescens Guppy, 1866 † (uncertain > unassessed)
91. Subgenus Mactra (Mulinia) J. E. Gray, 1837 accepted as Mulinia J. E. Gray, 1837 (unaccepted > superseded rank)
    1. Species Mactra (Mulinia) levicardo E. A. Smith, 1881 accepted as Mulinia levicardo (E. A. Smith, 1881) (basionym)
    2. Species Mactra (Mulinia) rodatzi Dunker, 1850 accepted as Mulinia edulis (P. P. King, 1832)
92. Subgenus Mactra (Oxyperas) Mörch, 1853 accepted as Oxyperas Mörch, 1853
    1. Species Mactra (Oxyperas) coppingeri E. A. Smith, 1884 accepted as Oxyperas coppingeri (E. A. Smith, 1884) (basionym)
93. Subgenus Mactra (Pseudoxyperas) Sacco, 1901 accepted as Oxyperas Mörch, 1853 (superseded combination)
    1. Species Mactra (Pseudoxyperas) proaspersa Sacco, 1901 accepted as Oxyperas proaspersum (Sacco, 1901)
94. Subgenus Mactra (Sarmatimactra) Korobkov, 1954 † accepted as Sarmatimactra Korobkov, 1954 † (unaccepted > superseded rank)
    1. Species Mactra (Sarmatimactra) andrussowi V. Kolesnikov, 1925 † accepted as Sarmatimactra andrussowi (V. Kolesnikov, 1925) †
    2. Species Mactra (Sarmatimactra) bulgarica Toula, 1892 † accepted as Chersonimactra bulgarica (Toula, 1892) †
    3. Species Mactra (Sarmatimactra) caspia Eichwald, 1840 † accepted as Ionesimactra caspia (Eichwald, 1840) †
    4. Species Mactra (Sarmatimactra) eichwaldi Laskarev, 1914 † accepted as Podolimactra eichwaldi (Laskarew, 1914) †
    5. Species Mactra (Sarmatimactra) fabreana A. d'Orbigny, 1844 † accepted as Sarmatimactra fabreana (A. d'Orbigny, 1844) †
    6. Species Mactra (Sarmatimactra) pallasi (Baily, 1858) † accepted as Sarmatimactra vitaliana pallasi (Baily, 1858) †
    7. Species Mactra (Sarmatimactra) tapesoides Sinzov, 1897 † accepted as Sarmatimactra tapesoides (Sinzov, 1897) †
    8. Species Mactra (Sarmatimactra) vitaliana A. d'Orbigny, 1844 † accepted as Sarmatimactra vitaliana (A. d'Orbigny, 1844) †
95. Subgenus Mactra (Simomactra) Dall, 1894 accepted as Simomactra Dall, 1894
    1. Species Mactra (Simomactra) hoffstetteri Cauquoin, 1969 accepted as Spisula adamsi Olsson, 1961
96. Subgenus Mactra (Spisula) J. E. Gray, 1837 accepted as Spisula J. E. Gray, 1837
    1. Species Mactra (Spisula) asperaeformis Nomura & Zinbo, 1934 † accepted as Oxyperas (Rugosoxyperas) asperaeformis (Nomura & Zinbo, 1934) † (unaccepted > superseded combination)
    2. Species Mactra (Spisula) grayana Schrenck, 1867 accepted as Mactromeris polynyma (W. Stimpson, 1860)
97. Subgenus Mactra (Trigonella) Conrad, 1837 accepted as Tivela Link, 1807
    1. Species Mactra (Trigonella) incerta E. A. Smith, 1885 accepted as Mactra incerta E. A. Smith, 1885 (basionym)
    2. Species Mactra (Trigonella) jacksonensis E. A. Smith, 1885 accepted as Mactra jacksonensis E. A. Smith, 1885 (basionym)
    3. Species Mactra (Trigonella) laevis Dunker, 1871 accepted as Mactra lilacea Lamarck, 1818 (junior synonym)
    4. Species Mactra (Trigonella) radiata Dunker, 1871 (uncertain > taxon inquirendum, not of Mendes da Costa, 1778; not of Spengler, 1802; not of Donovan, 1803)
98. Species Mactra acuminella (Finlay, 1930) † accepted as Maorimactra acuminella H. J. Finlay, 1930 †
99. Species Mactra acutecarinata Andrusov, 1902 † accepted as Andrussella acutecarinata (Andrusov, 1902) †
100. Species Mactra acutissima Cosel, 1995 accepted as Scissodesma acutissima (Cosel, 1995)
101. Species Mactra adansoni [sic] accepted as Mactra adansonii R. A. Philippi, 1849 accepted as Mactra glabrata Linnaeus, 1767 (misspelling of specific epithet)
102. Species Mactra adansonii R. A. Philippi, 1849 accepted as Mactra glabrata Linnaeus, 1767
103. Species Mactra adspersa Dunker, 1849 accepted as Mactra achatina Holten, 1802
104. Species Mactra aegyptiaca Dillwyn, 1817 accepted as Meropesta nicobarica (Gmelin, 1791)
105. Species Mactra aequilatera Reeve, 1854 accepted as Crassula aequilatera (Reeve, 1854) (superseded combination)
106. Species Mactra aequilateralis Deshayes, 1854 accepted as Crassula aequilatera (Reeve, 1854) (junior objective synonym)
107. Species Mactra agalarovae A. A. Ali-Zade, 1967 † accepted as Aktschagylia eldarica (V. P. Kolesnikov, 1950) † (junior subjective synonym)
108. Species Mactra alata A. A. Ali-Zade & O. I. Popova, 1967 † accepted as Avimactra praeaviculoides Cheltsov, 1967 † (tentative junior subjective synonym)
109. Species Mactra alata Spengler, 1802 accepted as Mactrellona alata (Spengler, 1802) (unaccepted > superseded combination)
110. Species Mactra alata Macarovici, 1940 † accepted as Planimactra plana (Belokrys, 1964) † (unaccepted > junior homonym)
111. Species Mactra alba W. Wood, 1802 accepted as Abra alba (W. Wood, 1802)
112. Species Mactra alba Lamarck, 1818 accepted as Mactra corallina (Linnaeus, 1758)
113. Species Mactra albana A. A. Ali-Zade & O. I. Popova, 1967 † accepted as Aktschagylia nazarlebi (K. A. Ali-Zade, 1932) † (junior subjective synonym)
114. Species Mactra albina Deshayes, 1832 accepted as Leptospisula nivea (Gmelin, 1791)
115. Species Mactra alfredensis Bartsch, 1915 accepted as Mactrotoma ovalina (Lamarck, 1818) (junior synonym)
116. Species Mactra ambiqua Weinkauff, 1884 accepted as Mactrotoma compressa (Spengler, 1802)
117. Species Mactra amygdala Crosse & P. Fischer, 1864 accepted as Anapella cycladea (Lamarck, 1818)
118. Species Mactra anatina Spengler, 1802 accepted as Anatina anatina (Spengler, 1802) (original combination)
119. Species Mactra anatinoides Reeve, 1854 accepted as Raeta pellicula (Reeve, 1854)
120. Species Mactra andamanica (E. A. Smith, 1904) accepted as Periploma andamanicum (E. A. Smith, 1904)
121. Species Mactra andrussowi V. Kolesnikov, 1925 † accepted as Sarmatimactra andrussowi (V. Kolesnikov, 1925) † (unaccepted > superseded combination)
122. Species Mactra angolensis Cosel, 1995 accepted as Scissodesma angolensis (Cosel, 1995)
123. Species Mactra angulata Reeve, 1854 accepted as Mulinia pallida (Broderip & G. B. Sowerby I, 1829) (unaccepted > junior homonym, not Mactra angulata J. de C. Sowerby, 1836)
124. Species Mactra angulifera Reeve, 1854 accepted as Mactrotoma angulifera (Reeve, 1854) (original combination)
125. Species Mactra angulifera Deshayes, 1855 accepted as Mactra angulifera Reeve, 1854 accepted as Mactrotoma angulifera (Reeve, 1854) (synonym and homonym)
126. Species Mactra angusta Reeve, 1854 accepted as Mactrotoma angusta (Reeve, 1854) (original combination)
127. Species Mactra angusta Deshayes, 1855 accepted as Mactra angusta Reeve, 1854 accepted as Mactrotoma angusta (Reeve, 1854) (synonym and homonym)
128. Species Mactra anserina Guppy, 1874 accepted as Mactrotoma fragilis (Gmelin, 1791)
129. Species Mactra aphrodina Deshayes, 1855 accepted as Mactra aphrodina Reeve, 1854 (synonym and homonym)
130. Species Mactra apicina Reeve, 1854 accepted as Mactra luzonica Reeve, 1854
131. Species Mactra approba A. A. Ali-Zade, 1967 † accepted as Aktschagylia karabugasica (Andrusov, 1902) † (tentative junior subjective synonym)
132. Species Mactra araucana A. d'Orbigny, 1847 † accepted as Mactra ambigua R. A. Philippi, 1887 † (unaccepted > junior homonym)
133. Species Mactra arctata Conrad, 1831 accepted as Mesodesma arctatum (Conrad, 1831)
134. Species Mactra ashburnerii Gabb, 1864 † accepted as Cymbophora ashburnerii (Gabb, 1864) † (unaccepted > superseded combination)
135. Species Mactra aspersa G. B. Sowerby I, 1825 accepted as Oxyperas aspersa (G. B. Sowerby I, 1825) accepted as Oxyperas aspersum (G. B. Sowerby I, 1825)
136. Species Mactra asteriae A. A. Ali-Zade, 1967 † accepted as Aktschagylia ossoskovi (Andrusov, 1902) † (tentative junior subjective synonym)
137. Species Mactra atacama Pilsbry & Olsson, 1941 accepted as Mactrotoma angusta (Reeve, 1854)
138. Species Mactra attenuata Reeve, 1854 accepted as Mactra cygnus Gmelin, 1791
139. Species Mactra attenuata Deshayes, 1855 accepted as Mactra attenuata Reeve, 1854 accepted as Mactra cygnus Gmelin, 1791 (synonym and homonym)
140. Species Mactra attenuata F. W. Hutton, 1873 † accepted as Oxyperas leda (H. J. Finlay, 1924) † (invalid: not Reeve, 1854, nor Deshayes, 1855)
141. Species Mactra austeniana Maury, 1912 † accepted as Tivela austeniana (Maury, 1912) † (unaccepted > superseded combination)
142. Species Mactra azerbajdjanica A. A. Ali-Zade & Kabakova, 1967 † accepted as Aktschagylia azerbajdjanica (A. A. Ali-Zade & Kabakova, 1967) †
143. Species Mactra balchanica A. A. Ali-Zade, 1967 † accepted as Aktschagylia subcaspia (Andrusov, 1902) † (tentative junior subjective synonym)
144. Species Mactra bernayi Cossmann, 1886 † accepted as Spisula bernayi (Cossmann, 1886) † (unaccepted > superseded combination)
145. Species Mactra bilineata Reeve, 1854 accepted as Mactrotoma fragilis (Gmelin, 1791)
146. Species Mactra bilineata Deshayes, 1855 accepted as Mactra bilineata Reeve, 1854 accepted as Mactrotoma fragilis (Gmelin, 1791) (synonym and homonym)
147. Species Mactra bistrigata Mörch, 1860 accepted as Mulinia pallida (Broderip & G. B. Sowerby I, 1829)
148. Species Mactra bogatschevi A. A. Ali-Zade, 1967 † accepted as Kirghizella modiolopsis (Cheltsov, 1967) † (tentative junior subjective synonym)
149. Species Mactra bonneauii Bernardi, 1858 accepted as Mactra quadrangularis Reeve, 1854
150. Species Mactra bourguignati Locard, 1890 accepted as Mactra stultorum (Linnaeus, 1758)
151. Species Mactra boysii Montagu, 1803 accepted as Abra alba (W. Wood, 1802)
152. Species Mactra brasiliana Lamarck, 1818 accepted as Mactrotoma fragilis (Gmelin, 1791)
153. Species Mactra bulgarica Toula, 1892 † accepted as Chersonimactra bulgarica (Toula, 1892) †
154. Species Mactra burdigalensis Mayer, 1864 † accepted as Barymactra burdigalensis (Mayer, 1864) †
155. Species Mactra calbucana R. A. Philippi, 1893 accepted as Mulinia exalbida J. E. Gray, 1837
156. Species Mactra californica Reeve, 1854 accepted as Mactrotoma nasuta (A. Gould, 1851)
157. Species Mactra californica Conrad, 1837 accepted as Mactrella californica (Conrad, 1837) accepted as Mactrotoma californica (Conrad, 1837) (original combination)
158. Species Mactra californica Deshayes, 1855 accepted as Mactra californica Reeve, 1854 accepted as Mactrotoma nasuta (A. Gould, 1851) (synonym and homonym)
159. Species Mactra campechensis J. E. Gray, 1825 accepted as Raeta plicatella (Lamarck, 1818) (unaccepted > junior subjective synonym)
160. Species Mactra candida Nardo, 1847 accepted as Mactra corallina (Linnaeus, 1758)
161. Species Mactra capensis G. B. Sowerby III, 1892 accepted as Simomactra capensis (G. B. Sowerby III, 1892)
162. Species Mactra capillacea Reeve, 1854 accepted as Meropesta capillacea (Reeve, 1854)
163. Species Mactra capillacea Deshayes, 1855 accepted as Mactra capillacea Reeve, 1854 accepted as Meropesta capillacea (Reeve, 1854) (synonym and homonym)
164. Species Mactra carinata Lamarck, 1818 accepted as Mactrellona alata (Spengler, 1802)
165. Species Mactra carinulata Reeve, 1854 accepted as Mulinia cleryana (A. d'Orbigny, 1846)
166. Species Mactra carinulata Deshayes, 1855 accepted as Mactra carinulata Reeve, 1854 accepted as Mulinia cleryana (A. d'Orbigny, 1846) (synonym and homonym)
167. Species Mactra carneopicta Pilsbry, 1904 accepted as Mactra chinensis R. A. Philippi, 1846
168. Species Mactra caspia Eichwald, 1840 † accepted as Ionesimactra caspia (Eichwald, 1840) † (unaccepted > superseded combination)
169. Species Mactra castanea Lamarck, 1818 accepted as Spisula solida (Linnaeus, 1758)
170. Species Mactra catilliformis (Conrad, 1867) accepted as Mactromeris catilliformis (Conrad, 1867) (unaccepted > superseded combination)
171. Species Mactra cecileana A. d'Orbigny, 1843 † accepted as Nucula (Leionucula) cecileana A. d'Orbigny, 1843 † (unaccepted > superseded combination)
172. Species Mactra chemnitzii Gray, 1837 accepted as Mactra antiquata Spengler, 1802
173. Species Mactra chrydaea Suter, 1911 † accepted as Maorimactra chrydaea (Suter, 1911) † (superseded combination)
174. Species Mactra cibaria R. A. Philippi, 1893 accepted as Mulinia exalbida J. E. Gray, 1837
175. Species Mactra cinerea Montagu, 1808 accepted as Mactra stultorum (Linnaeus, 1758) (synonym)
176. Species Mactra cleryana A. d'Orbigny, 1846 accepted as Mulinia cleryana (A. d'Orbigny, 1846) (original combination)
177. Species Mactra cojimbensis Anton, 1837 accepted as Mulinia edulis (P. P. King, 1832)
178. Species Mactra colchaguana Hupé, 1854 † accepted as Pitar colchaguana (Hupé, 1854) † (unaccepted > superseded combination)
179. Species Mactra colchaguensis R. A. Philippi, 1887 † accepted as Mactra colchaguana Hupé, 1854 † accepted as Pitar colchaguana (Hupé, 1854) † (unaccepted > unjustified emendation)
180. Species Mactra coloradoensis Dall, 1894 accepted as Mulinia modesta (P. P. Carpenter, 1864) (unaccepted > junior subjective synonym)
181. Species Mactra complanata Gmelin, 1791 accepted as Lutraria complanata (Gmelin, 1791)
182. Species Mactra complanata Reeve, 1854 accepted as Simomactra chionia (Tomlin, 1921) (unaccepted > junior homonym, Junior homonym of Mactra complanata Gmelin, 1791. Mactrinula chionia Tomlin, 1921 is a replacement name)
183. Species Mactra compressa Spengler, 1802 accepted as Mactrotoma compressa (Spengler, 1802)
184. Species Mactra compressa Pulteney, 1799 accepted as Scrobicularia plana (da Costa, 1778)
185. Species Mactra compressa Deshayes, 1832 † accepted as Austromactra compressa (Deshayes, 1832) † (unaccepted > superseded combination)
186. Species Mactra concentrica Bory de Saint-Vincent, 1827 accepted as Mactrellona alata (Spengler, 1802)
187. Species Mactra congesta Conrad, 1833 † accepted as Mulinia congesta (Conrad, 1833) † (unaccepted > superseded combination)
188. Species Mactra contortula Deshayes, 1857 † accepted as Austromactra contortula (Deshayes, 1857) † (unaccepted > superseded combination)
189. Species Mactra contraria Reeve, 1854 accepted as Austromactra contraria (Reeve, 1854)
190. Species Mactra contraria Deshayes, 1855 accepted as Mactra contraria Reeve, 1854 accepted as Austromactra contraria (Reeve, 1854) (synonym and homonym)
191. Species Mactra coppingeri E. A. Smith, 1884 accepted as Oxyperas coppingeri (E. A. Smith, 1884) (original combination)
192. Species Mactra coquimba R. A. Philippi, 1887 accepted as Spisula petitii (A. d'Orbigny, 1846) accepted as Mactra petitii A. d'Orbigny, 1846
193. Species Mactra coquimbana R. A. Philippi, 1893 accepted as Mulinia edulis (P. P. King, 1832)
194. Species Mactra corbiculoides Reeve, 1854 (unaccepted)
195. Species Mactra corbiculoides Deshayes, 1855 (unaccepted, synonym and homonym)
196. Species Mactra corbuloides Reeve, 1854 (unaccepted)
197. Species Mactra corbuloides Deshayes, 1855 (unaccepted)
198. Species Mactra cornea Reeve, 1854 (unaccepted)
199. Species Mactra cornea Poli, 1791 (unaccepted, original combination)
200. Species Mactra crassatella Lamarck, 1818 (unaccepted)
201. Species Mactra crassitesta Finlay, 1927 † (unaccepted, superseded combination)
202. Species Mactra crista Jousseaume, 1894 (unaccepted, junior synonym)
203. Species Mactra cumingiana Petit de la Saussaye, 1853 (unaccepted)
204. Species Mactra cuneola A. Gould, 1850 (unaccepted)
205. Species Mactra cuvieri Deshayes, 1854 (unaccepted)
206. Species Mactra cygnea Spengler, 1802 (unaccepted)
207. Species Mactra cygnea Lamarck, 1799 † (unaccepted)
208. Species Mactra cygnea R. A. Philippi, 1844 (unaccepted > junior homonym, junior homonym of Mactra cygnea Lamarck, 1799)
209. Species Mactra cyprinus W. Wood, 1828 (unaccepted, original combination)
210. Species Mactra cyrenoides Michelotti, 1861 † (unaccepted > junior subjective synonym)
211. Species Mactra danatensis A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
212. Species Mactra davidaschvilii A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
213. Species Mactra dealbata Pulteney, 1799 (unaccepted, original combination)
214. Species Mactra deaurata W. Turton, 1822 (unaccepted, original combination)
215. Species Mactra debilis A. Gould, 1850 (unaccepted)
216. Species Mactra decora Reeve, 1854 (unaccepted, junior synonym)
217. Species Mactra decora A. A. Ali-Zade & O. I. Popova, 1967 † (unaccepted, junior subjective synonym)
218. Species Mactra decora Deshayes, 1855 (unaccepted, synonym and homonym)
219. Species Mactra delicatula Preston, 1904 (unaccepted > junior subjective synonym)
220. Species Mactra deltoides Lamarck, 1818 (unaccepted)
221. Species Mactra delumbis Conrad, 1832 † (unaccepted > superseded combination)
222. Species Mactra deluta A. Gould, 1850 (unaccepted > junior subjective synonym)
223. Species Mactra depressa Spengler, 1802 (unaccepted)
224. Species Mactra depressa Lamarck, 1818 (unaccepted)
225. Species Mactra deshayesii Conrad, 1868 (unaccepted)
226. Species Mactra dianae A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
227. Species Mactra diolensis Bouchet & Nicklès, 1976 (unaccepted)
228. Species Mactra discors J. E. Gray, 1837 (unaccepted, superseded combination)
229. Species Mactra dissimilis Deshayes, 1855 (unaccepted, synonym and homonym)
230. Species Mactra dolabrata Reeve, 1854 (unaccepted)
231. Species Mactra dolabrata Deshayes, 1855 (unaccepted, synonym and homonym)
232. Species Mactra dolabriformis (Conrad, 1867) (unaccepted > superseded combination)
233. Species Mactra donacia Lamarck, 1818 (unaccepted)
234. Species Mactra dunkeri Yokoyama, 1922 (unaccepted)
235. Species Mactra dysoni Reeve, 1854 (unaccepted)
236. Species Mactra ebersini A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
237. Species Mactra edulis P. P. King, 1832 (unaccepted, original combination)
238. Species Mactra egena Reeve, 1854 (unaccepted)
239. Species Mactra egena Deshayes, 1855 (unaccepted, synonym and homonym)
240. Species Mactra eichwaldi Laskarev, 1914 † (unaccepted > superseded combination)
241. Species Mactra elegans G. B. Sowerby I, 1825 (unaccepted, original combination)
242. Species Mactra elegans F. W. Hutton, 1873 † (unaccepted, Invalid: not G.B. Sowerby I, 1825 (homonym). Mactra ordinaria E.A. Smith 1898 is a replacment name)
243. Species Mactra elliptica T. Brown, 1827 (unaccepted)
244. Species Mactra elongata Quoy & Gaimard, 1835 (unaccepted, superseded combination)
245. Species Mactra epidermia R. A. Philippi, 1893 (unaccepted > junior homonym, junior homonym of Mactra epidermia Deshayes in Reeve, 1854)
246. Species Mactra epidermia Reeve, 1854 (unaccepted)
247. Species Mactra erebea Brongniart, 1823 † (unaccepted > superseded combination)
248. Species Mactra estrellana Olsson, 1922 (unaccepted)
249. Species Mactra eurydicae A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
250. Species Mactra euxinica Krynicki, 1837 (unaccepted > nomen nudum)
251. Species Mactra exoleta J. E. Gray, 1837 (unaccepted, original combination)
252. Species Mactra explanata Deshayes, 1855 (unaccepted, synonym and homonym)
253. Species Mactra explanata Reeve, 1854 (unaccepted, superseded combination)
254. Species Mactra fabreana A. d'Orbigny, 1844 † (unaccepted > superseded combination)
255. Species Mactra falcata A. Gould, 1850 (unaccepted, original combination)
256. Species Mactra fasciata Lamarck, 1818 (unaccepted)
257. Species Mactra fauroti Jousseaume, 1888 (unaccepted, junior synonym)
258. Species Mactra fluviatilis Angas, 1871 (unaccepted)
259. Species Mactra fonsecana Hertlein & A. M. Strong, 1950 (unaccepted)
260. Species Mactra fragilis Gmelin, 1791 (unaccepted, original combination)
261. Species Mactra fragilis Chemnitz, 1782 (unaccepted > unavailable name, published in a work rejected by ICZN, 1944, Opinion 184)
262. Species Mactra fragilis Laskarew, 1903 † (unaccepted > junior homonym)
263. Species Mactra fujinensis Yokoyama, 1923 (unaccepted)
264. Species Mactra gabbi Tryon, 1870 (unaccepted)
265. Species Mactra gallina Spengler, 1802 (unaccepted)
266. Species Mactra gedroitzi (V. P. Kolesnikov, 1950) † (unaccepted, junior subjective synonym)
267. Species Mactra geranica A. A. Ali-Zade & Kabakova, 1967 † (unaccepted, junior subjective synonym)
268. Species Mactra gibba A. A. Ali-Zade & Kabakova, 1967 † (unaccepted, junior subjective synonym)
269. Species Mactra gibbosa A. A. Ali-Zade & O. I. Popova, 1967 † (unaccepted, junior subjective synonym)
270. Species Mactra gibbosula Reeve, 1854 (unaccepted)
271. Species Mactra gigantea Lamarck, 1818 (unaccepted > junior subjective synonym)
272. Species Mactra glabrata Gmelin, 1791 (unaccepted)
273. Species Mactra goniata Deshayes, 1855 (unaccepted)
274. Species Mactra goniocyma Pilsbry & H. N. Lowe, 1932 (unaccepted, original combination)
275. Species Mactra gracilis Locard, 1891 (unaccepted)
276. Species Mactra grandis Deshayes, 1832 (unaccepted)
277. Species Mactra grayana Schrenck, 1867 (unaccepted)
278. Species Mactra guadelupensis Récluz, 1852 (unaccepted)
279. Species Mactra helvacea Lamarck, 1818 (unaccepted)
280. Species Mactra hemphillii Dall, 1894 (unaccepted, original combination)
281. Species Mactra hepatica Reeve, 1854 (unaccepted)
282. Species Mactra hepatica Deshayes, 1855 (unaccepted, synonym and homonym)
283. Species Mactra hians Pulteney, 1799 (unaccepted)
284. Species Mactra hians R. A. Philippi, 1846 (unaccepted > junior homonym, junior homonym of Mactra hians Pulteney, 1799)
285. Species Mactra hiantina Deshayes, 1855 (unaccepted)
286. Species Mactra hoffstetteri Cauquoin, 1969 (unaccepted)
287. Species Mactra howchiniana Tate, 1887 † (unaccepted)
288. Species Mactra iheringi (Dall, 1897) (unaccepted)
289. Species Mactra imago Andrusov, 1905 † (unaccepted, junior subjective synonym)
290. Species Mactra inaequalis Deshayes, 1855 (unaccepted, synonym and homonym)
291. Species Mactra inceri Petuch, 1998 (unaccepted)
292. Species Mactra incongrua Reeve, 1854 (unaccepted)
293. Species Mactra incongrua Deshayes, 1855 (unaccepted, synonym and homonym)
294. Species Mactra inconstans Cosel, 1995 (unaccepted)
295. Species Mactra inflata Bronn, 1831 (unaccepted)
296. Species Mactra inflata F. W. Hutton, 1873 † (unaccepted, junior subjective synonym)
297. Species Mactra inostranzevi Andrusov, 1902 † (unaccepted)
298. Species Mactra intermedia Aradas, 1847 (unaccepted, dubious synonym)
299. Species Mactra intuspicta Deshayes, 1855 (unaccepted)
300. Species Mactra isthmia Jousseaume, 1888 (unaccepted)
301. Species Mactra isthmica Pilsbry & H. N. Lowe, 1932 (unaccepted, original combination)
302. Species Mactra janeiroensis E. A. Smith, 1915 (unaccepted, original combination)
303. Species Mactra jickelii Weinkauff, 1881 (unaccepted, junior synonym)
304. Species Mactra jonasi R. A. Philippi, 1893 (unaccepted > junior subjective synonym)
305. Species Mactra jousseaumi Mabille & Rochebrune, 1889 (unaccepted)
306. Species Mactra kambai A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
307. Species Mactra karabugasica Andrusov, 1902 † (unaccepted)
308. Species Mactra kolesnikovi A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
309. Species Mactra kraussi W. H. Turton, 1932 (unaccepted, junior synonym)
310. Species Mactra kuraense [sic] † (unaccepted, junior subjective synonym; incorrect original spelling)
311. Species Mactra kurense A. A. Ali-Zade & O. I. Popova, 1967 † (unaccepted, junior subjective synonym)
312. Species Mactra lacinata P. P. Carpenter, 1856 (unaccepted)
313. Species Mactra lactea Poli, 1791 (unaccepted)
314. Species Mactra lactea (Poli, 1795) sensu Lamarck, 1818 (unaccepted, misapplication)
315. Species Mactra lactea Gmelin, 1791 (unaccepted)
316. Species Mactra laevigata Schumacher, 1817 (unaccepted)
317. Species Mactra laevis Reeve, 1854 (unaccepted)
318. Species Mactra laevis Dunker, 1871 (unaccepted, junior synonym)
319. Species Mactra lamarckii R. A. Philippi, 1846 (unaccepted)
320. Species Mactra lamberti Deshayes, 1857 † (unaccepted > superseded combination)
321. Species Mactra laminifera E. Lamy, 1906 (unaccepted, original combination)
322. Species Mactra largillierti R. A. Philippi, 1849 (unaccepted)
323. Species Mactra lateralis Say, 1822 (unaccepted)
324. Species Mactra laudunensis Watelet, 1853 † (unaccepted > superseded combination)
325. Species Mactra lavata F. W. Hutton, 1885 † (unaccepted, junior subjective synonym)
326. Species Mactra leda H. J. Finlay, 1924 † (unaccepted, superseded combination)
327. Species Mactra lenticularis A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
328. Species Mactra levicardo E. A. Smith, 1881 (unaccepted, original combination)
329. Species Mactra lisor Anton, 1838 (unaccepted)
330. Species Mactra listeri Gmelin, 1791 (unaccepted)
331. Species Mactra loebbeckeana Weinkauff, 1881 (unaccepted)
332. Species Mactra longa A. A. Ali-Zade & Kabakova, 1969 † (unaccepted, junior subjective synonym)
333. Species Mactra lotensis R. A. Philippi, 1893 (unaccepted)
334. Species Mactra loustauae Bayan, 1873 † (unaccepted > superseded combination)
335. Species Mactra luedorfii Dunker, 1864 (unaccepted > junior subjective synonym)
336. Species Mactra luppovi A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
337. Species Mactra lurida R. A. Philippi, 1850 (unaccepted)
338. Species Mactra luteola Lovén, 1846 (unaccepted)
339. Species Mactra luzonica Deshayes, 1855 (unaccepted, synonym and homonym)
340. Species Mactra maculosa Lamarck, 1818 (unaccepted)
341. Species Mactra magellanica R. A. Philippi, 1893 (unaccepted)
342. Species Mactra mana A. A. Ali-Zade & O. I. Popova, 1967 † (unaccepted, junior subjective synonym)
343. Species Mactra marcida A. Gould, 1850 (unaccepted)
344. Species Mactra mariae A. Adams, 1856 (unaccepted, junior subjective synonym)
345. Species Mactra markovae A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
346. Species Mactra matthewsi Tate, 1889 (unaccepted)
347. Species Mactra mendica A. Gould, 1851 (unaccepted, original combination)
348. Species Mactra mera Reeve, 1854 (unaccepted)
349. Species Mactra meretriciformis Reeve, 1854 (unaccepted)
350. Species Mactra micronitida Cosel, 1995 (unaccepted)
351. Species Mactra minerva A. A. Ali-Zade & O. I. Popova, 1967 † (unaccepted, junior subjective synonym)
352. Species Mactra minutissima Montagu, 1808 (unaccepted)
353. Species Mactra miserabilis Andrusov, 1902 † (unaccepted)
354. Species Mactra modesta P. P. Carpenter, 1864 (unaccepted, original combination)
355. Species Mactra mula Marwick, 1948 † (unaccepted, superseded combination)
356. Species Mactra murchisoni Deshayes, 1855 (unaccepted, synonym and homonym)
357. Species Mactra murchisoni Reeve, 1854 (unaccepted, superseded combination)
358. Species Mactra nasuta A. Gould, 1851 (unaccepted, original combination)
359. Species Mactra nazarlebi K. A. Ali-Zade, 1932 † (unaccepted)
360. Species Mactra neapolitana Poli, 1791 (unaccepted)
361. Species Mactra nebulosa Bory de Saint-Vincent, 1827 (unaccepted)
362. Species Mactra nicobarica Gmelin, 1791 (unaccepted)
363. Species Mactra nitida Gmelin, 1791 (unaccepted)
364. Species Mactra nitida Spengler, 1802 (unaccepted, not an available name; available from Gmelin, 1791)
365. Species Mactra nuttallii Reeve, 1854 (unaccepted)
366. Species Mactra obesa Deshayes, 1854 (unaccepted)
367. Species Mactra oblonga Say, 1822 (unaccepted)
368. Species Mactra ochracea E. von Martens, 1879 (unaccepted, junior synonym)
369. Species Mactra opipara A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
370. Species Mactra opposita Deshayes, 1855 (unaccepted, synonym and homonym)
371. Species Mactra ordinaria E. A. Smith, 1898 (unaccepted, superseded combination)
372. Species Mactra ornata Gray, 1837 (unaccepted)
373. Species Mactra ossoskovi Andrusov, 1902 † (unaccepted)
374. Species Mactra ovalina E. A. Smith, 1914 (unaccepted)
375. Species Mactra ovalina Lamarck, 1818 (unaccepted, original combination)
376. Species Mactra ovalis J. Sowerby, 1817 † (unaccepted)
377. Species Mactra ovalis A. Gould, 1840 (unaccepted, invalid: junior homonym of Mactra ovalis J. Sowerby, 1817; Mactra polynyma is a replacement name)
378. Species Mactra ovata W. Wood, 1828 (unaccepted)
379. Species Mactra pacata A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
380. Species Mactra paitensis R. A. Philippi, 1893 (unaccepted)
381. Species Mactra pallida Broderip & G. B. Sowerby I, 1829 (unaccepted, original combination)
382. Species Mactra papillata A. A. Ali-Zade, 1967 † (unaccepted, junior subjective synonym)
383. Species Mactra papyracea Chemnitz, 1782 (unaccepted, unavailable name: published in a work rejected by ICZN Direction 1; available from Gmelin, 1791)
384. Species Mactra papyracea Gmelin, 1791 (unaccepted > superseded combination)
385. Species Mactra parameces Cossmann, 1886 † (unaccepted > superseded combination)
386. Species Mactra parkesiana Hedley, 1902 (unaccepted, junior subjective synonym)
387. Species Mactra paulucci Aradas & Benoit, 1871 (unaccepted > junior subjective synonym)
388. Species Mactra paulucciae Locard, 1890 (unaccepted, unjustified emendation of paulucci Aradas & Benoit, 1872)
389. Species Mactra pellicula Reeve, 1854 (unaccepted)
390. Species Mactra pellicula Deshayes, 1855 (unaccepted, synonym and homonym)
391. Species Mactra pellucida Gmelin, 1791 (unaccepted)
392. Species Mactra pencana R. A. Philippi, 1893 (unaccepted)
393. Species Mactra pinguis Crosse & P. Fischer, 1864 (unaccepted)
394. Species Mactra piperata Poiret, 1789 (unaccepted)
395. Species Mactra plana Belokrys, 1964 † (unaccepted > superseded combination)
396. Species Mactra planata Spengler, 1802 (unaccepted)
397. Species Mactra planulata Conrad, 1837 (unaccepted)
398. Species Mactra plicataria Linnaeus, 1767 (unaccepted)
399. Species Mactra plicatilis Reeve, 1854 (unaccepted)
400. Species Mactra plicatilis Deshayes, 1855 (unaccepted, synonym and homonym)
401. Species Mactra polita Reeve, 1854 (unaccepted)
402. Species Mactra polynyma W. Stimpson, 1860 (unaccepted > superseded combination)
403. Species Mactra ponderosa R. A. Philippi, 1844 (unaccepted)
404. Species Mactra ponderosa Conrad, 1830 † (unaccepted > junior homonym)
405. Species Mactra portentosa A. A. Ali-Zade, 1967 † (unaccepted, junior subjective synonym)
406. Species Mactra proaspersa Sacco, 1901 sensu Ardovini & al., 2004 (unaccepted)
407. Species Mactra procera Dillwyn, 1817 (unaccepted > junior subjective synonym)
408. Species Mactra pulchra Gray, 1837 (unaccepted, junior synonym)
409. Species Mactra pulla R. A. Philippi, 1849 (unaccepted)
410. Species Mactra purpurea Spengler, 1802 (unaccepted)
411. Species Mactra radiata Spengler, 1802 (unaccepted)
412. Species Mactra radiata Donovan, 1803 (unaccepted)
413. Species Mactra radiolata Reeve, 1854 (unaccepted)
414. Species Mactra radiolata Deshayes, 1855 (unaccepted, synonym and homonym)
415. Species Mactra raveneli Conrad, 1832 (unaccepted)
416. Species Mactra recondita Deshayes, 1857 † (unaccepted > superseded combination)
417. Species Mactra recurva W. Wood, 1828 (unaccepted)
418. Species Mactra reevei Reeve, 1854 (unaccepted)
419. Species Mactra reevesii J. E. Gray, 1837 (unaccepted, original combination)
420. Species Mactra reticulata Spengler, 1802 (unaccepted)
421. Species Mactra richmondi Dall, 1894 (unaccepted)
422. Species Mactra rostralis Reeve, 1854 (unaccepted)
423. Species Mactra rostralis Deshayes, 1855 (unaccepted, synonym and homonym)
424. Species Mactra rostrata Spengler, 1802 (unaccepted)
425. Species Mactra rostrata Spengler, 1802 sensu Reeve, 1854 (unaccepted, misapplication)
426. Species Mactra rostrata R. A. Philippi, 1849 (unaccepted)
427. Species Mactra rudis F. W. Hutton, 1873 † (unaccepted, junior subjective synonym)
428. Species Mactra rufa Lamarck, 1818 (unaccepted)
429. Species Mactra rufanensis W. H. Turton, 1932 (unaccepted, junior synonym)
430. Species Mactra rufescens Lamarck, 1818 (unaccepted)
431. Species Mactra rugata G. B. Sowerby I, 1846 † (unaccepted > superseded combination)
432. Species Mactra rugifera Dunker, 1862 (unaccepted)
433. Species Mactra rugosa Helbling, 1779 (unaccepted > superseded combination)
434. Species Mactra sachalinensis Schrenck, 1862 (unaccepted)
435. Species Mactra sanctiblasii Maury, 1925 (unaccepted)
436. Species Mactra sauliae [sic] (unaccepted, incorrect subsequent spelling of sauliana Gray, 1838 in Reeve (1854) and subsequent authors)
437. Species Mactra saulii [sic] (unaccepted, incorrect subsequent spelling by Hanley, 1843)
438. Species Mactra scalpellum Reeve, 1854 (unaccepted, superseded combination)
439. Species Mactra scalpellum Deshayes, 1855 (unaccepted, synonym and homonym)
440. Species Mactra schirvanica Andrusov, 1905 † (unaccepted > superseded combination)
441. Species Mactra semistriata Reeve, 1854 (unaccepted, junior synonym)
442. Species Mactra semisulcata Reeve, 1854 (unaccepted > junior homonym, junior homonym of Mactra semisulcata Lamarck, 1805)
443. Species Mactra semisulcata Lamarck, 1805 † (unaccepted > superseded combination)
444. Species Mactra senegalensis R. A. Philippi, 1849 sensu Reeve, 1854 (unaccepted > misapplication)
445. Species Mactra senegalensis R. A. Philippi, 1849 (unaccepted > junior subjective synonym)
446. Species Mactra sericea Brusina, 1865 (unaccepted)
447. Species Mactra sericea Deshayes, 1855 (unaccepted, synonym and homonym)
448. Species Mactra setosa Quoy & Quimard, 1835 (unaccepted)
449. Species Mactra sibyllae Valenciennes, 1858 (unaccepted > superseded combination)
450. Species Mactra silicula Deshayes, 1855 (unaccepted, junior primary homonym of Mactra silicula Reeve, 1854)
451. Species Mactra silicula Reeve, 1854 (unaccepted)
452. Species Mactra similis W. Wood, 1828 (unaccepted)
453. Species Mactra similis Say, 1822 (unaccepted)
454. Species Mactra sirena Brongniart, 1823 † (unaccepted > superseded combination)
455. Species Mactra solida (Linnaeus, 1758) (unaccepted > superseded combination)
456. Species Mactra solidissima Dillwyn, 1817 (unaccepted > superseded combination)
457. Species Mactra spectabilis Lischke, 1871 (unaccepted)
458. Species Mactra spengleri Linnaeus, 1767 (unaccepted)
459. Species Mactra squalida Lamarck, 1818 (unaccepted)
460. Species Mactra straminea Lamarck, 1818 (unaccepted)
461. Species Mactra striata Gmelin, 1791 (unaccepted)
462. Species Mactra striata Spengler, 1802 (unaccepted)
463. Species Mactra striata Nyst, 1845 (unaccepted)
464. Species Mactra striata T. Brown, 1827 (unaccepted)
465. Species Mactra striatella Lamarck, 1818 (unaccepted)
466. Species Mactra striatula Linnaeus, 1767 (unaccepted)
467. Species Mactra subalata Mörch, 1860 (unaccepted, original combination)
468. Species Mactra subcaspia Andrusov, 1902 † (unaccepted)
469. Species Mactra sublanceolata Deshayes, 1855 (unaccepted)
470. Species Mactra subplicata Lamarck, 1818 (unaccepted)
471. Species Mactra subplicata W. Wood, 1828 (unaccepted)
472. Species Mactra subrostrata Reeve, 1854 (unaccepted)
473. Species Mactra subtriangulata W. Wood, 1828 (unaccepted, superseded combination)
474. Species Mactra subtrigona (S. V. Wood, 1841) (unaccepted)
475. Species Mactra subtruncata (da Costa, 1778) (unaccepted)
476. Species Mactra sulcata Bory de Saint-Vincent, 1827 (unaccepted)
477. Species Mactra sulcataria Reeve, 1854 (unaccepted)
478. Species Mactra sulini A. A. Ali-Zade & Kabakova, 1967 † (unaccepted, junior subjective synonym)
479. Species Mactra symmetrica Reeve, 1854 (unaccepted)
480. Species Mactra symmetrica A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
481. Species Mactra tapesoides Sinzov, 1897 † (unaccepted > superseded combination)
482. Species Mactra taprobanensis W. Wood, 1828 (unaccepted)
483. Species Mactra taprobanensis Preston, 1904 (unaccepted > junior subjective synonym, preoccupied by Mactra taprobanensis Wood, 1828)
484. Species Mactra tarda A. A. Ali-Zade & Kabakova, 1967 † (unaccepted, tentative junior subjective synonym)
485. Species Mactra targioni Aradas & Benoit, 1872 (unaccepted)
486. Species Mactra tellinoides Pulteney, 1799 (unaccepted)
487. Species Mactra tellinoides Conrad, 1831 (unaccepted, invalid: junior homonym of Mactra tellinoides Pulteney, 1799)
488. Species Mactra tenera W. Wood, 1828 (unaccepted)
489. Species Mactra tenuis Montagu, 1803 (unaccepted)
490. Species Mactra thracioides A. Adams & Reeve, 1850 (unaccepted > superseded combination)
491. Species Mactra transversa Reeve, 1854 (unaccepted)
492. Species Mactra transversa Deshayes, 1855 (unaccepted, synonym and homonym)
493. Species Mactra triangula Brocchi, 1814 (unaccepted)
494. Species Mactra triangularis Montagu, 1803 (unaccepted)
495. Species Mactra triangularis Lamarck, 1818 (unaccepted, Invalid: junior homonym of Mactra triangularis Montagu, 1803)
496. Species Mactra trigonella Lamarck, 1818 (unaccepted)
497. Species Mactra tristis Deshayes, 1855 (unaccepted, synonym and homonym)
498. Species Mactra tristis Reeve, 1854 (unaccepted, superseded combination)
499. Species Mactra truncata Montagu, 1808 (unaccepted)
500. Species Mactra tumida Spengler, 1802 (unaccepted)
501. Species Mactra turkmena A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
502. Species Mactra unicolor Bory de Saint-Vincent, 1827 (unaccepted)
503. Species Mactra uzboica A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
504. Species Mactra vanattae Pilsbry & H. N. Lowe, 1932 (unaccepted, junior synonym)
505. Species Mactra velata R. A. Philippi, 1849 (unaccepted > superseded combination)
506. Species Mactra veneriformis Reeve, 1854 (unaccepted)
507. Species Mactra veneriformis W. Wood, 1828 (unaccepted > junior subjective synonym)
508. Species Mactra venjukovi Andrusov, 1902 † (unaccepted)
509. Species Mactra venusta A. A. Ali-Zade & Kabakova, 1967 † (unaccepted, tentative junior subjective synonym)
510. Species Mactra vestae A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
511. Species Mactra virgo Reeve, 1854 (unaccepted)
512. Species Mactra virgo Deshayes, 1855 (unaccepted, synonym and homonym)
513. Species Mactra vitaliana A. d'Orbigny, 1844 † (unaccepted > superseded combination)
514. Species Mactra vitrea Spengler, 1802 (unaccepted)
515. Species Mactra vitrea Gray, 1837 (unaccepted, junior homonym of Mactra vitrea Spengler, 1802; Anatina grayi is a replacement name)
516. Species Mactra vitrea Dillwyn, 1817 (unaccepted, The first author to make this name available (taken from Chemnitz, 1795, non-binomial) was Spengler (1802) id=540849, therefore Dillwyn is not deemed to have introduced a new name. (Gofas, Serge))
517. Species Mactra vitrea Chemnitz, 1795 (unaccepted, unavailable name: published in a work rejected by ICZN direction 1; available from Spengler, 1802)
518. Species Mactra williamsi Marwick, 1948 † (unaccepted, original combination)
519. Species Mactra williamsi S. S. Berry, 1960 (unaccepted, invalid: junior homonym of Mactra williamsi Marwick, 1948)
520. Species Mactra zellwegeri Jousseaume, 1894 (unaccepted, junior synonym)
521. Species Mactra zhizhchenkoi A. A. Ali-Zade, 1967 † (unaccepted, tentative junior subjective synonym)
522. Species Mactra zonata Lischke, 1871 (unaccepted, junior subjective synonym)
523. Species Mactra zorritensis E. T. Nelson, 1870 † (unaccepted > superseded combination)
524. Subgenus Mactra (Coelomactra) Dall, 1895 (alternative representation)
     1. Species Mactra (Coelomactra) nasongoensis Ladd, 1934 † accepted as Coelomactra nasongoensis (Ladd, 1934) †
525. Subgenus Mactra (Eomactra) Cossmann, 1909 † represented as Mactra Linnaeus, 1767
     1. Species Mactra (Eomactra) bajarunasi V. P. Kolesnikov, 1925 † represented as Mactra bajarunasi V. P. Kolesnikov, 1925 †
     2. Species Mactra (Eomactra) basteroti (Mayer-Eymar, 1853) † represented as Mactra basteroti Mayer, 1853 †
526. Subgenus Mactra (Mactra) Linnaeus, 1767 represented as Mactra Linnaeus, 1767
     1. Species Mactra (Mactra) williamsi S. S. Berry, 1960 accepted as Spisula adamsi Olsson, 1961
527. Subgenus Mactra (Mactrella) J. E. Gray, 1853 represented as Mactrella J. E. Gray, 1853
     1. Species Mactra (Mactrella) alata (Spengler, 1802) accepted as Mactrellona alata (Spengler, 1802) (unaccepted > superseded combination)
528. Subgenus Mactra (Mactrinula) J. E. Gray, 1853 represented as Mactrinula J. E. Gray, 1853
     1. Species Mactra (Mactrinula) goniocyma Pilsbry & H. N. Lowe, 1932 accepted as Mactrinula goniocyma (Pilsbry & H. N. Lowe, 1932)
     2. Species Mactra (Mactrinula) janeiroensis E. A. Smith, 1915 accepted as Mactrotoma janeiroensis (E. A. Smith, 1915) (basionym)
529. Subgenus Mactra (Nannomactra) Iredale, 1930 represented as Mactra Linnaeus, 1767
530. Species Mactra ambigua R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. araucana d'Orbigny, 1843)
531. Species Mactra amphirrhyncha R. A. Philippi, 1887 † (uncertain > unassessed)
532. Species Mactra apicina R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. apicina Reeve, 1854)
533. Species Mactra araucana A. d'Orbigny, 1843 † (uncertain > unassessed)
534. Species Mactra arcuata J. Sowerby, 1817 † (uncertain > unassessed)
535. Species Mactra auca A. d'Orbigny, 1843 † (uncertain > nomen dubium)
536. Species Mactra biangulata R. A. Philippi, 1887 † (uncertain > unassessed)
537. Species Mactra bignoniana A. d'Orbigny, 1844 † (uncertain > unassessed)
538. Species Mactra bullata Deshayes, 1855 (uncertain > taxon inquirendum)
539. Species Mactra carbonaria R. A. Philippi, 1887 † (uncertain > unassessed)
540. Species Mactra carteroni A. d'Orbigny, 1845 † (uncertain > unassessed)
541. Species Mactra chazarica A. A. Ali-Zade, 1967 † (uncertain > taxon inquirendum)
542. Species Mactra chiliensis W. M. Gabb, 1861 † (uncertain > unassessed)
543. Species Mactra colossea R. A. Philippi, 1887 † (uncertain > unassessed)
544. Species Mactra conchae R. A. Philippi, 1887 † (uncertain > unassessed)
545. Species Mactra cuadrae R. A. Philippi, 1887 † (uncertain > unassessed)
546. Species Mactra cuneata J. Sowerby, 1817 † (uncertain > unassessed)
547. Species Mactra diaphana Anton, 1837 (uncertain > taxon inquirendum)
548. Species Mactra dorbignyi R. A. Philippi, 1887 † (uncertain > unassessed)
549. Species Mactra dubia J. Sowerby, 1817 † (uncertain > unassessed)
550. Species Mactra dubia R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. dubia Sowerby, 1817 and M. dubia d'Archiac, 1854)
551. Species Mactra dupiniana A. d'Orbigny, 1845 † (uncertain > unassessed)
552. Species Mactra excisa Anton, 1838 (uncertain, status in recent literature not researched by editor)
553. Species Mactra ferrieri R. A. Philippi, 1887 † (uncertain > unassessed)
554. Species Mactra gabbi R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. gabbi Tryon, 1870)
555. Species Mactra ganae R. A. Philippi, 1887 † (uncertain > unassessed)
556. Species Mactra gibbosa J. Sowerby, 1813 † (uncertain > unassessed)
557. Species Mactra hualpensis R. A. Philippi, 1887 † (uncertain > unassessed)
558. Species Mactra hyalina Brocchi, 1814 † (uncertain > unassessed)
559. Species Mactra ignobilis R. A. Philippi, 1887 † (uncertain > unassessed)
560. Species Mactra indistincta Ihering, 1897 † (uncertain > unassessed)
561. Species Mactra involuta R. A. Philippi, 1887 † (uncertain > unassessed)
562. Species Mactra lebuensis R. A. Philippi, 1887 † (uncertain > unassessed)
563. Species Mactra lenos R. A. Philippi, 1887 † (uncertain > unassessed)
564. Species Mactra lepida R. A. Philippi, 1887 † (uncertain > unassessed)
565. Species Mactra matronensis A. d'Orbigny, 1845 † (uncertain > unassessed)
566. Species Mactra medinae R. A. Philippi, 1887 † (uncertain > unassessed)
567. Species Mactra nesaea R. A. Philippi, 1887 † (uncertain > unassessed)
568. Species Mactra nitida R. A. Philippi, 1887 (uncertain > unassessed, junior homonym of M. nitida Gmelin, 1798, and M. nitida Spengler, 1802)
569. Species Mactra nucleus Conrad, 1831 (uncertain > nomen dubium)
570. Species Mactra nucleus R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. nucleus Conrad, 1831)
571. Species Mactra oblonga R. A. Philippi, 1887 † (uncertain > unassessed, junior primary homonym of Mactra oblonga Say, 1822)
572. Species Mactra ovallei R. A. Philippi, 1887 † (uncertain > nomen dubium)
573. Species Mactra oxyrrhyncha R. A. Philippi, 1887 † (uncertain > unassessed)
574. Species Mactra pinguis R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M. pinguis Crosse & Fischer, 1864)
575. Species Mactra plebeja R. A. Philippi, 1887 † (uncertain > unassessed)
576. Species Mactra pusilla R. A. Philippi, 1887 † (uncertain > unassessed, junior primary homonym of Mactra pusilla A. Adams, 1856)
577. Species Mactra quiriquinae R. A. Philippi, 1887 † (uncertain > unassessed)
578. Species Mactra radiosa Lesson, 1831 (uncertain > unassessed)
579. Species Mactra remondi R. A. Philippi, 1887 † (uncertain > unassessed)
580. Species Mactra sagei R. A. Philippi, 1887 † (uncertain > unassessed)
581. Species Mactra scolia R. A. Philippi, 1887 † (uncertain > unassessed)
582. Species Mactra similis G. B. Sowerby I, 1839 (uncertain > taxon inquirendum, preoccupied)
583. Species Mactra simplex R. A. Philippi, 1887 † (uncertain > unassessed)
584. Species Mactra splendidula R. A. Philippi, 1887 † (uncertain > unassessed)
585. Species Mactra steinmanni R. A. Philippi, 1887 † (uncertain > unassessed)
586. Species Mactra subangulata R. A. Philippi, 1887 † (uncertain > unassessed)
587. Species Mactra sulcata R. A. Philippi, 1887 † (uncertain > unassessed, junior primary homonym of Mactra sulcata Bory de Saint-Vincent, 1827)
588. Species Mactra tenuis R. A. Philippi, 1857 † (uncertain > unassessed, junior homonym of M. tenuis Montagu, 1803)
589. Species Mactra texana Conrad, 1855 † (uncertain > unassessed)
590. Species Mactra triangulare Hector, 1870 (uncertain > nomen dubium, Not Mactra triangularis Montagu, 1803 (homonym))
591. Species Mactra trigona Anton, 1838 (uncertain, status in recent literature not researched by editor)
592. Species Mactra trigona Zieten, 1833 † (uncertain > unassessed)
593. Species Mactra tripartita G. B. Sowerby I, 1846 † (uncertain > taxon inquirendum, use in recent liteature currently undocumented)
594. Species Mactra truncatula R. A. Philippi, 1887 † (uncertain > unassessed)
595. Species Mactra tumida R. A. Philippi, 1887 † (uncertain > unassessed, junior homonym of M tumida Spengler, 1802)
596. Species Mactra vaga R. A. Philippi, 1887 † (uncertain > unassessed)
597. Species Mactra valdiviana R. A. Philippi, 1887 † (uncertain > unassessed)
598. Species Mactra varians R. A. Philippi, 1887 † (uncertain > unassessed)
599. Species Mactra vicentina R. A. Philippi, 1887 † (uncertain > unassessed)
600. Species Mactra vidali R. A. Philippi, 1887 † (uncertain > unassessed)

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