1. Species Tetrastemma aberrans Coe, 1901
2. Species Tetrastemma albomaculatum Chernyshev, 2016
3. Species Tetrastemma album Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
4. Species Tetrastemma ambiguum Riches, 1893
5. Species Tetrastemma amphiporoides Bürger, 1893
6. Species Tetrastemma angulatus Senz, 1993
7. Species Tetrastemma antarcticum Bürger, 1893
8. Species Tetrastemma appendiculatum Chernyshev, 1998
9. Species Tetrastemma aseptata (Friedrich, 1935)
10. Species Tetrastemma assimile Örsted, 1844
11. Species Tetrastemma bacescui Müller, 1962
12. Species Tetrastemma baculus (Quatrefages, 1846)
13. Species Tetrastemma basinum Corrêa, 1957
14. Species Tetrastemma beaumonti (Southern, 1913)
15. Species Tetrastemma benedeni Czerniavsky, 1880
16. Species Tetrastemma bicolor Coe, 1901
17. Species Tetrastemma bilineatum Coe, 1904
18. Species Tetrastemma bioculatum Örsted, 1843
19. Species Tetrastemma bistriatum (Timofeeva, 1912)
20. Species Tetrastemma buxeum Bürger, 1895
21. Species Tetrastemma candidum (Müller, 1774)
22. Species Tetrastemma carneum Hookabe, Oya, Tsuchida, Fujiwara & Ueshima, 2023
23. Species Tetrastemma cerasinum Bürger, 1895
24. Species Tetrastemma cincum Corrêa, 1957
25. Species Tetrastemma coronatum (Quatrefages, 1846)
26. Species Tetrastemma cruciatum Bürger, 1895
27. Species Tetrastemma cupido Hookabe, Kohtsuka & Kajihara, 2021
28. Species Tetrastemma diadema Hubrecht, 1879
29. Species Tetrastemma dubium Örsted, 1845
30. Species Tetrastemma duboisi Bürger, 1893
31. Species Tetrastemma dutoiti (Wheeler, 1940)
32. Species Tetrastemma elegans (Girard, 1852)
33. Species Tetrastemma enteroplecta (Corrêa, 1954)
34. Species Tetrastemma falsum Bürger, 1895
35. Species Tetrastemma flavidum Ehrenberg, 1828
36. Species Tetrastemma fozense Gibson & Junoy, 1991
37. Species Tetrastemma fulvum Kirsteuer, 1963
38. Species Tetrastemma georgianum Bürger, 1893
39. Species Tetrastemma glanduliferum Bürger, 1895
40. Species Tetrastemma hansi Bürger, 1893
41. Species Tetrastemma hermaphroditica (Keferstein, 1868)
42. Species Tetrastemma herouardi (Oxner, 1908)
43. Species Tetrastemma herthae Corrêa, 1963
44. Species Tetrastemma humilis (Quatrefages, 1846)
45. Species Tetrastemma incisum Stimpson, 1855
46. Species Tetrastemma insolens Iwata, 1952
47. Species Tetrastemma interruptum Bürger, 1895
48. Species Tetrastemma jeani McCaul, 1963
49. Species Tetrastemma kangauzi Chernyshev, 2003
50. Species Tetrastemma kefersteinii (Marion, 1869)
51. Species Tetrastemma kirsteueri Senz, 1995
52. Species Tetrastemma knochii (Kölliker, 1845)
53. Species Tetrastemma laminariae Ushakov, 1928
54. Species Tetrastemma leonillae (Oxner, 1908)
55. Species Tetrastemma lilianae Corrêa, 1958
56. Species Tetrastemma longissimum Bürger, 1895
57. Species Tetrastemma longistriatum Wheeler, 1934
58. Species Tetrastemma lophoheliae Bergendal, 1903
59. Species Tetrastemma maivikenensis Wheeler, 1934
60. Species Tetrastemma marionis Joubin, 1890
61. Species Tetrastemma melanocephalum (Johnston, 1837)
62. Species Tetrastemma merula (Corrêa, 1954)
63. Species Tetrastemma mixtum (Timofeeva, 1912)
64. Species Tetrastemma montagui Senz, 2001
65. Species Tetrastemma nanum Corrêa, 1957
66. Species Tetrastemma nigrifrons (Coe, 1904)
67. Species Tetrastemma nigrolineatum Wheeler, 1934
68. Species Tetrastemma nimbatum Bürger, 1895
69. Species Tetrastemma oerstedi Senz, 2001
70. Species Tetrastemma olgarum Chernyshev, 1998
71. Species Tetrastemma omicron Joubin, 1902
72. Species Tetrastemma parallelos Abato, Yoshida & Kajihara, 2022
73. Species Tetrastemma persona Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
74. Species Tetrastemma phaeobasisae Kulikova, 1987
75. Species Tetrastemma pimaculatum Chernyshev, 1998
76. Species Tetrastemma pinnatum Iwata, 1954
77. Species Tetrastemma piolinum Corrêa, 1957
78. Species Tetrastemma polyakovae Sagorny, von Döhren, Rouse & Tilic, 2022
79. Species Tetrastemma portus Bürger, 1895
80. Species Tetrastemma primum Corrêa, 1954
81. Species Tetrastemma pseudocoronatum Chernyshev, 1998
82. Species Tetrastemma quadrilineatum Coe, 1904
83. Species Tetrastemma quadristriatum Langerhans, 1880
84. Species Tetrastemma quadristriatum Grube, 1869
85. Species Tetrastemma quatrefagesi (Bürger, 1904)
86. Species Tetrastemma reticulatum Coe, 1904
87. Species Tetrastemma robertianae McIntosh, 1874
88. Species Tetrastemma rollandi Joubin, 1905
89. Species Tetrastemma roseocephalum (Yamaoka, 1947)
90. Species Tetrastemma roseum Verrill, 1892
91. Species Tetrastemma schultzei Czerniavsky, 1880
92. Species Tetrastemma scutelliferum Bürger, 1895
93. Species Tetrastemma sexlineatum Coe, 1940
94. Species Tetrastemma shohoense Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
95. Species Tetrastemma signifer Coe, 1904
96. Species Tetrastemma simplex (Timofeev, 1911)
97. Species Tetrastemma stanleyi Wheeler, 1934
98. Species Tetrastemma stigmatum Stimpson, 1857
99. Species Tetrastemma stimpsoni Chernyshev, 1992
100. Species Tetrastemma strandae Sagorny, von Döhren, Rouse & Tilic, 2022
101. Species Tetrastemma subpellucidum Ørsted, 1843
102. Species Tetrastemma suhmi (Bürger, 1904)
103. Species Tetrastemma sundbergi Sagorny, von Döhren, Rouse & Tilic, 2022
104. Species Tetrastemma tanikelyensis Kirsteuer, 1965
105. Species Tetrastemma timofeevai Gibson, 1995
106. Species Tetrastemma tristibruna Sundberg & Gibson, 1995
107. Species Tetrastemma turdum Corrêa, 1957
108. Species Tetrastemma tutus (Monastero, 1930)
109. Species Tetrastemma unicolor (Hubrecht, 1879)
110. Species Tetrastemma vastum Bürger, 1895
111. Species Tetrastemma verinigrum Iwata, 1954
112. Species Tetrastemma vermiculus (Quatrefages, 1846)
113. Species Tetrastemma verrilli (Bürger, 1904)
114. Species Tetrastemma viera (Timofeev, 1911)
115. Species Tetrastemma viperula (Timofeev, 1911)
116. Species Tetrastemma virgatum Kirsteuer, 1963
117. Species Tetrastemma vittigerum (Bürger, 1904)
118. Species Tetrastemma weddelli Wheeler, 1934
119. Species Tetrastemma wilsoni Coe, 1943
120. Species Tetrastemma worki Corrêa, 1961
121. Species Tetrastemma albicollis Ushakov, 1928 accepted as Amphiporus superbus (Girard in Stimpson, 1854) (synonym)
122. Species Tetrastemma albidum Coe, 1905 accepted as Prosorhochmus albidus (Coe, 1905) (synonym)
123. Species Tetrastemma algae (Dalyell, 1853) accepted as Tetrastemma candidum (Müller, 1774) (synonym)
124. Species Tetrastemma arctica Ushakov, 1926 accepted as Arctostemma arcticum (Ushakov, 1926) (unaccepted > superseded combination)
125. Species Tetrastemma belgicae Bürger, 1904 accepted as Antarctonemertes belgica (Bürger, 1904) (synonym)
126. Species Tetrastemma caecum Coe, 1901 accepted as Amphinemertes caeca (Coe, 1901) (synonym)
127. Species Tetrastemma cruciatus sensu Senz, 1993 accepted as Tetrastemma kirsteueri Senz, 1995 (synonym)
128. Species Tetrastemma flavida McIntosh, 1873-1874 accepted as Nemertopsis flavida (McIntosh, 1873-1874) (synonym)
129. Species Tetrastemma fozensis Gibson & Junoy, 1991 accepted as Tetrastemma fozense Gibson & Junoy, 1991 (unaccepted > incorrect grammatical agreement of specific epithet)
130. Species Tetrastemma glandulidorsum Müller, 1976 (unaccepted > nomen nudum, No description, lapsus calami for Tetrastemma glanduliferum?)
131. Species Tetrastemma immutabile Riches, 1893 accepted as Oerstedia immutabilis (Riches, 1893) (synonym)
132. Species Tetrastemma longicapitatum Orsted, 1845 accepted as Tetrastemma flavidum Ehrenberg, 1828 (synonym)
133. Species Tetrastemma maculatum Sumner, 1894 accepted as Oerstedia nigra (Riches, 1893) (synonym)
134. Species Tetrastemma minuta Friedrich, 1935 accepted as Paraminutanemertes minutus (Friedrich, 1935) (synonym)
135. Species Tetrastemma nigra Riches, 1893 accepted as Oerstedia nigra (Riches, 1893) (Synonym)
136. Species Tetrastemma nigrum Riches, 1893 accepted as Oerstedia nigra (Riches, 1893) (synonym)
137. Species Tetrastemma obscurum Schultze, 1851 accepted as Cyanophthalma obscura (Schultze, 1851) (synonym)
138. Species Tetrastemma papilliformis Korotkevich, 1977 accepted as Antarctonemertes papilliformis (Korotkevich, 1977) accepted as Kurilonemertes papilliformes (Korotkevich, 1977) (synonym)
139. Species Tetrastemma phyllospadicola Stricker, 1985 accepted as Antarctonemertes phyllospadicola (Stricker, 1985) accepted as Kurilonemertes phyllospadicola (Stricker, 1985) (synonym)
140. Species Tetrastemma quasioculata Korotkevich, 1977 accepted as Antarctonemertes papilliformis (Korotkevich, 1977) accepted as Kurilonemertes papilliformes (Korotkevich, 1977) (synonym)
141. Species Tetrastemma rufescens Orsted, 1843 accepted as Tetrastemma coronatum (Quatrefages, 1846) (synonym)
142. Species Tetrastemma rustica Joubin, 1890 accepted as Oerstedia rustica (Joubin, 1890) (synonym)
143. Species Tetrastemma rusticum Joubin, 1890 accepted as Oerstedia rustica (Joubin, 1890) (Synonym)
144. Species Tetrastemma unilineatum Joubin, 1910 accepted as Antarctonemertes unilineata (Joubin, 1910) (synonym)
145. Species Tetrastemma viride Kulikova, 1989 accepted as Protetrastemma viride (Kulikova, 1989) (unaccepted > superseded combination)
146. Species Tetrastemma vittata Verrill, 1874 accepted as Cyanophthalma vittata (Verrill, 1874) (unaccepted > junior subjective synonym)
147. Species Tetrastemma vittatum (Hubrecht, 1879) sensu Bürger, 1895 accepted as Tetrastemma vittigerum (Bürger, 1904) (synonym)
148. Species Tetrastemma yamaokai Iwata, 1954 accepted as Tetrastemma roseocephalum (Yamaoka, 1947) (Junior Synonym)
149. Species Tetrastemma albolineatum (Timofeeva, 1912) (uncertain > nomen dubium)
150. Species Tetrastemma bipeltatum (Timofeeva, 1912) (uncertain > nomen dubium)
151. Species Tetrastemma brunnea (Friedrich, 1935) (uncertain > nomen dubium)
152. Species Tetrastemma cassidens (Marenzeller, 1886) (uncertain > nomen dubium)
153. Species Tetrastemma cephalophorum Bürger, 1895 (uncertain > nomen dubium)
154. Species Tetrastemma graeffei (Diesing, 1863) (uncertain > nomen dubium)
155. Species Tetrastemma helvolum Bürger, 1895 (uncertain > nomen dubium)
156. Species Tetrastemma peltatum Bürger, 1895 (uncertain > nomen dubium)
157. Species Tetrastemma tridentata accepted as Tetrastemma tridentatum Korotkevich, 1977 (uncertain > nomen dubium, synonym)
158. Species Tetrastemma tridentatum Korotkevich, 1977 (uncertain > nomen dubium)

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