1. Species Halymenia abyssicola E.Y.Dawson, 1944
2. Species Halymenia actinophysa M.A.Howe, 1911
3. Species Halymenia angusta (J.Agardh) De Toni, 1905
4. Species Halymenia arachnophylloidea Weber-van Bosse, 1921
5. Species Halymenia asymmetrica Gargiulo, Masi & Tripodi, 1986
6. Species Halymenia ballesterosii Rodríguez-Prieto, Showe M.Lin, De Clerck & Huisman, 2020
7. Species Halymenia bifida E.Y.Dawson, 1954
8. Species Halymenia botryoides Richard, 1834
9. Species Halymenia brasiliana S.M.P.B.Guimarães & M.T.Fujii, 1998
10. Species Halymenia bullosa (Harvey) Huisman, Rodríguez-Prieto & Showe M.Lin, 2022
11. Species Halymenia californica G.M.Smith & Hollenberg, 1943
12. Species Halymenia carnosa
13. Species Halymenia cearensis C.A.A.Azevedo, Cassano & M.C.Oliveira, 2016
14. Species Halymenia cerratei C.O.Acleto, 1973
15. Species Halymenia chiangiana I.A.Abbott & Kraft, 1997
16. Species Halymenia clathrata E.C.Oliveira, Pinheiro-Vieira & R.E.Norris, 1976
17. Species Halymenia claviformis Suhr, 1831
18. Species Halymenia corinaldii Meneghini, 1844
19. Species Halymenia cromwellii I.A.Abbott, 1998
20. Species Halymenia dilatata Zanardini, 1851
21. Species Halymenia dubia Bory de Saint-Vincent, 1834
22. Species Halymenia duchassaingii (J.Agardh) Kylin, 1932
23. Species Halymenia durvillei Bory de Saint-Vincent, 1828
24. Species Halymenia echinophysa Collins & M.Howe, 1916
25. Species Halymenia elongata C.Agardh, 1822
26. Species Halymenia fasciata Bory de Saint-Vincent
27. Species Halymenia flabellata F.Schmitz, 1895
28. Species Halymenia floresii (Clemente) C.Agardh, 1817
29. Species Halymenia foliacea W.R.Taylor, 1947
30. Species Halymenia formosa Harvey ex Kützing, 1866
31. Species Halymenia gardneri (Kylin) P.G.Parkinson, 1980
32. Species Halymenia hancockii W.R.Taylor, 1942
33. Species Halymenia harveyana J.Agardh, 1892
34. Species Halymenia hawaiiana Hernández-Kantun & A.R.Sherwood, 2012
35. Species Halymenia hollenbergii I.A.Abbott, 1967
36. Species Halymenia hvarii Ercegovic, 1963
37. Species Halymenia ignifera C.A.A.Azevedo, Cassano & M.C.Oliveira, 2016
38. Species Halymenia imbricata Dickie, 1887
39. Species Halymenia integra Howe & Taylor, 1932
40. Species Halymenia jelinekii Grunow, 1868
41. Species Halymenia jensenii Weber-van Bosse, 1926
42. Species Halymenia kraftii Womersley & J.A.Lewis, 1994
43. Species Halymenia kuetzingii A.J.K.Millar, 2005
44. Species Halymenia lacerata Sonder, 1871
45. Species Halymenia maculata J.Agardh, 1885
46. Species Halymenia malaysiana P.-L.Tan, P.-E.Lim, Showe M.Lin & S.-M.Phang, 2018
47. Species Halymenia megaspora E.Y.Dawson, 1954
48. Species Halymenia microcarpa (Montagne) P.C.Silva, 1987
49. Species Halymenia mirabilis D.L.Ballantine & H.Ruiz, 2004
50. Species Halymenia muelleri Sonder, 1853
51. Species Halymenia naegelii Kützing, 1849
52. Species Halymenia nukuhivensis N'Yuert & Payri, 2009
53. Species Halymenia pinnatifida C.A.A.Azevedo, Cassano & M.C.Oliveira, 2016
54. Species Halymenia plana Zanardini, 1874
55. Species Halymenia platycarpa (Harvey ex Grunow) J.Agardh, 1876
56. Species Halymenia pluriloba Ercegovic, 1949
57. Species Halymenia polyclada A.Gepp & E.S.Gepp, 1905
58. Species Halymenia porphyraeformis Parkinson, 1980
59. Species Halymenia porphyroides Børgesen, 1932
60. Species Halymenia pseudofloresii Collins & M.Howe, 1916
61. Species Halymenia purpurascens
62. Species Halymenia pusilla Sonder, 1845
63. Species Halymenia refugiensis E.Y.Dawson, 1944
64. Species Halymenia rhodymenioides Ercegovic, 1949
65. Species Halymenia rosea M.A.Howe & W.R.Taylor, 1931
66. Species Halymenia santamariae W.R.Taylor, 1945
67. Species Halymenia schizymenioides Hollenberg & I.A.Abbott, 1965
68. Species Halymenia silviae C.A.A.Azevedo, Cassano & M.C.Oliveira, 2016
69. Species Halymenia stipitata I.A.Abbott, 1998
70. Species Halymenia tenera M.Howe, 1914
71. Species Halymenia tenuispina Kützing, 1867
72. Species Halymenia tondoana O.DeClerck & Hernández-Kantun, 2012
73. Species Halymenia utriana W.R.Taylor, 1945
74. Species Halymenia venusta Børgesen, 1932
75. Species Halymenia vinacea M.A.Howe & W.R.Taylor, 1931
76. Species Halymenia lubrica Suhr, 1834 (uncertain)
77. Species Halymenia montagnei (Bory) Bertoloni, 1862 (uncertain, uncertain taxonomic status subjected to verification)
78. Species Halymenia multifida Zanardini, 1874 (uncertain)
79. Species Halymenia proteus (Delile) Sprengel, 1827 (uncertain, uncertain taxonomic status subjected to verification)
80. Species Halymenia ramosissima Suhr, 1840 (uncertain, uncertain taxonomic status subjected to verification)
81. Species Halymenia acuminata (Holmes) J.Agardh, 1901 accepted as Grateloupia acuminata Holmes, 1896 (synonym)
82. Species Halymenia agardhii De Toni, 1905 accepted as Sebdenia flabellata (J.Agardh) P.G.Parkinson, 1980
83. Species Halymenia algeriensis Montagne, 1838 accepted as Chrysymenia pinnulata (C.Agardh) J.Agardh, 1842 accepted as Chrysymenia ventricosa (J.V.Lamouroux) J.Agardh, 1842
84. Species Halymenia amoena Bory de Saint-Vincent, 1834 accepted as Sebdenia amoena (Bory) E.Soler-Onís, 1998
85. Species Halymenia australis (Sonder) Sonder, 1848 accepted as Nizymenia conferta (Sonder) Chiovitti, G.W.Saunders & Kraft, 1995
86. Species Halymenia bermudensis Collins & M.Howe, 1916 accepted as Cryptonemia bermudensis (Collins & M.Howe) C.W.Schneider, C.E.Lane & G.W.Saunders, 2018 (synonym)
87. Species Halymenia brodiei (Turner) Lamouroux, 1824 accepted as Coccotylus brodiei (Turner) Kützing, 1843 (synonym)
88. Species Halymenia calvadosii (J.V.Lamouroux ex Duby) Montagne, 1836 accepted as Helminthocladia calvadosii (J.V.Lamouroux ex Duby) Setchell, 1915 (synonym)
89. Species Halymenia cavernicola Giaccone, 1968 accepted as Halymenia elongata C.Agardh, 1822
90. Species Halymenia cervicornis J.Agardh, 1842 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894 (synonym)
91. Species Halymenia ceylanica Harvey ex Kützing, 1866 accepted as Halymenia microcarpa (Montagne) P.C.Silva, 1987
92. Species Halymenia chondricola Sonder, 1845 accepted as Hymenocladia chondricola (Sonder) J.A.Lewis, 1994
93. Species Halymenia chondriopsidea J.Agardh, 1892 accepted as Zymurgia chondriopsidea (J.Agardh) J.A.Lewis & Kraft, 1992
94. Species Halymenia cliftonii Harvey, 1859 accepted as Cryptonemia kallymenioides (Harvey) Kraft, 1982 (synonym)
95. Species Halymenia coccinea (Harvey) I.A.Abbott, 1967 accepted as Weeksia coccinea (Harvey) S.C.Lindstrom, 1986
96. Species Halymenia cordata (Turner) C.Agardh, 1822 accepted as Iridaea cordata (Turner) Bory, 1826 (synonym)
97. Species Halymenia cyclocolpa Montagne, 1841 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894
98. Species Halymenia decipiens J.Agardh, 1851 accepted as Halymenia elongata var. decipiens (J.Agardh) Cremades, 1990 (synonym)
99. Species Halymenia dentata Suhr, 1834 accepted as Sarcodia dentata (Suhr) R.E.Norris ex M.J.Wynne, 1989
100. Species Halymenia dichotoma (J.Agardh) J.Agardh, 1876 accepted as Sebdenia dichotoma Berthold, 1884 (synonym)
101. Species Halymenia dichotoma (J.Agardh) Montagne, 1846 accepted as Nemastoma dichotomum J.Agardh, 1842 (synonym)
102. Species Halymenia digitata J.Agardh, 1892 accepted as Cryptonemia digitata (J.Agardh) Womersley & J.A.Lewis, 1994
103. Species Halymenia doryphora Montagne, 1839 accepted as Grateloupia doryphora (Montagne) M.Howe, 1914
104. Species Halymenia dubyi Chauvin ex Duby, 1830 accepted as Schizymenia dubyi (Chauvin ex Duby) J.Agardh, 1851
105. Species Halymenia durvillaei accepted as Halymenia durvillei Bory de Saint-Vincent, 1828
106. Species Halymenia edulis (Stackhouse) C.Agardh, 1822 accepted as Dilsea carnosa (Schmidel) Kuntze, 1898
107. Species Halymenia elongata Kützing, 1849 accepted as Halymenia lapathifolia Kützing, 1866 accepted as Mariaramirezia lapathifolia (Kützing) Molinari & Guiry, 2021
108. Species Halymenia fastigiata J.Agardh, 1849 accepted as Halymenia elongata C.Agardh, 1822 (synonym)
109. Species Halymenia fastigiata Bory de Saint-Vincent, 1825 accepted as Nothogenia fastigiata (Bory) P.G.Parkinson, 1983
110. Species Halymenia filiformis (Hornemann) C.Agardh, 1822 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
111. Species Halymenia fimbriata (Zanardini) Aleem, 1993 accepted as Halymenia durvillei var. fimbriata Zanardini (synonym)
112. Species Halymenia fimbriata Zanardini, 1874 accepted as Sarcodia ciliata Zanardini, 1874
113. Species Halymenia floresia (Clemente) C. Agardh, 1807 accepted as Halymenia floresii (Clemente) C.Agardh, 1817
114. Species Halymenia floridana J.Agardh, 1892 accepted as Cryptonemia floridana (J.Agardh) J.P.Soares, T.Sauvage et M.T.Fujii, 2024
115. Species Halymenia foeniculacea (Hudson) C.Agardh, 1817 accepted as Dictyosiphon foeniculaceus (Hudson) Greville, 1830
116. Species Halymenia furcellata (Turner) C.Agardh, 1821 accepted as Scinaia furcellata (Turner) J.Agardh, 1851
117. Species Halymenia gelinaria F.S.Collins & M.A.Howe, 1916 accepted as Halymenia floridana J.Agardh, 1892 accepted as Cryptonemia floridana (J.Agardh) J.P.Soares, T.Sauvage et M.T.Fujii, 2024 (synonym)
118. Species Halymenia gmelinii Duby, 1830 accepted as Cryptonemia palmetta (S.G.Gmelin) Woelkering, G.Furnari, Cormaci & McNeill, 2019 (synonym)
119. Species Halymenia graminifolia (Lepechin) Steudel, 1824 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982 (synonym)
120. Species Halymenia hakalauensis Tilden, 1894 accepted as Polyopes hakalauensis (Tilden) I.A.Abbott, 1998
121. Species Halymenia heterocarpa Chuvin ex Duby, 1830 accepted as Drachiella heterocarpa (Chauvin ex Duby) Maggs & Hommersand, 1993
122. Species Halymenia incrustans J.Agardh, 1885 accepted as Titanophora incrustans (J.Agardh) Børgesen, 1949
123. Species Halymenia incurvata Suhr, 1839 accepted as Durvillaea antarctica (Chamisso) Hariot, 1892 (synonym)
124. Species Halymenia iyoensis Yagi, 1938 accepted as Galene rotunda (Okamura) D'Archino & Zuccarello, 2014
125. Species Halymenia kallymenioides Harvey, 1855 accepted as Cryptonemia kallymenioides (Harvey) Kraft, 1982
126. Species Halymenia lacera (J.V.Lamouroux) J.V.Lamouroux, 1824 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805 (synonym)
127. Species Halymenia lanceola J.Agardh, 1841 accepted as Grateloupia doryphora (Montagne) M.Howe, 1914
128. Species Halymenia lapathifolia Kützing, 1866 accepted as Mariaramirezia lapathifolia (Kützing) Molinari & Guiry, 2021 (synonym)
129. Species Halymenia latifolia P.Crouan & H.Crouan ex Kützing, 1866 accepted as Nesoia latifolia (P.Crouan & H.Crouan ex Kützing) H.W.Lee & M.S.Kim, 2019
130. Species Halymenia latissima J.D.Hooker & Harvey, 1845 accepted as Iridaea latissima (J.D.Hooker & Harvey) Grunow, 1867
131. Species Halymenia leiphaemia Montagne, 1837 accepted as Delesseria leiphaemia (Montagne) M.Howe, 1914 (synonym)
132. Species Halymenia ligulata (Woodward) C.Agardh, 1822 accepted as Halarachnion ligulatum (Woodward) Kützing, 1843 (synonym)
133. Species Halymenia limensis (Kützing) Sonder, 1866 accepted as Cryptonemia limensis (Kützing) J.A.Lewis, 1990 (synonym)
134. Species Halymenia lobata Meneghini, 1841 accepted as Chondrymenia lobata (Meneghini) Zanardini, 1860 (synonym)
135. Species Halymenia marginata Rousell, 1838 accepted as Felicinia marginata (Roussel) Manghisi, Le Gall, Ribera, Gargiulo & Morabito, 2014
136. Species Halymenia membranacea Harvey, 1844 accepted as Rhodophyllis membranacea (Harvey) J.D.Hooker & Harvey, 1855
137. Species Halymenia monardiana Montagne, 1838 accepted as Sebdenia monardiana (Montagne) Berthold, 1882
138. Species Halymenia mucosa Ercegovic, 1949 accepted as Sebdenia rodrigueziana (Feldmann) Codomier ex Parkinson, 1980 (synonym)
139. Species Halymenia multifida J.Agardh, 1841 accepted as Nemastoma multifidum (J.Agardh) J.Agardh, 1851 (synonym)
140. Species Halymenia nicaeensis J.V.Lamouroux ex Duby, 1830 accepted as Schottera nicaeensis (J.V.Lamouroux ex Duby) Guiry & Hollenberg, 1975 (synonym)
141. Species Halymenia novae-zelandiae Montagne, 1845 accepted as Grateloupia urvilleana (Montagne) P.G.Parkinson, 1974
142. Species Halymenia palmata (Linnaeus) C.Agardh, 1817 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805
143. Species Halymenia palmetta (Stackhouse) J.V.Lamouroux, 1824 accepted as Rhodymenia pseudopalmata (J.V.Lamouroux) P.C.Silva, 1952
144. Species Halymenia patens J.Agardh, 1851 accepted as Kallymenia patens (J.Agardh) Codomier ex P.G.Parkinson, 1980 (synonym)
145. Species Halymenia pennata P.L.Crouan & H.M.Crouan, 1865 accepted as Agardhiella ramosissima (Harvey) Kylin, 1932
146. Species Halymenia pickeana (Dickie) J.Agardh, 1885 accepted as Titanophora pikeana (Dickie) Feldmann, 1942
147. Species Halymenia pinnulata C.Agardh, 1827 accepted as Chrysymenia pinnulata (C.Agardh) J.Agardh, 1842 accepted as Chrysymenia ventricosa (J.V.Lamouroux) J.Agardh, 1842
148. Species Halymenia platyna C.Agardh, 1822 accepted as Iridaea platyna (C.Agardh) Postels & Ruprecht, 1840
149. Species Halymenia platynus C.Agardh, 1822 accepted as Chondrus platynus (C.Agardh) Ruprecht, 1850 (synonym)
150. Species Halymenia pluribola Ercegovic accepted as Halymenia pluriloba Ercegovic, 1949
151. Species Halymenia polydactyla Børgesen, 1932 accepted as Sebdenia flabellata (J.Agardh) P.G.Parkinson, 1980
152. Species Halymenia ramentacea (Linnaeus) C.Agardh, 1817 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
153. Species Halymenia reniformis (Turner) C.Agardh, 1822 accepted as Kallymenia reniformis (Turner) J.Agardh, 1842 (synonym)
154. Species Halymenia reptans Suhr, 1834 accepted as Rhodophyllis reptans (Suhr) Papenfuss, 1956
155. Species Halymenia rodrigueziana Feldmann, 1935 accepted as Sebdenia rodrigueziana (Feldmann) Codomier ex Parkinson, 1980
156. Species Halymenia rosacea J.Agardh, 1868 accepted as Turnerella pennyi (Harvey) F.Schmitz, 1893
157. Species Halymenia rotunda Okamura, 1936 accepted as Galene rotunda (Okamura) D'Archino & Zuccarello, 2014
158. Species Halymenia saccata (Lepechin) C.Agardh, 1817 accepted as Halosaccion saccatum (Lepechin) Kützing, 1866
159. Species Halymenia saccata Harvey, 1860 accepted as Webervanbossea splachnoides (Harvey) De Toni fil., 1936
160. Species Halymenia sarniensis (Mertens) Duby, 1830 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805 (synonym)
161. Species Halymenia senegalensis M.Bodard, 1971 accepted as Sebdenia senegalensis (M.Bodard) E.Soler-Onís, 1998
162. Species Halymenia sinensis C.K.Tseng & C.F.Chang, 1984 accepted as Grateloupia turuturu Yamada, 1941
163. Species Halymenia sobolifera (M.Vahl) C.Agardh, 1817 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805
164. Species Halymenia spathulata J.Agardh, 1842 accepted as Kallymenia spathulata (J.Agardh) Codomier ex P.G.Parkinson, 1980 accepted as Felicinia spathulata (J.Agardh) Le Gall & Vergés, 2018
165. Species Halymenia speciosa Zanardini, 1874 accepted as Gelinaria ulvoidea Sonder, 1845
166. Species Halymenia templetonii (Setchell & N.L.Gardner) I.A.Abbott, 1967 accepted as Weeksia templetonii Setchell & N.L.Gardner, 1937 (synonym)
167. Species Halymenia trabeculata Ercegovic, 1949 accepted as Nesoia latifolia (P.Crouan & H.Crouan ex Kützing) H.W.Lee & M.S.Kim, 2019
168. Species Halymenia trigona (Clemente) C.Agardh, 1822 accepted as Scinaia furcellata (Turner) J.Agardh, 1851 (synonym)
169. Species Halymenia ulvoidea Zanardini, 1865 accepted as Halymenia floresii var. ulvoidea Codomier, 1974 (synonym)
170. Species Halymenia ulvoidea (Sonder) Kützing, 1849 accepted as Gelinaria ulvoidea Sonder, 1845
171. Species Halymenia urvilleana Montagne, 1842 accepted as Grateloupia urvilleana (Montagne) P.G.Parkinson, 1974
172. Species Halymenia usnea (R.Brown ex Turner) Greville, 1830 accepted as Hymenocladia usnea (R.Brown ex Turner) J.Agardh, 1852
173. Species Halymenia variegata Bory, 1828 accepted as Callophyllis variegata (Bory) Kützing, 1843
174. Species Halymenia ventricosa (J.V.Lamouroux) C.Agardh, 1822 accepted as Chrysymenia ventricosa (J.V.Lamouroux) J.Agardh, 1842 (synonym)
175. Species Halymenia ventusa Boergs. accepted as Halymenia venusta Børgesen, 1932 (misspelling)
176. Species Halymenia verruculosa (Bertoloni) Duby, 1830 accepted as Rissoella verruculosa (Bertoloni) J.Agardh, 1851 (synonym)

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