1. Species Gellius abbreviatus Topsent, 1918 accepted as Haliclona (Reniera) abbreviata (Topsent, 1918) (genus transfer)
2. Species Gellius aculeatus Whitelegge, 1897 accepted as Spirasigma aculeata (Whitelegge, 1897) (genus transfer)
3. Species Gellius amboinensis Lévi, 1961 accepted as Haliclona (Gellius) amboinensis (Lévi, 1961) (genus transfer)
4. Species Gellius anatarius Lévi & Lévi, 1983 accepted as Haliclona (Flagellia) anataria (Lévi & Lévi, 1983) (genus transfer)
5. Species Gellius angulatus (Bowerbank, 1866) accepted as Haliclona (Gellius) angulata (Bowerbank, 1866) (genus transfer)
6. Species Gellius apertus Sarà, 1960 accepted as Haliclona aperta (Sarà, 1960) (genus transfer)
7. Species Gellius arcofer Vosmaer, 1885 accepted as Hemigellius arcofer (Vosmaer, 1885) (genus transfer)
8. Species Gellius arcoferus Vosmaer, 1885 accepted as Hemigellius arcofer (Vosmaer, 1885) (genus transfer)
9. Species Gellius arcticus Hentschel, 1916 accepted as Haliclona ernsti Van Soest & Hooper, 2020 (genus transfer and preoccupied)
10. Species Gellius arcuarius Topsent, 1913 accepted as Haliclona (Gellius) arcuarius (Topsent, 1913) (genus transfer)
11. Species Gellius arnesenae Arndt, 1927 accepted as Hemigellius pumiceus (Fristedt, 1885)
12. Species Gellius benedeni (Topsent, 1901) accepted as Microxina benedeni (Topsent, 1901) (genus transfer)
13. Species Gellius bidens Topsent, 1901 accepted as Hemigellius bidens (Topsent, 1901) (genus transfer)
14. Species Gellius binarius Topsent, 1927 accepted as Haliclona (Gellius) binaria (Topsent, 1927) (genus transfer)
15. Species Gellius bioxeata Boury-Esnault, Pansini & Uriz, 1994 accepted as Haliclona (Gellius) bioxeata (Boury-Esnault, Pansini & Uriz, 1994) (genus transfer)
16. Species Gellius borzatii Sarà, 1978 accepted as Haliclona (Gellius) borzatii (Sarà, 1978) (genus transfer)
17. Species Gellius calcineus (Burton, 1954) accepted as Haliclona (Gellius) calcinea (Burton, 1954) (reverted genus transfer)
18. Species Gellius calyx Ridley & Dendy, 1886 accepted as Hemigellius calyx (Ridley & Dendy, 1886) (genus transfer)
19. Species Gellius canaliculatus Dendy, 1905 accepted as Oceanapia sagittaria (Sollas, 1902) (genus transfer & junior synonym)
20. Species Gellius capilliferus Levinsen, 1887 accepted as Biemna variantia (Bowerbank, 1858) (genus transfer and junior synonym)
21. Species Gellius carduus Ridley & Dendy, 1886 accepted as Haliclona (Gellius) carduus (Ridley & Dendy, 1886) (genus transfer)
22. Species Gellius cellarius (Rao, 1941) accepted as Haliclona (Gellius) cellaria (Rao, 1941) (genus transfer)
23. Species Gellius centrangulatus Sollas, 1902 accepted as Haliclona (Halichoclona) centrangulata (Sollas, 1902) (genus transfer)
24. Species Gellius ceratina Ridley, 1884 accepted as Haliclona (Gellius) ceratina (Ridley, 1884) (genus transfer)
25. Species Gellius constans Boury-Esnault & van Beveren, 1982 accepted as Haliclona (Gellius) constans (Boury-Esnault & van Beveren, 1982) (genus transfer)
26. Species Gellius couchii (Bowerbank, 1874) accepted as Haliclona (Gellius) fibulata (Schmidt, 1862) (genus transfer and junior synonym)
27. Species Gellius cucurbitiformis Kirkpatrick, 1907 accepted as Haliclona (Gellius) cucurbitiformis (Kirkpatrick, 1907) (genus transfer)
28. Species Gellius cymiformis accepted as Haliclona (Gellius) cymaeformis (Esper, 1806) (genus transfer and misspelling of species name)
29. Species Gellius digitatus Koltun, 1958 accepted as Haliclona (Gellius) vladimirkoltuni Van Soest & Hooper, 2020 (genus transfer and preoccupied)
30. Species Gellius dubius Babic, 1922 accepted as Haliclona (Gellius) dubia (Babic, 1922) (genus transfer)
31. Species Gellius edaphus de Laubenfels, 1930 accepted as Haliclona (Flagellia) edaphus de Laubenfels, 1930 (genus transfer)
32. Species Gellius epocheomaius De Laubenfels, 1930 (unaccepted > nomen nudum)
33. Species Gellius esperi Arnesen, 1903 accepted as Hemigellius arcofer (Vosmaer, 1885) (genus transfer and junior synonym)
34. Species Gellius fibrosus Wilson, 1925 accepted as Gelliodes wilsoni Carballo, Aquilar-Camacho, Knapp & Bell, 2013 (genus transfer)
35. Species Gellius fibulatus (Schmidt, 1862) accepted as Haliclona (Gellius) fibulata (Schmidt, 1862) (genus transfer)
36. Species Gellius fimbriatus Kirkpatrick, 1907 accepted as Hemigellius fimbriatus (Kirkpatrick, 1907) (genus transfer)
37. Species Gellius flabelliformis Ridley & Dendy, 1886 accepted as Haliclona (Gellius) flabelliformis (Ridley & Dendy, 1886) (genus transfer)
38. Species Gellius flagellifer Ridley & Dendy, 1886 accepted as Haliclona (Flagellia) flagellifera (Ridley & Dendy, 1886) (genus transfer)
39. Species Gellius flagellifera Ridley & Dendy, 1886 accepted as Haliclona (Flagellia) flagellifera (Ridley & Dendy, 1886) (genus transfer and misquote of name)
40. Species Gellius forcipatus Thiele, 1903 accepted as Haliclona (Gellius) forcipata (Thiele, 1903) (genus transfer)
41. Species Gellius friabilis Lévi, 1956 accepted as Haliclona (Gellius) friabilis (Lévi, 1956) (genus transfer)
42. Species Gellius gemmuliferus Breitfuss, 1912 accepted as Biemna variantia (Bowerbank, 1858) (genus transfer and junior synonym)
43. Species Gellius glaberrimus Topsent, 1897 accepted as Haliclona (Gellius) glaberrima (Topsent, 1897) (genus transfer)
44. Species Gellius glacialis Ridley & Dendy, 1886 accepted as Haliclona (Gellius) glacialis (Ridley & Dendy, 1886) (genus transfer)
45. Species Gellius hartlaubi Hentschel, 1929 accepted as Hemigellius hartlaubi (Hentschel, 1929) (genus transfer)
46. Species Gellius hispidulus Topsent, 1897 accepted as Haliclona (Gellius) hispidula (Topsent, 1897) (genus transfer)
47. Species Gellius imperialis Dendy, 1924 accepted as Calyx imperialis (Dendy, 1924) (genus transfer)
48. Species Gellius incrustans Hentschel, 1912 accepted as Haliclona (Flagellia) hentscheli Van Soest, 2017 (genus transfer and nomen novum)
49. Species Gellius infundibuliformis Vosmaer, 1885 accepted as Desmacella infundibuliformis (Vosmaer, 1885) (junior synonym)
50. Species Gellius intermedia Brøndsted, 1924 accepted as Haliclona (Gellius) intermedia (Brøndsted, 1924) (genus transfer)
51. Species Gellius irregularis Kieschnick, 1896 accepted as Haliclona (Gellius) kieschnicki Van Soest & Hooper, 2020 (genus transfer and preoccupied)
52. Species Gellius irregularis sensu Brøndsted, 1924 accepted as Haliclona (Gellius) holgerbrondstedi Van Soest & Hooper, 2020 (genus transfer and preoccupied)
53. Species Gellius jorii Uriz, 1984 accepted as Haliclona (Gellius) jorii (Uriz, 1984) (genus transfer)
54. Species Gellius jugosus (Bowerbank, 1866) accepted as Haliclona (Gellius) fibulata (Schmidt, 1862) (genus transfer and junior synonym)
55. Species Gellius kerguelenensis accepted as Calyx kerguelensis (Hentschel, 1914) (genus transfer and misspelling)
56. Species Gellius lacazei Topsent, 1893 accepted as Haliclona (Gellius) lacazei (Topsent, 1893) (genus transfer)
57. Species Gellius laevis Ridley & Dendy, 1886 accepted as Haliclona (Gellius) laevis (Ridley & Dendy, 1886) (genus transfer)
58. Species Gellius latisigmae Boury-Esnault & van Beveren, 1982 accepted as Haliclona (Gellius) latisigmae (Boury-Esnault & van Beveren, 1982) (genus transfer)
59. Species Gellius laurentinus Lambe, 1900 accepted as Haliclona (Gellius) laurentina (Lambe, 1900) (genus transfer)
60. Species Gellius luridus Lundbeck, 1902 accepted as Gelliodes luridus (Lundbeck, 1902) (genus transfer)
61. Species Gellius macrosigma Topsent, 1890 accepted as Coelosphaera (Coelosphaera) macrosigma (Topsent, 1890) (genus transfer)
62. Species Gellius marismedi Pulitzer-Finali, 1978 accepted as Haliclona (Gellius) marismedi (Pulitzer-Finali, 1978) (genus transfer)
63. Species Gellius massa (Carter, 1882) accepted as Neofibularia nolitangere (Duchassaing & Michelotti, 1864) (genus transfer and junior synonym)
64. Species Gellius massa Arnesen, 1903 accepted as Hemigellius pumiceus (Fristedt, 1885) (genus transfer)
65. Species Gellius megastoma Burton, 1928 accepted as Haliclona (Gellius) megastoma Burton, 1928 (genus transfer)
66. Species Gellius microsigma Babic, 1922 accepted as Haliclona (Gellius) microsigma (Babic, 1922) (genus transfer)
67. Species Gellius microsigma Dendy, 1916 accepted as Haliclona (Gellius) cymaeformis (Esper, 1806) (genus transfer & junior synonym)
68. Species Gellius microtoxa Lundbeck, 1902 accepted as Haliclona (Gellius) microtoxa (Lundbeck, 1902) (genus transfer)
69. Species Gellius microxea Li, 1986 accepted as Haliclona (Gellius) microxea (Li, 1986) (genus transfer)
70. Species Gellius microxifer Topsent, 1925 accepted as Haliclona (Gellius) microxifera (Topsent, 1925) (genus transfer)
71. Species Gellius panis Lendenfeld, 1888 accepted as Haliclona (Gellius) panis (Lendenfeld, 1888) (genus transfer)
72. Species Gellius pedunculatus Lévi, 1993 accepted as Haliclona (Gellius) claudelevii Van Soest & Hooper, 2020 (genus transfer and preoccupied)
73. Species Gellius perforatus Wilson, 1904 accepted as Haliclona (Gellius) perforata (Wilson, 1904) (genus transfer)
74. Species Gellius petrocalyx Dendy, 1924 accepted as Haliclona (Gellius) petrocalyx (Dendy, 1924) (genus transfer)
75. Species Gellius petrosioides (Dendy, 1905) accepted as Gelliodes petrosioides Dendy, 1905 (genus transfer)
76. Species Gellius phakellioides (Kirkpatrick, 1907) accepted as Microxina phakellioides (Kirkpatrick, 1907) (genus transfer)
77. Species Gellius phillipensis Dendy, 1895 accepted as Haliclona (Gellius) phillipensis (Dendy, 1895) (genus transfer)
78. Species Gellius pilosus Kirkpatrick, 1907 accepted as Hemigellius pilosus (Kirkpatrick, 1907) (genus transfer)
79. Species Gellius porosus (Fristedt, 1887) accepted as Haliclona (Flagellia) porosa (Fristedt, 1887) (genus transfer)
80. Species Gellius primitivus Lundbeck, 1902 accepted as Haliclona (Gellius) primitiva (Lundbeck, 1902) (genus transfer)
81. Species Gellius pumiceus (Fristedt, 1885) accepted as Hemigellius pumiceus (Fristedt, 1885) (genus transfer)
82. Species Gellius pyrrhi Hanitsch, 1895 accepted as Haliclona (Gellius) fibulata (Schmidt, 1862) (genus transfer and junior synonym)
83. Species Gellius raphidiophora Lendenfeld, 1888 accepted as Haliclona (Gellius) raphidiophora (Lendenfeld, 1888) (genus transfer)
84. Species Gellius ravus Stephens, 1912 accepted as Haliclona (Gellius) rava (Stephens, 1912) (genus transfer)
85. Species Gellius regius Brøndsted, 1924 accepted as Haliclona (Gellius) regia (Brøndsted, 1924)
86. Species Gellius reptans Whitelegge, 1906 accepted as Haliclona (Gellius) reptans (Whitelegge, 1906) (genus transfer)
87. Species Gellius rhaphidiophorus Brøndsted, 1933 accepted as Haliclona (Gellius) godthaabae Van Soest, 2024 (genus transfer and preoccupied)
88. Species Gellius ridleyi Hentschel, 1912 accepted as Haliclona (Gellius) ridleyi (Hentschel, 1912) (genus transfer)
89. Species Gellius robustus (Bowerbank, 1866) accepted as Oceanapia robusta (Bowerbank, 1866) (genus transfer)
90. Species Gellius rudis Topsent, 1901 accepted as Haliclona (Gellius) rudis (Topsent, 1901) (genus transfer)
91. Species Gellius sagittarius Sollas, 1902 accepted as Oceanapia sagittaria (Sollas, 1902) (genus transfer)
92. Species Gellius strongylatus Lindgren, 1897 accepted as Haliclona (Gellius) strongylata (Lindgren, 1897) (genus transfer)
93. Species Gellius stylifer Lendenfeld, 1897 accepted as Hemigellius stylifer (Lendenfeld, 1897) (genus transfer)
94. Species Gellius subtilis Pulitzer-Finali, 1982 accepted as Microxina subtilis (Pulitzer-Finali, 1982) accepted as Haliclona (Gellius) pulitzeri Van Soest & Hooper, 2020 (genus transfer)
95. Species Gellius tenellus Topsent, 1916 accepted as Haliclona (Gellius) jeancharcoti Van Soest & Hooper, 2020 (genus transfer and preoccupied)
96. Species Gellius tener Topsent, 1927 accepted as Haliclona (Gellius) emilei Van Soest & Hooper, 2020 (genus transfer and preoccupied)
97. Species Gellius tenuisigma Sarà & Siribelli, 1960 accepted as Haliclona (Gellius) tenuisigma (Sarà & Siribelli, 1960) (genus transfer)
98. Species Gellius textapatina de Laubenfels, 1926 accepted as Haliclona (Gellius) textapatina (de Laubenfels, 1926) (genus transfer)
99. Species Gellius toxius Topsent, 1897 accepted as Haliclona (Gellius) toxia (Topsent, 1897)
100. Species Gellius toxophorus Hentschel, 1912 accepted as Haliclona (Gellius) toxophora (Hentschel, 1912) (genus transfer)
101. Species Gellius toxotes Hentschel, 1912 (unaccepted, genus transfer)
102. Species Gellius tremulus Topsent, 1916 (unaccepted, genus transfer)
103. Species Gellius truncatus Kieschnick, 1896 (unaccepted, genus transfer)
104. Species Gellius tubuloramosus Dendy, 1924 (unaccepted, genus transfer and preoccupied)
105. Species Gellius tylotoxa Hentschel, 1914 (unaccepted, genus transfer)
106. Species Gellius tylotoxus Hentschel, 1914 (unaccepted, agreement in gender)
107. Species Gellius uncinatus Topsent, 1892 (unaccepted, genus transfer)
108. Species Gellius vagabundus (sensu Vosmaer, 1885) (unaccepted, genus transfer and preoccupied)
109. Species Gellius vagabundus (Schmidt, 1870) (unaccepted, reverted genus transfer)
110. Species Gellius varius (Bowerbank, 1875) (unaccepted, genus transfer)
111. Species Gellius varius (Bowerbank, 1875) sensu Lundbeck, 1909 (unaccepted, genus transfer and preoccupied)
112. Species Gellius vasiformis Wilson, 1925 (unaccepted, genus transfer)
113. Species Gellius proximus Lundbeck, 1902 (alternative representation, subgenus assignment)

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