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

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