1. Species Tetrastemma aberrans Coe, 1901
2. Species Tetrastemma aequicolor Chernyshev, 2024
3. Species Tetrastemma albomaculatum Chernyshev, 2016
4. Species Tetrastemma album Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
5. Species Tetrastemma ambiguum Riches, 1893
6. Species Tetrastemma amphiporoides Bürger, 1893
7. Species Tetrastemma angulatus Senz, 1993
8. Species Tetrastemma antarcticum Bürger, 1893
9. Species Tetrastemma appendiculatum Chernyshev, 1998
10. Species Tetrastemma aseptata (Friedrich, 1935)
11. Species Tetrastemma assimile Örsted, 1844
12. Species Tetrastemma bacescui Müller, 1962
13. Species Tetrastemma baculus (Quatrefages, 1846)
14. Species Tetrastemma basinum Corrêa, 1957
15. Species Tetrastemma beaumonti (Southern, 1913)
16. Species Tetrastemma benedeni Czerniavsky, 1880
17. Species Tetrastemma bicolor Coe, 1901
18. Species Tetrastemma bilineatum Coe, 1904
19. Species Tetrastemma bioculatum Örsted, 1843
20. Species Tetrastemma bistriatum (Timofeeva, 1912)
21. Species Tetrastemma buxeum Bürger, 1895
22. Species Tetrastemma candidum (Müller, 1774)
23. Species Tetrastemma carneum Hookabe, Oya, Tsuchida, Fujiwara & Ueshima, 2023
24. Species Tetrastemma cerasinum Bürger, 1895
25. Species Tetrastemma cincum Corrêa, 1957
26. Species Tetrastemma coronatum (Quatrefages, 1846)
27. Species Tetrastemma cruciatum Bürger, 1895
28. Species Tetrastemma cupido Hookabe, Kohtsuka & Kajihara, 2021
29. Species Tetrastemma diadema Hubrecht, 1879
30. Species Tetrastemma dubium Örsted, 1845
31. Species Tetrastemma duboisi Bürger, 1893
32. Species Tetrastemma dutoiti (Wheeler, 1940)
33. Species Tetrastemma elegans (Girard, 1852)
34. Species Tetrastemma elongatum (Stephenson, 1911)
35. Species Tetrastemma enteroplecta (Corrêa, 1954)
36. Species Tetrastemma falsum Bürger, 1895
37. Species Tetrastemma flavidum Ehrenberg, 1828
38. Species Tetrastemma fozense Gibson & Junoy, 1991
39. Species Tetrastemma freyae Chernyshev, Polyakova, Vignesh, Jain, Sanjeevi, Norenburg & Rajesh, 2020
40. Species Tetrastemma fulvum Kirsteuer, 1963
41. Species Tetrastemma georgianum Bürger, 1893
42. Species Tetrastemma glanduliferum Bürger, 1895
43. Species Tetrastemma hansi Bürger, 1893
44. Species Tetrastemma hermaphroditicum (Keferstein, 1868)
45. Species Tetrastemma herouardi (Oxner, 1908)
46. Species Tetrastemma herthae Corrêa, 1963
47. Species Tetrastemma humile (Quatrefages, 1846)
48. Species Tetrastemma incisum Stimpson, 1855
49. Species Tetrastemma insolens Iwata, 1952
50. Species Tetrastemma interruptum Bürger, 1895
51. Species Tetrastemma jeani McCaul, 1963
52. Species Tetrastemma kangauzi Chernyshev, 2003
53. Species Tetrastemma kefersteinii (Marion, 1869)
54. Species Tetrastemma kirsteueri Senz, 1995
55. Species Tetrastemma knochii (Kölliker, 1845)
56. Species Tetrastemma laminariae Ushakov, 1928
57. Species Tetrastemma leonillae (Oxner, 1908)
58. Species Tetrastemma lilianae Corrêa, 1958
59. Species Tetrastemma longissimum Bürger, 1895
60. Species Tetrastemma longistriatum Wheeler, 1934
61. Species Tetrastemma lophoheliae Bergendal, 1903
62. Species Tetrastemma maivikenensis Wheeler, 1934
63. Species Tetrastemma marionis Joubin, 1890
64. Species Tetrastemma melanocephalum (Johnston, 1837)
65. Species Tetrastemma merula (Corrêa, 1954)
66. Species Tetrastemma microocelli (Sun, 1995)
67. Species Tetrastemma mixtum (Timofeeva, 1912)
68. Species Tetrastemma montagui Senz, 2001
69. Species Tetrastemma nanum Corrêa, 1957
70. Species Tetrastemma nigrifrons Coe, 1904
71. Species Tetrastemma nigrolineatum Wheeler, 1934
72. Species Tetrastemma nimbatum Bürger, 1895
73. Species Tetrastemma oerstedi Senz, 2001
74. Species Tetrastemma olgarum Chernyshev, 1998
75. Species Tetrastemma omicron Joubin, 1902
76. Species Tetrastemma parallelos Abato, Yoshida & Kajihara, 2022
77. Species Tetrastemma persona Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
78. Species Tetrastemma phaeobasisae Kulikova, 1987
79. Species Tetrastemma pimaculatum Chernyshev, 1998
80. Species Tetrastemma pinnatum Iwata, 1954
81. Species Tetrastemma piolinum Corrêa, 1957
82. Species Tetrastemma polyakovae Sagorny, von Döhren, Rouse & Tilic, 2022
83. Species Tetrastemma portus Bürger, 1895
84. Species Tetrastemma primum Corrêa, 1954
85. Species Tetrastemma pseudocoronatum Chernyshev, 1998
86. Species Tetrastemma quadrilineatum Coe, 1904
87. Species Tetrastemma quadristriatum Langerhans, 1880
88. Species Tetrastemma quadristriatum Grube, 1869
89. Species Tetrastemma quatrefagesi (Bürger, 1904)
90. Species Tetrastemma reticulatum Coe, 1904
91. Species Tetrastemma robertianae McIntosh, 1874
92. Species Tetrastemma rollandi Joubin, 1905
93. Species Tetrastemma roseocephalum (Yamaoka, 1947)
94. Species Tetrastemma roseum Verrill, 1892
95. Species Tetrastemma schultzei Czerniavsky, 1880
96. Species Tetrastemma scutelliferum Bürger, 1895
97. Species Tetrastemma sexlineatum Coe, 1940
98. Species Tetrastemma shohoense Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023
99. Species Tetrastemma signifer Coe, 1904
100. Species Tetrastemma simplex (Timofeev, 1911)
101. Species Tetrastemma stanleyi Wheeler, 1934
102. Species Tetrastemma stimpsoni Chernyshev, 1992
103. Species Tetrastemma strandae Sagorny, von Döhren, Rouse & Tilic, 2022
104. Species Tetrastemma subpellucidum Örsted, 1843
105. Species Tetrastemma suhmi (Bürger, 1904)
106. Species Tetrastemma sundbergi Sagorny, von Döhren, Rouse & Tilic, 2022
107. Species Tetrastemma tanikelyensis Kirsteuer, 1965
108. Species Tetrastemma timofeevai Gibson, 1995
109. Species Tetrastemma tristibruna Sundberg & Gibson, 1995
110. Species Tetrastemma turdum Corrêa, 1957
111. Species Tetrastemma tutus (Monastero, 1930)
112. Species Tetrastemma unicolor (Hubrecht, 1879)
113. Species Tetrastemma vastum Bürger, 1895
114. Species Tetrastemma verinigrum Iwata, 1954
115. Species Tetrastemma vermiculus (Quatrefages, 1846)
116. Species Tetrastemma verrilli (Bürger, 1904)
117. Species Tetrastemma viera (Timofeev, 1911)
118. Species Tetrastemma viperula (Timofeev, 1911)
119. Species Tetrastemma virgatum Kirsteuer, 1963
120. Species Tetrastemma vittigerum (Bürger, 1904)
121. Species Tetrastemma weddelli Wheeler, 1934
122. Species Tetrastemma wilsoni Coe, 1943
123. Species Tetrastemma worki Corrêa, 1961
124. Species Tetrastemma albicollis Ushakov, 1928 accepted as Amphiporus superbus (Girard in Stimpson, 1854) (synonym)
125. Species Tetrastemma albidum Coe, 1905 accepted as Prosorhochmus albidus (Coe, 1905) (synonym)
126. Species Tetrastemma algae (Dalyell, 1853) accepted as Tetrastemma candidum (Müller, 1774) (synonym)
127. Species Tetrastemma arctica Ushakov, 1926 accepted as Arctostemma arcticum (Ushakov, 1926) (unaccepted > superseded combination)
128. Species Tetrastemma belgicae Bürger, 1904 accepted as Antarctonemertes belgica (Bürger, 1904) (synonym)
129. Species Tetrastemma caecum Coe, 1901 accepted as Amphinemertes caeca (Coe, 1901) (synonym)
130. Species Tetrastemma cruciatus sensu Senz, 1993 accepted as Tetrastemma kirsteueri Senz, 1995 (synonym)
131. Species Tetrastemma flagellatum Montgomery, 1897 accepted as Tetrastemma vermiculus (Quatrefages, 1846) (synonym)
132. Species Tetrastemma flavida McIntosh, 1873-1874 accepted as Nemertopsis flavida (McIntosh, 1873-1874) (synonym)
133. Species Tetrastemma fozensis Gibson & Junoy, 1991 accepted as Tetrastemma fozense Gibson & Junoy, 1991 (unaccepted > incorrect grammatical agreement of specific epithet)
134. Species Tetrastemma glandulidorsum Müller, 1976 (unaccepted > nomen nudum, No description, lapsus calami for Tetrastemma glanduliferum?)
135. Species Tetrastemma groenlandicum Diesing, 1850 accepted as Tetrastemma candidum (Müller, 1774) (unaccepted > junior subjective synonym)
136. Species Tetrastemma hermaphroditica (Keferstein, 1868) accepted as Tetrastemma hermaphroditicum (Keferstein, 1868) (unaccepted > misspelling - incorrect subsequent spelling)
137. Species Tetrastemma humilis (Quatrefages, 1846) accepted as Tetrastemma humile (Quatrefages, 1846) (unaccepted > incorrect grammatical agreement of specific epithet)
138. Species Tetrastemma immutabile Riches, 1893 accepted as Oerstedia immutabilis (Riches, 1893) (synonym)
139. Species Tetrastemma longicapitatum Orsted, 1845 accepted as Tetrastemma flavidum Ehrenberg, 1828 (synonym)
140. Species Tetrastemma longicapitatum Örsted, 1845 accepted as Tetrastemma flavidum Ehrenberg, 1828 (unaccepted > junior subjective synonym)
141. Species Tetrastemma maculatum Sumner, 1894 accepted as Oerstedia nigra (Riches, 1893) (synonym)
142. Species Tetrastemma minuta (Friedrich, 1935) accepted as Paraminutanemertes minuta (Friedrich, 1935) (unaccepted > superseded combination)
143. Species Tetrastemma nigra Riches, 1893 accepted as Oerstedia nigra (Riches, 1893) (Synonym)
144. Species Tetrastemma nigrum Riches, 1893 accepted as Oerstedia nigra (Riches, 1893) (synonym)
145. Species Tetrastemma obscurum Schultze, 1851 accepted as Cyanophthalma obscura (Schultze, 1851) (synonym)
146. Species Tetrastemma papilliformis Korotkevich, 1977 accepted as Kurilonemertes papilliformis (Korotkevich, 1977) (unaccepted > superseded combination)
147. Species Tetrastemma phyllospadicola Stricker, 1985 accepted as Antarctonemertes phyllospadicola (Stricker, 1985) accepted as Kurilonemertes phyllospadicola (Stricker, 1985) (synonym)
148. Species Tetrastemma quasioculata Korotkevich, 1977 accepted as Kurilonemertes papilliformis (Korotkevich, 1977) (unaccepted > junior subjective synonym)
149. Species Tetrastemma rufescens Örsted, 1843 accepted as Tetrastemma coronatum (Quatrefages, 1846) (synonym)
150. Species Tetrastemma rustica Joubin, 1890 accepted as Oerstedia rustica (Joubin, 1890) (synonym)
151. Species Tetrastemma rusticum Joubin, 1890 accepted as Oerstedia rustica (Joubin, 1890) (Synonym)
152. Species Tetrastemma serpentina Girard, 1851 accepted as Tetrastemma candidum (Müller, 1774) (unaccepted > junior subjective synonym)
153. Species Tetrastemma stigmatum (sensu Yamaoka, 1940) accepted as Tetrastemma stimpsoni Chernyshev, 1992 (synonym)
154. Species Tetrastemma unilineatum Joubin, 1910 accepted as Antarctonemertes unilineata (Joubin, 1910) (synonym)
155. Species Tetrastemma viride Kulikova, 1989 accepted as Protetrastemma viride (Kulikova, 1989) (unaccepted > superseded combination)
156. Species Tetrastemma vittata Verrill, 1874 accepted as Cyanophthalma vittata (Verrill, 1874) (unaccepted > junior subjective synonym)
157. Species Tetrastemma vittatum (Hubrecht, 1879) sensu Bürger, 1895 accepted as Tetrastemma vittigerum (Bürger, 1904) (synonym)
158. Species Tetrastemma yamaokai Iwata, 1954 accepted as Tetrastemma roseocephalum (Yamaoka, 1947) (Junior Synonym)
159. Species Tetrastemma albolineatum (Timofeeva, 1912) (uncertain > nomen dubium)
160. Species Tetrastemma bipeltatum (Timofeeva, 1912) (uncertain > nomen dubium)
161. Species Tetrastemma brunnea (Friedrich, 1935) (uncertain > nomen dubium)
162. Species Tetrastemma capitatum Lebedinsky, 1889 (uncertain > nomen dubium)
163. Species Tetrastemma cassidens (Marenzeller, 1886) (uncertain > nomen dubium)
164. Species Tetrastemma cephalophorum Bürger, 1895 (uncertain > nomen dubium)
165. Species Tetrastemma graeffei (Diesing, 1863) (uncertain > nomen dubium)
166. Species Tetrastemma helvolum Bürger, 1895 (uncertain > nomen dubium)
167. Species Tetrastemma peltatum Bürger, 1895 (uncertain > nomen dubium)
168. Species Tetrastemma stigmatum Stimpson, 1857 (uncertain > nomen dubium)
169. Species Tetrastemma tridentata accepted as Tetrastemma tridentatum Korotkevich, 1977 (uncertain > nomen dubium, synonym)
170. Species Tetrastemma tridentatum Korotkevich, 1977 (uncertain > nomen dubium)

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