1. Species Myzostomum abundans Graff, 1883 accepted as Myzostoma abundans Graff, 1883
2. Species Myzostomum adhaerens Remscheid, 1918 accepted as Myzostoma adhaerens Remscheid, 1918
3. Species Myzostomum agassizii Graff, 1883 accepted as Myzostoma agassizii Graff, 1883
4. Species Myzostomum alatum Graff, 1884 accepted as Myzostoma alatum Graff, 1884
5. Species Myzostomum ambiguum Graff, 1887 accepted as Myzostoma ambiguum Graff, 1887
6. Species Myzostomum antarcticum Stummer-Traunfels, 1908 accepted as Myzostoma antarcticum Stummer-Traunfels, 1908
7. Species Myzostomum antennatum Graff, 1884 accepted as Myzostoma antennatum Graff, 1884
8. Species Myzostomum areolatum Graff, 1883 accepted as Myzostoma areolatum Graff, 1883
9. Species Myzostomum aruense Remscheid, 1918 accepted as Myzostoma aruense Remscheid, 1918
10. Species Myzostomum asteriae [auct. misspelling] accepted as Asteriomyzostomum asteriae (Marenzeller, 1895) (incorrect genus spelling of superseded original combination)
11. Species Myzostomum asymmetricum Graff, 1884 accepted as Myzostoma asymmetricum Graff, 1884
12. Species Myzostomum atrum Atkins, 1927 accepted as Myzostoma atrum Atkins, 1927
13. Species Myzostomum beardi Graff, 1887 accepted as Myzostoma beardi Graff, 1887
14. Species Myzostomum belli Wheeler, 1897 accepted as Myzostoma belli Wheeler, 1897
15. Species Myzostomum bicaudatum Greeff, 1883 accepted as Myzostoma bicaudatum Greeff, 1883
16. Species Myzostomum bicorne Remscheid, 1918 accepted as Myzostoma bicorne Remscheid, 1918
17. Species Myzostomum bocki Jägersten, 1937 accepted as Myzostoma bocki Jägersten, 1937
18. Species Myzostomum brachiatum Graff, 1877 accepted as Myzostoma brachiatum Graff, 1877
19. Species Myzostomum brevicirrum Graff, 1884 accepted as Myzostoma brevicirrum Graff, 1884
20. Species Myzostomum brevilobatum Jägersten, 1937 accepted as Myzostoma brevilobatum Jägersten, 1937
21. Species Myzostomum brevipes Graff, 1883 accepted as Myzostoma brevipes Graff, 1883
22. Species Myzostomum bucchichii Wagner, 1887 accepted as Myzostoma bucchichii Wagner, 1887
23. Species Myzostomum calycotyle Graff, 1884 accepted as Myzostoma calycotyle Graff, 1884
24. Species Myzostomum caribbeanum Graff, 1883 accepted as Myzostoma caribbeanum Graff, 1883
25. Species Myzostomum carinatum Graff, 1883 accepted as Myzostoma carinatum Graff, 1883
26. Species Myzostomum carpenteri Graff, 1884 accepted as Myzostoma carpenteri Graff, 1884
27. Species Myzostomum cerriferoidum McClendon, 1907 accepted as Myzostoma cerriferoidum McClendon, 1907
28. Species Myzostomum chelonium McClendon, 1906 accepted as Myzostoma chelonium McClendon, 1906
29. Species Myzostomum chelonoidium McClendon, 1906 accepted as Myzostoma chelonoidium McClendon, 1906
30. Species Myzostomum chinesicum Graff, 1884 accepted as Myzostoma chinesicum Graff, 1884
31. Species Myzostomum circinatum Wheeler, 1897 accepted as Myzostoma circinatum Wheeler, 1897
32. Species Myzostomum cirricostatum Jägersten, 1937 accepted as Myzostoma cirricostatum Jägersten, 1937
33. Species Myzostomum cirriferum Leuckart, 1836 accepted as Myzostoma cirriferum Leuckart, 1836
34. Species Myzostomum cirripedium [auct. misspelling] accepted as Eenymeenymyzostoma cirripedium (Graff, 1885) (genus misspelling of superseded original combination)
35. Species Myzostomum clarki McClendon, 1906 accepted as Myzostoma clarki McClendon, 1906
36. Species Myzostomum compressum Graff, 1884 accepted as Myzostoma compressum Graff, 1884
37. Species Myzostomum coriaceum Graff, 1884 accepted as Myzostoma coriaceum Graff, 1884
38. Species Myzostomum cornutum Graff, 1877 accepted as Myzostoma cornutum Graff, 1877
39. Species Myzostomum coronatum Graff, 1884 accepted as Myzostoma coronatum Graff, 1884
40. Species Myzostomum costatum Leuckart, 1830 accepted as Myzostoma costatum Leuckart, 1830
41. Species Myzostomum crenatum Graff, 1883 accepted as Myzostoma crenatum Graff, 1883
42. Species Myzostomum cristatum Remscheid, 1918 accepted as Myzostoma cristatum Remscheid, 1918
43. Species Myzostomum crosslandi Boulenger, 1913 accepted as Hypomyzostoma crosslandi (Boulenger, 1913) (unaccepted > superseded combination, superseded original combination)
44. Species Myzostomum cryptopodium Wheeler, 1897 accepted as Myzostoma cryptopodium Wheeler, 1897
45. Species Myzostomum cubanum McClendon, 1907 accepted as Myzostoma cubanum McClendon, 1907
46. Species Myzostomum cysticolum Graff, 1883 accepted as Myzostoma cysticolum Graff, 1883
47. Species Myzostomum deani McClendon, 1906 accepted as Myzostoma deani McClendon, 1906
48. Species Myzostomum deformator Graff, 1884 accepted as Myzostoma deformator Graff, 1884
49. Species Myzostomum dentatum Graff, 1884 accepted as Myzostoma dentatum Graff, 1884
50. Species Myzostomum dubium Graff, 1877 accepted as Myzostoma dubium Graff, 1877 (genus misspelling)
51. Species Myzostomum echinus Graff, 1884 accepted as Myzostoma echinus Graff, 1884
52. Species Myzostomum elegans Graff, 1877 accepted as Myzostoma elegans Graff, 1877
53. Species Myzostomum elongatum Graff, 1877 accepted as Myzostoma elongatum Graff, 1877
54. Species Myzostomum eremita Wheeler, 1897 accepted as Myzostoma eremita Wheeler, 1897
55. Species Myzostomum evermanni McClendon, 1907 accepted as Myzostoma evermanni McClendon, 1907
56. Species Myzostomum excisum Graff, 1883 accepted as Myzostoma excisum Graff, 1883
57. Species Myzostomum fasciatum Remscheid, 1918 accepted as Myzostoma fasciatum Remscheid, 1918
58. Species Myzostomum filicauda Graff, 1883 accepted as Myzostoma filicauda Graff, 1883
59. Species Myzostomum filiferum (Graff, 1844) accepted as Myzostoma filiferum Graff, 1884 (superseded subsequent combination using alternate genus spelling)
60. Species Myzostomum fimbriatum Graff, 1884 accepted as Myzostoma fimbriatum Graff, 1884
61. Species Myzostomum fisheri [auct. misspelling] accepted as Asteriomyzostomum fisheri (Wheeler, 1905) (incorrect genus spelling of superseded original combination)
62. Species Myzostomum fissum Graff, 1884 accepted as Myzostoma fissum Graff, 1884
63. Species Myzostomum folium Graff, 1884 accepted as Myzostoma folium Graff, 1884
64. Species Myzostomum furcatum Graff, 1887 accepted as Myzostoma furcatum Graff, 1887
65. Species Myzostomum gardineri Atkins, 1927 accepted as Myzostoma gardineri Atkins, 1927
66. Species Myzostomum gerlachei Fauvel, 1936 accepted as Myzostoma gerlachei Fauvel, 1936
67. Species Myzostomum giganteum Nansen, 1885 accepted as Myzostoma giganteum Nansen, 1885
68. Species Myzostomum gigas Luetken in Graff, 1884 accepted as Myzostoma gigas Luetken in Graff, 1884
69. Species Myzostomum glabrum Leuckart in Graff, 1877 accepted as Myzostoma glabrum Graff, 1877
70. Species Myzostomum gopalai Subramaniam in George, 1943 accepted as Myzostoma gopalai Subramaniam in George, 1943
71. Species Myzostomum graffi Nansen, 1885 accepted as Myzostoma graffi Nansen, 1885
72. Species Myzostomum holotuberculatum Jägersten, 1940 accepted as Myzostoma holotuberculatum Jägersten, 1940
73. Species Myzostomum horologium Graff, 1884 accepted as Myzostoma horologium Graff, 1884
74. Species Myzostomum ijimai Hara & Okada, 1921 accepted as Myzostoma ijimai Hara & Okada, 1921
75. Species Myzostomum inflator Graff, 1883 accepted as Myzostoma inflator Graff, 1883
76. Species Myzostomum ingolfi Jägersten, 1940 accepted as Myzostoma ingolfi Jägersten, 1940
77. Species Myzostomum insigne Atkins, 1927 accepted as Myzostoma insigne Atkins, 1927
78. Species Myzostomum intermedium Graff, 1884 accepted as Myzostoma intermedium Graff, 1884
79. Species Myzostomum irregulare Graff, 1883 accepted as Myzostoma irregulare Graff, 1883
80. Species Myzostomum japonicum McClendon, 1906 accepted as Myzostoma japonicum McClendon, 1906
81. Species Myzostomum labiatum Graff, 1884 accepted as Myzostoma labiatum Graff, 1884
82. Species Myzostomum lobatum Graff, 1877 accepted as Myzostoma lobatum Graff, 1877
83. Species Myzostomum longimanum Jägersten, 1934 accepted as Myzostoma longimanum Jägersten, 1934
84. Species Myzostomum longipes Graff, 1883 accepted as Myzostoma longipes Graff, 1883
85. Species Myzostomum luetkeni Graff, 1884 accepted as Myzostoma luetkeni Graff, 1884
86. Species Myzostomum maculatum Jägersten, 1937 accepted as Myzostoma maculatum Jägersten, 1937
87. Species Myzostomum marginatum Graff, 1883 accepted as Myzostoma marginatum Graff, 1883
88. Species Myzostomum membranaceum Graff, 1887 accepted as Hypomyzostoma membranaceum (Graff, 1887)
89. Species Myzostomum mertoni Remscheid, 1918 accepted as Myzostoma mertoni Remscheid, 1918
90. Species Myzostomum metacrini [auct. misspelling] accepted as Eenymeenymyzostoma cirripedium (Graff, 1885) (genus misspelling of superseded original combination)
91. Species Myzostomum moebianum Graff, 1884 accepted as Myzostoma moebianum Graff, 1884
92. Species Myzostomum mortenseni Jägersten, 1940 accepted as Myzostoma mortenseni Jägersten, 1940
93. Species Myzostomum murrayi Graff, 1883 accepted as Myzostoma murrayi Graff, 1883
94. Species Myzostomum nanseni Graff, 1887 accepted as Myzostoma nanseni Graff, 1887
95. Species Myzostomum nigrescens Graff, 1884 accepted as Myzostoma nigrescens Graff, 1884
96. Species Myzostomum oblongum Graff, 1883 accepted as Myzostoma oblongum Graff, 1883
97. Species Myzostomum pallidum Graff, 1877 accepted as Myzostoma pallidum Graff, 1877
98. Species Myzostomum parasiticum Leuckart, 1827 accepted as Myzostoma parasiticum Leuckart, 1827 (seems to be a nomen nudum here)
99. Species Myzostomum pentacrini Graff, 1884 accepted as Endomyzostoma pentacrini (Graff, 1884) (unaccepted > superseded combination, Myzostomum was a nomen nudum, and the later Myzostoma is the correct spelling)
100. Species Myzostomum pictum Graff, 1883 (unaccepted)
101. Species Myzostomum platypus Graff, 1887 (unaccepted)
102. Species Myzostomum plicatum Graff, 1884 (unaccepted)
103. Species Myzostomum polycyclus Atkins, 1927 (unaccepted)
104. Species Myzostomum pottsi Atkins, 1927 (unaccepted)
105. Species Myzostomum pseudogigas Jägersten, 1940 (unaccepted)
106. Species Myzostomum pulvinar Graff, 1884 (unaccepted)
107. Species Myzostomum quadricaudatum Graff, 1884 (unaccepted)
108. Species Myzostomum quadrifilum Graff, 1884 (unaccepted)
109. Species Myzostomum radiatum Graff in Clark, 1921 (unaccepted)
110. Species Myzostomum robustum Okada, 1921 (unaccepted)
111. Species Myzostomum rotundum Graff, 1883 (unaccepted)
112. Species Myzostomum rubrofasciatum Graff, 1884 (unaccepted)
113. Species Myzostomum schultzeanum Diesing, 1858 (unaccepted)
114. Species Myzostomum smithi McClendon, 1906 (unaccepted)
115. Species Myzostomum stochoeides Atkins, 1927 (unaccepted)
116. Species Myzostomum striata George, 1943 (unaccepted)
117. Species Myzostomum sulcatum Remscheid, 1918 (unaccepted)
118. Species Myzostomum taeniatum Remscheid, 1918 (unaccepted)
119. Species Myzostomum tentaculatum Jägersten, 1940 (unaccepted)
120. Species Myzostomum tenuispinum Graff, 1884 (unaccepted)
121. Species Myzostomum terminale Jägersten, 1937 (unaccepted)
122. Species Myzostomum testudo Graff, 1883 (unaccepted)
123. Species Myzostomum thompsoni Diesing, 1858 (unaccepted)
124. Species Myzostomum triste Graff, 1887 (unaccepted)
125. Species Myzostomum tuberculatum Jägersten, 1937 (unaccepted)
126. Species Myzostomum tuberculosum Semper, 1859 (unaccepted)
127. Species Myzostomum vastum Graff, 1883 (unaccepted)
128. Species Myzostomum verrucosum Graff, 1877 (unaccepted)
129. Species Myzostomum vincentinum Reichensperger, 1906 (unaccepted)
130. Species Myzostomum viride Atkins, 1927 (unaccepted)
131. Species Myzostomum wheeleri McClendon, 1906 (unaccepted)
132. Species Myzostomum willemoesii Graff, 1884 (unaccepted)
133. Species Myzostomum wyvillethompsoni Graff, 1884 (unaccepted)

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