1. Species Biddulphia antediluviana (Ehrenberg) Van Heurck, 1885
2. Species Biddulphia apiculata J.A.Long, Fuge & Js.Smith bis, 1946
3. Species Biddulphia belgicae M.Peragallo
4. Species Biddulphia biddulphiana (J.E.Smith) Boyer, 1900
5. Species Biddulphia discigera Grunow
6. Species Biddulphia elegantula Greville
7. Species Biddulphia homala Pantocsek
8. Species Biddulphia inelegans (Greville) C.S.Boyer
9. Species Biddulphia inflata Greville
10. Species Biddulphia juncta (A.Schmidt) A.Mann, 1925
11. Species Biddulphia nobilis J.-J.Brun
12. Species Biddulphia primordialis J.-J.Brun
13. Species Biddulphia punctata Greville
14. Species Biddulphia radiata Roper, 1859
15. Species Biddulphia regina W.Smith, 1856
16. Species Biddulphia rhombus (Ehrenberg) W.Smith, 1854
17. Species Biddulphia robertsiana (Greville) C.S.Boyer
18. Species Biddulphia rostrata F.Hustedt
19. Species Biddulphia schmidtii (C.Janisch) A.Mann
20. Species Biddulphia subaequa (Kützing) J.Ralfs, 1861
21. Species Biddulphia suborbicularis Grunow
22. Species Biddulphia tridens (Ehrenberg) Ehrenberg, 1841
23. Species Biddulphia tridentata Ehrenberg
24. Species Biddulphia tumida (Ehrenberg) Roper, 1859
25. Species Biddulphia tuomeyi (J.W.Bailey) Roper, 1859
26. Species Biddulphia alternans (Bailey) Van Heurck, 1885 accepted as Trigonium alternans (Bailey) A.Mann, 1907 accepted as Triceratium alternans f. alternans J.W. Bailey, 1851 (synonym)
27. Species Biddulphia arctica (Brightwell) Boyer, 1901 accepted as Trigonium arcticum (Brightwell) Cleve, 1868 (synonym)
28. Species Biddulphia aurita (Lyngbye) Brébisson, 1838 accepted as Odontella aurita (Lyngbye) C.Agardh, 1832 (synonym)
29. Species Biddulphia bailey W. Smith, 1856 accepted as Biddulphia mobiliensis (J.W.Bailey) Grunow, 1882 accepted as Trieres mobiliensis (J.W.Bailey) Ashworth & E.C.Theriot in Ashworth, Nakov & E.C.Theiriot, 2013
30. Species Biddulphia favus (Ehrenberg) Van Heurck, 1885 accepted as Triceratium favus Ehrenberg, 1839
31. Species Biddulphia formosa (Brightwell) E. Jörgensen, 1905 accepted as Trigonium formosum (Brightwell) Cleve, 1867 accepted as Triceratium formosum f. formosum Brightwell, 1856 (synonym)
32. Species Biddulphia kainii (E.A. Schultze in Kain & E.A. Schultze) Boyer, 1900 accepted as Triceratium kainii E.A.Schultze in Kain & Schultze, 1889 †
33. Species Biddulphia mobiliensis (J.W.Bailey) Grunow, 1882 accepted as Trieres mobiliensis (J.W.Bailey) Ashworth & E.C.Theriot in Ashworth, Nakov & E.C.Theiriot, 2013 (synonym)
34. Species Biddulphia picturatum (Greville) Taylor, 1970 accepted as Triceratium picturatum R.K.Greville, 1866 † accepted as Entogoniopsis foveata (R.K. Greville) J.Witkowski, P.A.Sims, N.I.Strelnikova & D.M.Williams, 2015 †
35. Species Biddulphia pulchella S.F.Gray, 1821 accepted as Biddulphia biddulphiana (J.E.Smith) Boyer, 1900 (synonym)
36. Species Biddulphia regia (Schultze) Ostenfeld, 1908 accepted as Trieres regia (M.Schultze) M.P.Ashworth & E.C.Theriot, 2013 (synonym)
37. Species Biddulphia roperiana Greville, 1859 accepted as Biddulphia obtusa (Kützing) Ralfs, 1861 accepted as Odontella obtusa Kützing, 1844 (synonym)
38. Species Biddulphia semicircularis (Brightwell) C.S.Boyer accepted as Euodiella semicircularis (Brightwell) P.A.Sims, 2000 † accepted as Triceratium semicirculare var. semicirculare Brightwell, 1853 (synonym)
39. Species Biddulphia abjecta Mann, 1925 (uncertain > unassessed)
40. Species Biddulphia abyssorum (uncertain > unassessed)
41. Species Biddulphia acanthoceros Forti, 1913 (uncertain > unassessed)
42. Species Biddulphia acuta (Ehrenberg) Boyer, 1900 accepted as Triceratium acutum Ehrenberg, 1844 (1845) (uncertain > unassessed)
43. Species Biddulphia advena VanLandingham, 1968 (uncertain > unassessed)
44. Species Biddulphia affinis (Grunow in Van Heurck) Van Heurck, 1909 accepted as Triceratium affine Grunow in Van Heurck, 1883 (uncertain > unassessed)
45. Species Biddulphia africana Leuduger-Fortmorel, 1898 (uncertain > unassessed)
46. Species Biddulphia agulhas Karsten, 1905 (uncertain > unassessed)
47. Species Biddulphia alaskiensis Mann, 1907 (uncertain > unassessed)
48. Species Biddulphia americana (Ralfs in Pritchard) Boyer, 1900 accepted as Triceratium americanum var. americanum Ralfs in Pritchard, 1861 (uncertain > unassessed)
49. Species Biddulphia amphicephala (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Odontella amphicephala Ehrenberg, 1845 (uncertain > unassessed)
50. Species Biddulphia angulata Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
51. Species Biddulphia antarctica (Ehrenberg) M. Peragallo, 1897 accepted as Hemiaulus antarcticus Ehrenberg, 1844 (uncertain > unassessed)
52. Species Biddulphia antarctica ‘Cleve' Mills (uncertain > unassessed)
53. Species Biddulphia antediluviana ‘Azpeitia y Moros' Mills, 1911 (uncertain > unassessed)
54. Species Biddulphia anthropomorpha Van Heurck, 1909 (uncertain > unassessed)
55. Species Biddulphia antillarum (Cleve) Boyer, 1900 accepted as Triceratium antillarum var. antillarum Cleve, 1878 (uncertain > unassessed)
56. Species Biddulphia antiqua Truan y Luard & Witt, 1888 (uncertain > unassessed)
57. Species Biddulphia apiculata Long, Fuge & Smith, 1946 (uncertain > unassessed)
58. Species Biddulphia arcuata (Shadbolt) F.W. Mills, 1933 accepted as Triceratium arcuatum Shadbolt, 1854 (uncertain > unassessed)
59. Species Biddulphia areolata Hajós, 1968 (uncertain > unassessed)
60. Species Biddulphia argus Boyer, 1898 (uncertain > unassessed)
61. Species Biddulphia armata Leuduger-Fortmorel, 1879 (uncertain > unassessed)
62. Species Biddulphia astrolabensis Hendey, 1937 (uncertain > unassessed)
63. Species Biddulphia auliscoformis Strelnikova, 1964 (uncertain > unassessed)
64. Species Biddulphia australis Montagne, 1842 (uncertain > unassessed)
65. Species Biddulphia azorica J.Pavillard, 1908 (uncertain > unassessed)
66. Species Biddulphia baileyii W. Smith, 1856 (uncertain > unassessed)
67. Species Biddulphia balaena (Ehrenberg) T.Brightwell accepted as Zygoceros balaena Ehrenberg, 1853 (uncertain > unassessed)
68. Species Biddulphia baldjikii Girard (uncertain > unassessed)
69. Species Biddulphia balearica (Cleve & Grunow) A.Mann, 1925 accepted as Triceratium balearicum f. balearicum Cleve & Grunow in Cleve, 1881 (uncertain > unassessed)
70. Species Biddulphia baltzoi Hanna, 1970 (uncertain > unassessed)
71. Species Biddulphia barbadensis Greville, 1866 (uncertain > unassessed)
72. Species Biddulphia bicorne Cleve, 1878 (uncertain > unassessed)
73. Species Biddulphia bicornis Cleve, 1878 (uncertain > unassessed)
74. Species Biddulphia bifasciata Wigand, 1860 (uncertain > unassessed)
75. Species Biddulphia bifenestra Brun, 1896 (uncertain > unassessed)
76. Species Biddulphia bipons ‘Ehrenberg' Mills, 1933 (uncertain > unassessed)
77. Species Biddulphia biquadrata (Janisch in Schmidt et al.) Boyer, 1900 accepted as Triceratium biquadratum Janisch, 1886 (uncertain > unassessed)
78. Species Biddulphia birostrata Grunow, 1863 (uncertain > unassessed)
79. Species Biddulphia birostrum Brun, 1891 (uncertain > unassessed)
80. Species Biddulphia blanda Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
81. Species Biddulphia boryana ‘Pantocsek' Mills, 1933 (uncertain > unassessed)
82. Species Biddulphia brachiolatum (Brightwell) Taylor, 1970 accepted as Triceratium brachiolatum Brightwell, 1853 (uncertain > unassessed)
83. Species Biddulphia brevis Ehrenberg, 1845 (uncertain > unassessed)
84. Species Biddulphia broeckii (Leuduger-Fortmorel) Mann, 1925 accepted as Triceratium broeckii Leuduger-Fortmorel, 1879 (uncertain > unassessed)
85. Species Biddulphia californica (Schmidt) Boyer, 1901 accepted as Cerataulus californicus Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
86. Species Biddulphia campeachiana (Grunow) Boyer, 1900 accepted as Triceratium campechianum Grunow in Cleve, 1878 (uncertain > unassessed)
87. Species Biddulphia capuzina Schmidt, 1888 (uncertain > unassessed)
88. Species Biddulphia caraibica Truan y Luard & Witt, 1888 (uncertain > unassessed)
89. Species Biddulphia castellifera (Grunow) Mann, 1925 accepted as Triceratium castelliferum A.Grunow, 1888 † accepted as Sheshukovia castellifera (A.Grunow) J.Witkowski, 2022 † (uncertain > unassessed)
90. Species Biddulphia catenata Schussnig, 1915 (uncertain > unassessed)
91. Species Biddulphia cayennensis Ehrenberg, 1854 (uncertain > unassessed)
92. Species Biddulphia centralis Boyer, 1922 (uncertain > unassessed)
93. Species Biddulphia challengerii Tsumura, 1969 (uncertain > unassessed)
94. Species Biddulphia chinensis Greville, 1866 (uncertain > unassessed)
95. Species Biddulphia cingulata Mann, 1925 (uncertain > unassessed)
96. Species Biddulphia circinus (Bailey) Van Heurck, 1896 accepted as Zygoceros circinus var. circinus J.W. Bailey, 1854 (uncertain > unassessed)
97. Species Biddulphia cirrus Ehrenberg, 1847 (uncertain > unassessed)
98. Species Biddulphia clavulata Ehrenberg, 1861 (uncertain > unassessed)
99. Species Biddulphia clypeolus Boyer, 1922 (uncertain > unassessed)
100. Species Biddulphia concava Mann, 1925 (uncertain > unassessed)
101. Species Biddulphia concinnus Van Heurck, 1896 (uncertain > unassessed)
102. Species Biddulphia condecora (Ehrenberg) Boyer, 1900 accepted as Triceratium condecorum var. condecorum Ehrenberg, 1844 (1845) (uncertain > unassessed)
103. Species Biddulphia connecta Wood, 1963 (uncertain > unassessed)
104. Species Biddulphia consimilis (Grunow in Van Heurck) Boyer, 1900 accepted as Triceratium consimile Grunow in Van Heurck, 1883 (uncertain > unassessed)
105. Species Biddulphia contorta Karsten, 1905 (uncertain > unassessed)
106. Species Biddulphia convexa Mann, 1937 (uncertain > unassessed)
107. Species Biddulphia convexiuscula (Grunow in Schmidt et al.) Boyer, 1900 accepted as Triceratium convexiusculum Grunow in Schmidt et al., 1890 (uncertain > unassessed)
108. Species Biddulphia cookiana Kain & Schultze, 1889 (uncertain > unassessed)
109. Species Biddulphia cornigera Mann, 1925 (uncertain > unassessed)
110. Species Biddulphia cornucaprae Brun, 1894 (uncertain > unassessed)
111. Species Biddulphia cornuta Brun, 1894 (uncertain > unassessed)
112. Species Biddulphia cornuta (Greville) Mann, 1925 accepted as Triceratium cornutum R.K.Greville † accepted as Trinacria cornuta (R.K.Greville) P.A.Sims & R.Ross, 1988 † (uncertain > unassessed)
113. Species Biddulphia corpulenta Greville, 1865 (uncertain > unassessed)
114. Species Biddulphia coruscans Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
115. Species Biddulphia costata Boyer, 1922 (uncertain > unassessed)
116. Species Biddulphia costulata (Grunow in Schmidt et al.) Boyer, 1900 accepted as Triceratium tumidum var. costulata Grunow in Schmidt et al., 1882 (uncertain > unassessed)
117. Species Biddulphia crassiuscula Pantocsek, 1892 (uncertain > unassessed)
118. Species Biddulphia crenulata Walker in Walker & Chase, 1886 (uncertain > unassessed)
119. Species Biddulphia cretacea Hajós & Stradner, 1974 (uncertain > unassessed)
120. Species Biddulphia cretacea Brun, 1896 (uncertain > unassessed)
121. Species Biddulphia cristata Grunow in Van Heurck, 1882 (uncertain > unassessed)
122. Species Biddulphia cruciata Petit, 1908 (uncertain > unassessed)
123. Species Biddulphia culcitella Mann, 1907 (uncertain > unassessed)
124. Species Biddulphia curvata Hendey & Sims, 1984 (uncertain > unassessed)
125. Species Biddulphia cuspidata (Janisch in Schmidt et al.) Mann, 1925 accepted as Triceratium cuspidatum Janisch in Schmidt et al., 1885 (uncertain > unassessed)
126. Species Biddulphia cycloides Mann, 1925 (uncertain > unassessed)
127. Species Biddulphia cylindrata Wood, Crosby & Cassie, 1959 (uncertain > unassessed)
128. Species Biddulphia cylindrus Weisse, 1867 (uncertain > unassessed)
129. Species Biddulphia damanuensis Christian, 1888 (uncertain > unassessed)
130. Species Biddulphia decipiens Grunow in Van Heurck, 1882 (uncertain > unassessed)
131. Species Biddulphia decorata Greville, 1865 (uncertain > unassessed)
132. Species Biddulphia decumana Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
133. Species Biddulphia decussata Strelnikova, 1965 (uncertain > unassessed)
134. Species Biddulphia deodora Hanna & Grant, 1926 (uncertain > unassessed)
135. Species Biddulphia discursa Mann, 1925 (uncertain > unassessed)
136. Species Biddulphia dissipata Grove & Sturt, 1887 (uncertain > unassessed)
137. Species Biddulphia distincta (Janisch in Schmidt et al.) Mann, 1925 accepted as Triceratium distinctum var. distinctum Janisch in Schmidt et al., 1885 (uncertain > unassessed)
138. Species Biddulphia divisa Grunow in Van Heurck, 1883 (uncertain > unassessed)
139. Species Biddulphia dubia (T.Brightwell) Cleve, 1883 accepted as Pseudictyota dubium (Brightwell) P.A. Sims & D. M. Williams in Sims et al., 2018 (uncertain > unassessed)
140. Species Biddulphia echinata Kitton, 1888 (uncertain > unassessed)
141. Species Biddulphia echinulata Jousé in Proschkina-Lavrenko, 1949 (uncertain > unassessed)
142. Species Biddulphia ecornuta Strelnikova, 1974 (uncertain > unassessed)
143. Species Biddulphia edwardsii Febiger ex Grunow, 1882 (uncertain > unassessed)
144. Species Biddulphia elaborata Grove & Sturt, 1886 (uncertain > unassessed)
145. Species Biddulphia elegans (Greville) Boyer, 1900 accepted as Amphitetras elegans Greville, 1866 (uncertain > unassessed)
146. Species Biddulphia elesdiana Pantocsek, 1889 (uncertain > unassessed)
147. Species Biddulphia elongata Meneghini in Kützing, 1849 (uncertain > unassessed)
148. Species Biddulphia eulensteinii (Grunow in A. Schmidt) Grunow in Van Heurck, 1896 accepted as Triceratium eulensteinii var. eulensteinii Grunow in Schmidt et al., 1882 (uncertain > unassessed)
149. Species Biddulphia exacta Mann, 1925 (uncertain > unassessed)
150. Species Biddulphia expedita Janisch in Schmidt et al., 1888 (uncertain > unassessed)
151. Species Biddulphia extensa Mann, 1907 (uncertain > unassessed)
152. Species Biddulphia falcata Boyer, 1922 (uncertain > unassessed)
153. Species Biddulphia fenestrata (Grove & Sturt) Grunow in Schmidt et al., 1888 accepted as Auliscus fenestratus Grove & Sturt, 1887 (uncertain > unassessed)
154. Species Biddulphia fimbriata (Wallich) Mann, 1925 accepted as Triceratium fimbriatum Wallich, 1858 (uncertain > unassessed)
155. Species Biddulphia fistulosa Pantocsek, 1892 (uncertain > unassessed)
156. Species Biddulphia flos (Ehrenberg) Grunow (uncertain > unassessed)
157. Species Biddulphia fortiana Tempère in Forti, 1913 (uncertain > unassessed)
158. Species Biddulphia fossa Grove & Sturt, 1887 (uncertain > unassessed)
159. Species Biddulphia fractosa Mann, 1925 (uncertain > unassessed)
160. Species Biddulphia fragilaria (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Denticella fragilaria Ehrenberg, 1844 (uncertain > unassessed)
161. Species Biddulphia fragilis Bone & Gosden, 1967 (uncertain > unassessed)
162. Species Biddulphia frauenfeldii Grunow in Van Heurck, 1883 (uncertain > unassessed)
163. Species Biddulphia frickei Van Heurck, 1909 (uncertain > unassessed)
164. Species Biddulphia fulva Boyer, 1922 (uncertain > unassessed)
165. Species Biddulphia gallapagensis Cleve, 1881 (uncertain > unassessed)
166. Species Biddulphia gemina (Schmidt in Schmidt et al.) Mann, 1925 accepted as Triceratium geminum Schmidt in Schmidt et al., 1882 (uncertain > unassessed)
167. Species Biddulphia gibbosa (uncertain > unassessed)
168. Species Biddulphia gigantea Greville, 1864 (uncertain > unassessed)
169. Species Biddulphia gigas Ehrenberg, 1844 (uncertain > unassessed)
170. Species Biddulphia gladiorum A.Mann, 1907 (uncertain > unassessed)
171. Species Biddulphia grandicornis Tsumura, 1969 (uncertain > unassessed)
172. Species Biddulphia grandis (Brightwell) Boyer, 1900 accepted as Triceratium grande f. grande Brightwell, 1853 (uncertain > unassessed)
173. Species Biddulphia grovei Pantocsek, 1892 (uncertain > unassessed)
174. Species Biddulphia gruendleri Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
175. Species Biddulphia grunowiana (Castracane) Mann, 1925 accepted as Triceratium grunowianum Castracane, 1886 (uncertain > unassessed)
176. Species Biddulphia gurowii Pantocsek, 1892 (uncertain > unassessed)
177. Species Biddulphia hamata ‘Pantocsek' De Toni, 1886 (uncertain > unassessed)
178. Species Biddulphia hebetata (Grunow in Van Heurck) Boyer, 1900 accepted as Triceratium irregulare var. hebetata Grunow in Van Heurck, 1883 (uncertain > unassessed)
179. Species Biddulphia heibergii H.F.Van Heurck (uncertain > unassessed)
180. Species Biddulphia heilpriniana (Kain & E.A. Schultze) Boyer, 1900 accepted as Triceratium heilprinianum Kain & Schultze, 1889 (uncertain > unassessed)
181. Species Biddulphia hemitropa L.W. Bailey, 1862 (uncertain > unassessed)
182. Species Biddulphia heteroceros Grunow in Van Heurck, 1882 (uncertain > unassessed)
183. Species Biddulphia heteropora (Grunow in Van Heurck) Boyer, 1900 accepted as Triceratium heteroporum Grunow in Van Heurck, 1883 (uncertain > unassessed)
184. Species Biddulphia hexagonalis Boyer, 1922 (uncertain > unassessed)
185. Species Biddulphia hyalina Schröder, 1906 (uncertain > unassessed)
186. Species Biddulphia hyalina Peragallo in Tempère & Peragallo, 1909 (uncertain > unassessed)
187. Species Biddulphia immanis Boyer, 1922 (uncertain > unassessed)
188. Species Biddulphia imperialis Walker in Walker & Chase, 1886 (uncertain > unassessed)
189. Species Biddulphia impressa Long, Fuge & Smith, 1946 (uncertain > unassessed)
190. Species Biddulphia impressa (Grunow) Mann, 1925 accepted as Triceratium impressum Grunow, 1883 (uncertain > unassessed)
191. Species Biddulphia includens Ehrenberg, 1855 (uncertain > unassessed)
192. Species Biddulphia indica (Ehrenberg) Roper, 1859 accepted as Denticella indica Ehrenberg, 1845 (uncertain > unassessed)
193. Species Biddulphia informis Mann, 1925 (uncertain > unassessed)
194. Species Biddulphia infundibuloides Desikachary, Gowthaman & Latha, 1987 (uncertain > unassessed)
195. Species Biddulphia insignis (Greville) Mann, 1925 accepted as Triceratium insigne f. insignis Greville, 1861 (uncertain > unassessed)
196. Species Biddulphia interpunctata (Grunow in Schmidt et al.) Boyer, 1900 accepted as Triceratium interpunctatum Grunow in Schmidt et al., 1882 (uncertain > unassessed)
197. Species Biddulphia interrupta Boyer, 1898 (uncertain > unassessed)
198. Species Biddulphia inusitata Hohn & Hellerman, 1966 accepted as Pleurosira inusitata (Hohn & Hellerman) Desianti & Potapova, 2015 (uncertain > unassessed)
199. Species Biddulphia inversa ‘Mann' Mills, 1925 (uncertain > unassessed)
200. Species Biddulphia inverta Mann, 1925 (uncertain > unassessed)
201. Species Biddulphia irregulare (uncertain > unassessed)
202. Species Biddulphia japonica Castracane, 1886 (uncertain > unassessed)
203. Species Biddulphia japonica Pantocsek, 1892 (uncertain > unassessed)
204. Species Biddulphia jimboi Pantocsek, 1903 (uncertain > unassessed)
205. Species Biddulphia johnsoniana Greville, 1866 (uncertain > unassessed)
206. Species Biddulphia jordani Hanna & Grant, 1926 (uncertain > unassessed)
207. Species Biddulphia jucatensis (Grunow in Schmidt et al.) Boyer, 1927 accepted as Triceratium jucatense Grunow in Schmidt et al., 1882 (uncertain > unassessed)
208. Species Biddulphia juncatensis (Grunow) Mann, 1925 accepted as Triceratium jucatense Grunow in Schmidt et al., 1882 (uncertain > unassessed)
209. Species Biddulphia keeleyi Boyer, 1898 (uncertain > unassessed)
210. Species Biddulphia kemnae Van Heurck, 1909 (uncertain > unassessed)
211. Species Biddulphia lacunosa Long, Fuge & Smith, 1946 (uncertain > unassessed)
212. Species Biddulphia laevis Ehrenberg, 1843 (uncertain > unassessed)
213. Species Biddulphia lata (Greville) E. Jørgensen, 1905 accepted as Triceratium latum var. latum Greville, 1865 (uncertain > unassessed)
214. Species Biddulphia lata Grove & Sturt, 1886-1887 (uncertain > unassessed)
215. Species Biddulphia levigata Sheshukova-Poretskaya, 1967 (uncertain > unassessed)
216. Species Biddulphia levis Ehrenberg, 1843 (uncertain > unassessed)
217. Species Biddulphia litigiosa Van Heurck, 1909 (uncertain > unassessed)
218. Species Biddulphia lóczyi Pantocsek, 1889 (uncertain > unassessed)
219. Species Biddulphia longaeva Long, Fuge & Smith, 1946 (uncertain > unassessed)
220. Species Biddulphia longicornis Skvortzow, 1931 (uncertain > unassessed)
221. Species Biddulphia longicruris Greville, 1859 accepted as Hobaniella longicruris (Greville) P.A. Sims & D.M. Williams in Sims et al., 2018 (uncertain > unassessed, synonym)
222. Species Biddulphia longispina Grunow in Van Heurck, 1882 (uncertain > unassessed)
223. Species Biddulphia luminosa (J.-J.Brun & J.A.Tempère) A.Mann accepted as Triceratium luminosum Tempère & Brun in Brun & Tempère, 1889 (uncertain > unassessed)
224. Species Biddulphia lunaris ‘Auctorum' according to Mills (uncertain > unassessed)
225. Species Biddulphia lunata Ehrenberg, 1844 (uncertain > unassessed)
226. Species Biddulphia macdonaldii Norman in Pritchard, 1861 (uncertain > unassessed)
227. Species Biddulphia madagascarensis (Grunow in Van Heurck) Mann, 1925 accepted as Triceratium madagascarense Grunow in Van Heurck, 1883 (uncertain > unassessed)
228. Species Biddulphia mammosa Greville, 1866 (uncertain > unassessed)
229. Species Biddulphia manca Janisch in Schmidt et al., 1888 (uncertain > unassessed)
230. Species Biddulphia media H. Peragallo in Tempère & Peragallo, 1909 (uncertain > unassessed)
231. Species Biddulphia mediterranensis ‘Grunow' Mills (uncertain > unassessed)
232. Species Biddulphia membranacea Cleve, 1878 (uncertain > unassessed)
233. Species Biddulphia minima Schiller in Hustedt, 1930 (uncertain > unassessed)
234. Species Biddulphia minuta (Greville) Andrews, 1988 accepted as Amphitetras minuta Greville, 1861 (uncertain > unassessed)
235. Species Biddulphia minutissima Greville, 1886 (uncertain > unassessed)
236. Species Biddulphia miraculosa Brun in Schmidt et al., 1892 (uncertain > unassessed)
237. Species Biddulphia mobiliensis sensu Gran, 1905 (uncertain > unassessed)
238. Species Biddulphia moholensis Schrader, 1974 (uncertain > unassessed)
239. Species Biddulphia mollis Mann, 1937 (uncertain > unassessed)
240. Species Biddulphia montereyi (Brightwell) Mereschkowsky, 1901 accepted as Triceratium montereyi f. montereyi Brightwell, 1853 (uncertain > unassessed)
241. Species Biddulphia moronensis (Greville) T.V. Desikachary, 1989 accepted as Triceratium moronense var. moronense Greville, 1865 (uncertain > unassessed)
242. Species Biddulphia murrayana Hendey, 1939 (uncertain > unassessed)
243. Species Biddulphia mythica Tsumura, 1969 (uncertain > unassessed)
244. Species Biddulphia nankoorensis ‘Grunow in Van Heurck' M. Peragallo, 1897 (uncertain > unassessed)
245. Species Biddulphia neogradensis (Pantocsek) F.W. Mills, 1933 accepted as Odontella neogradensis Pantocsek, 1886 (uncertain > unassessed)
246. Species Biddulphia nervata Boyer, 1922 (uncertain > unassessed)
247. Species Biddulphia nitida Greville, 1865 (uncertain > unassessed)
248. Species Biddulphia nobilis (Witt) E. Jørgensen, 1905 accepted as Triceratium nobile Witt, 1885 (uncertain > unassessed)
249. Species Biddulphia nobilis (Greville) Brockmann, 1928 accepted as Amphitetras nobilis Greville, 1865 (uncertain > unassessed)
250. Species Biddulphia novaezealandiae Wise, 1952 (uncertain > unassessed)
251. Species Biddulphia oamaruensis Grove & Sturt, 1886 (uncertain > unassessed)
252. Species Biddulphia obliquata (J.E. Smith) Gray, 1821 (uncertain > unassessed)
253. Species Biddulphia obtusa (Kützing) Ralfs, 1861 accepted as Odontella obtusa Kützing, 1844 (uncertain > unassessed)
254. Species Biddulphia obtusa (Ehrenberg) Boyer, 1901 accepted as Triceratium obtusum f. obtusum Ehrenberg, 1844 (uncertain > unassessed)
255. Species Biddulphia occidentalis (L.W. Bailey) Wolle, 1890 accepted as Zygoceros occidentalis J.W. Bailey in L.W. Bailey, 1861 (uncertain > unassessed)
256. Species Biddulphia orbiculata (Shadbolt) Boyer, 1900 accepted as Triceratium orbiculatum var. orbiculatum Shadbolt, 1854 (uncertain > unassessed)
257. Species Biddulphia ornata (Shadbolt) Castracane, 1886 accepted as Amphitetras ornata var. ornata Shadbolt, 1854 (uncertain > unassessed)
258. Species Biddulphia ottomuelleri (uncertain > unassessed)
259. Species Biddulphia ovalis (Schmidt in Schmidt et al.) Boyer, 1900 accepted as Cerataulus ovalis Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
260. Species Biddulphia pacifica (Grunow in Schmidt et al.) Mann, 1907 accepted as Cerataulus pacificus Grunow in Schmidt et al., 1888 (uncertain > unassessed)
261. Species Biddulphia palpebralis Forti in Tempère & Peragallo, 1914 (uncertain > unassessed)
262. Species Biddulphia pantocsekites VanLandingham, 1968 (uncertain > unassessed)
263. Species Biddulphia papillata (Grove & Sturt) Mann, 1907 accepted as Triceratium papillatum var. papillatum Grove & Sturt, 1887 (uncertain > unassessed)
264. Species Biddulphia paradoxa Petit, 1908 (uncertain > unassessed)
265. Species Biddulphia parallela Castracane, 1886 (uncertain > unassessed)
266. Species Biddulphia parallela ‘Ehrenberg' Grunow in Van Heurck, 1883 (uncertain > unassessed)
267. Species Biddulphia parvula (Janisch & Rabenhorst) Boyer, 1900 accepted as Amphitetras parvula Janisch & Rabenhorst, 1863 (uncertain > unassessed)
268. Species Biddulphia patagoniana Frenguelli, 1941 (uncertain > unassessed)
269. Species Biddulphia patagonica Ehrenberg, 1854 (uncertain > unassessed)
270. Species Biddulphia patera Barker & Meakin, 1949 (uncertain > unassessed)
271. Species Biddulphia pedalis Grove & Sturt, 1887 (uncertain > unassessed)
272. Species Biddulphia pelagica J.L.B.Schröder, 1908 (uncertain > unassessed)
273. Species Biddulphia pellucida Castracane, 1886 (uncertain > unassessed)
274. Species Biddulphia penitens Hanna & Grant, 1926 (uncertain > unassessed)
275. Species Biddulphia pentacrinus (Ehrenberg) Boyer, 1901 accepted as Amphipentas pentacrinus Ehrenberg, 1841 † (uncertain > unassessed)
276. Species Biddulphia peragalli (uncertain > unassessed)
277. Species Biddulphia peragalloi Leuduger-Fortmorel, 1898 (uncertain > unassessed)
278. Species Biddulphia permagna Pantocsek, 1889 (uncertain > unassessed)
279. Species Biddulphia permagna (Janisch) Van Heurck, 1909 accepted as Triceratium permagnum Janisch, 1888 (uncertain > unassessed)
280. Species Biddulphia perplexa Long, Fuge & Smith, 1946 (uncertain > unassessed)
281. Species Biddulphia perpusilla J.W. Bailey Collection according to Chase, 1885 (uncertain > unassessed)
282. Species Biddulphia petitiana (Leuduger-Fortmorel) Mann, 1925 accepted as Triceratium petitianum Leuduger-Fortmorel, 1898 (uncertain > unassessed)
283. Species Biddulphia petitii (Leuduger-Fortmorel) Mann, 1925 accepted as Cerataulus petitii Leuduger-Fortmorel, 1892 (uncertain > unassessed)
284. Species Biddulphia petrolia Hanna, 1927 (uncertain > unassessed)
285. Species Biddulphia phallus Leuduger-Fortmorel, 1898 (uncertain > unassessed)
286. Species Biddulphia plana Schmidt in Schmidt et al., 1888 accepted as Pseudictyota plana (A. Schmidt) P.A. Sims & D. M. Williams in Sims et al., 2018 (uncertain > unassessed)
287. Species Biddulphia plicata Grunow in Van Heurck, 1883 (uncertain > unassessed)
288. Species Biddulphia podagrosa Greville, 1866 (uncertain > unassessed)
289. Species Biddulphia polyacanthos Brun, 1891 (uncertain > unassessed)
290. Species Biddulphia polymera (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Denticella polymera Ehrenberg, 1844 (1845) (uncertain > unassessed)
291. Species Biddulphia polymorpha Manguin, 1915 (uncertain > unassessed)
292. Species Biddulphia polymorpha (Montagne) Mann, 1925 accepted as Isthmia polymorpha Montagne, 1840 (uncertain > unassessed)
293. Species Biddulphia primordinalis Long, Fuge & Smith, 1946 (uncertain > unassessed)
294. Species Biddulphia pulchella sensu Möller, 1892 (uncertain > unassessed)
295. Species Biddulphia pulverulenta Mann, 1937 (uncertain > unassessed)
296. Species Biddulphia pumila Castracane, 1886 (uncertain > unassessed)
297. Species Biddulphia punctata (Brightwell) Van Heurck, 1896 accepted as Triceratium punctatum f. punctatum Brightwell, 1856 (uncertain > unassessed)
298. Species Biddulphia punctata Grove & Sturt ex Brun, 1896 (uncertain > unassessed)
299. Species Biddulphia pustulata Brun, 1891 (uncertain > unassessed)
300. Species Biddulphia pygmea Mann, 1925 (uncertain > unassessed)
301. Species Biddulphia quadrans Boyer, 1922 (uncertain > unassessed)
302. Species Biddulphia quadricornis (Grunow) Boyer, 1901 accepted as Zygoceros quadricornis Grunow in Van Heurck, 1883 (uncertain > unassessed)
303. Species Biddulphia quinquelocularis Kützing, 1844 (uncertain > unassessed)
304. Species Biddulphia radialis Andrews, 1986 (uncertain > unassessed)
305. Species Biddulphia radiata W.Smith accepted as Eupodiscus radiatus W. Smith, 1853 (uncertain > unassessed)
306. Species Biddulphia radiata (Brightwell) Grunow in Van Heurck, 1883 accepted as Triceratium radiatum var. radiatum Brightwell, 1856 (uncertain > unassessed)
307. Species Biddulphia radiopunctata ‘Mann' according to Mills, 1933 (uncertain > unassessed)
308. Species Biddulphia radiosoreticulata Grunow in Van Heurck, 1883 (uncertain > unassessed)
309. Species Biddulphia repleta (uncertain > unassessed)
310. Species Biddulphia reticulata Roper, 1859 accepted as Pseudictyota reticulata (Roper) P.A. Sims & D. M. Williams in Sims et al., 2018 (uncertain > unassessed)
311. Species Biddulphia reticulum (Ehrenberg) Boyer, 1900 accepted as Triceratium reticulum f. reticulum Ehrenberg, 1844 (uncertain > unassessed)
312. Species Biddulphia retiformis Mann, 1925 (uncertain > unassessed)
313. Species Biddulphia reversa Grove & Sturt, 1887 (uncertain > unassessed)
314. Species Biddulphia robusta Pantocsek, 1889 (uncertain > unassessed)
315. Species Biddulphia rossica Pantocsek, 1889 (uncertain > unassessed)
316. Species Biddulphia rotunda M. Peragallo in Tempère & Peragallo, 1908 (uncertain > unassessed)
317. Species Biddulphia rotundata Janisch, 1888 (uncertain > unassessed)
318. Species Biddulphia rudis Mann, 1925 (uncertain > unassessed)
319. Species Biddulphia russica Pantocsek, 1889 (uncertain > unassessed)
320. Species Biddulphia rustica (Mann) Boyer, 1927 accepted as Trigonium rusticum Mann, 1907 (uncertain > unassessed)
321. Species Biddulphia sanpedroana Mereschkowsky, 1900 (uncertain > unassessed)
322. Species Biddulphia sansibarica A. Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
323. Species Biddulphia saratoviana Pantocsek, 1889 (uncertain > unassessed)
324. Species Biddulphia schroederiana Schüssnig, 1915 (uncertain > unassessed)
325. Species Biddulphia scitula Mann, 1925 (uncertain > unassessed)
326. Species Biddulphia sculpta (Shadbolt) Van Heurck, 1885 accepted as Triceratium sculptum var. sculptum Shadbolt, 1854 (uncertain > unassessed)
327. Species Biddulphia scutellum Mann, 1907 (uncertain > unassessed)
328. Species Biddulphia scutum Bone & Gosden, 1967 (uncertain > unassessed)
329. Species Biddulphia secedens (Schmidt in Schmidt et al.) Mann, 1925 accepted as Triceratium secedens Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
330. Species Biddulphia sentum (Witt in Schmidt et al.) Van Heurck, 1909 accepted as Triceratium sentum f. sentum Witt in Schmidt et al., 1890 (uncertain > unassessed)
331. Species Biddulphia separanda Janisch in Schmidt et al., 1888 (uncertain > unassessed)
332. Species Biddulphia septemlocularis Kützing, 1844 (uncertain > unassessed)
333. Species Biddulphia seticulosa Grunow, 1882 (uncertain > unassessed)
334. Species Biddulphia setigera (J.W. Bailey) Mann, 1907 accepted as Triceratium setigerum J.W.Bailey, 1854 (uncertain > unassessed)
335. Species Biddulphia seychellensis Grunow in Van Heurck, 1883 (uncertain > unassessed)
336. Species Biddulphia seychellensis (Grunow in Van Heurck) F.W. Mills, 1883 accepted as Triceratium seychellense Grunow in Van Heurck, 1883 (uncertain > unassessed)
337. Species Biddulphia shadboltiana (Greville) Mann, 1907 accepted as Triceratium shadboltianum f. shadboltianum Greville, 1862 (uncertain > unassessed)
338. Species Biddulphia shulzei Boyer, 1898 (uncertain > unassessed)
339. Species Biddulphia simplex Mereschkowsky, 1900 (uncertain > unassessed)
340. Species Biddulphia sinensis Greville, 1866 (uncertain > unassessed)
341. Species Biddulphia sinuata Greville, 1865 (uncertain > unassessed)
342. Species Biddulphia smithii (Ralfs in Pritchard) Van Heurck, 1885 accepted as Ralfsiella smithii (Ralfs in Pritchard) P.A. Sims, D. M. Williams & Ashworth, 2018 (uncertain > unassessed)
343. Species Biddulphia sparsepunctata Hajós in Hajós & Stradner, 1974 (uncertain > unassessed)
344. Species Biddulphia spicata Boyer, 1922 (uncertain > unassessed)
345. Species Biddulphia spinosa (J.W.Bailey) Boyer, 1927 accepted as Triceratium spinosum f. spinosum J.W. Bailey, 1844 (uncertain > unassessed)
346. Species Biddulphia spinulosa (Grunow in Schmidt et al.) Mann, 1925 accepted as Triceratium spinulosum Grunow in Schmidt et al., 1885 (uncertain > unassessed)
347. Species Biddulphia stipitata (J. E. Smith) Gray, 1821 (uncertain > unassessed)
348. Species Biddulphia striata Karsten, 1905 (uncertain > unassessed)
349. Species Biddulphia striolata (Ehrenberg) (uncertain > unassessed)
350. Species Biddulphia sturtii Wise, 1952 (uncertain > unassessed)
351. Species Biddulphia subaequa Schmidt in Schmidt et al., 1888 (uncertain > unassessed)
352. Species Biddulphia subjuncta Mann, 1907 (uncertain > unassessed)
353. Species Biddulphia sublaevis Grunow in Van Heurck, 1882 (uncertain > unassessed)
354. Species Biddulphia subquadrata Boyer, 1922 (uncertain > unassessed)
355. Species Biddulphia subrotundata (Schmidt in Schmidt et al.) Boyer, 1900 accepted as Triceratium subrotundatum f. subrotundatum Schmidt in Schmidt et al., 1886 (uncertain > unassessed)
356. Species Biddulphia subsalsa Lemmermann, 1907 (uncertain > unassessed)
357. Species Biddulphia surirella (Ehrenberg) Rabenhorst, 1864 accepted as Zygoceros surirella Ehrenberg, 1840 (uncertain > unassessed)
358. Species Biddulphia suspecta M. Peragallo, 1924 (uncertain > unassessed)
359. Species Biddulphia suzuensis Ichikawa in Ichikawa, Fuji & Bachmann, 1964 (uncertain > unassessed)
360. Species Biddulphia szurdokpuespoekiensis Hajós, 1968 (uncertain > unassessed)
361. Species Biddulphia tabellaria (Brightwell) Boyer, 1900 (uncertain > unassessed)
362. Species Biddulphia tabellariaeformis Forti, 1913 (uncertain > unassessed)
363. Species Biddulphia tahitiensis Ricard, 1975 (uncertain > unassessed)
364. Species Biddulphia temperei (Brun) Mann, 1925 (uncertain > unassessed)
365. Species Biddulphia tenera Strelnikova, 1974 (uncertain > unassessed)
366. Species Biddulphia tenera Grove & Sturt, 1887 (uncertain > unassessed)
367. Species Biddulphia tentaculifera Cleve, 1881 (uncertain > unassessed)
368. Species Biddulphia tenuis L.W. Bailey, 1861 (uncertain > unassessed)
369. Species Biddulphia tessellata (Greville) Boyer, 1900 (uncertain > unassessed)
370. Species Biddulphia testudo (Brun in Brun & Tempère) Boyer, 1900 (uncertain > unassessed)
371. Species Biddulphia thumii (Schmidt in Schmidt et al.) Boyer, 1900 (uncertain > unassessed)
372. Species Biddulphia titiana Grunow in Van Heurck, 1883 (uncertain > unassessed)
373. Species Biddulphia tortura Hendey & Sims, 1984 (uncertain > unassessed)
374. Species Biddulphia translucida Van Heurck, 1909 (uncertain > unassessed)
375. Species Biddulphia transversa Wigand, 1860 (uncertain > unassessed)
376. Species Biddulphia tridentata ‘Weisse' according to Hustedt, 1930 (uncertain > unassessed)
377. Species Biddulphia tridentata Weisse, 1854 (uncertain > unassessed)
378. Species Biddulphia tridentula Ehrenberg, 1843 (uncertain > unassessed)
379. Species Biddulphia triloba Sheshukova-Poretskaya V.S., 1967 (uncertain > unassessed)
380. Species Biddulphia trilocularis Kützing, 1844 (uncertain > unassessed)
381. Species Biddulphia trinacria L.W. Bailey, 1861 (uncertain > unassessed)
382. Species Biddulphia tripartita (Grunow) Van Heurck (uncertain > unassessed)
383. Species Biddulphia tripos (Cleve) Mann, 1925 (uncertain > unassessed)
384. Species Biddulphia trisinua Mann, 1925 (uncertain > unassessed)
385. Species Biddulphia trisulca (J.W. Bailey ex Ralfs in Pritchard) Boyer, 1900 (uncertain > unassessed)
386. Species Biddulphia tschestnovii Pantocsek, 1892 (uncertain > unassessed)
387. Species Biddulphia tubulosa Brun, 1891 (uncertain > unassessed)
388. Species Biddulphia tumescens (Castracane) Mann, 1925 (uncertain > unassessed)
389. Species Biddulphia turgida (Ehrenberg) W.Smith, 1856 (uncertain > unassessed)
390. Species Biddulphia turrigera Mann, 1925 (uncertain > unassessed)
391. Species Biddulphia uncinata ‘Schmidt in Schmidt et al.' Mills, 1933 (uncertain > unassessed)
392. Species Biddulphia undulata Long, Fuge & Smith, 1946 (uncertain > unassessed)
393. Species Biddulphia undulosa Mann, 1925 (uncertain > unassessed)
394. Species Biddulphia unifasciata Wigand, 1860 (uncertain > unassessed)
395. Species Biddulphia ursina Ehrenberg, 1844 (uncertain > unassessed)
396. Species Biddulphia vanheurckii (uncertain > unassessed)
397. Species Biddulphia varians (Lauder) Lebour, 1930 (uncertain > unassessed)
398. Species Biddulphia vasta Pantocsek, 1889 (uncertain > unassessed)
399. Species Biddulphia venosa (uncertain > unassessed)
400. Species Biddulphia venulosa Barker & Meakin, 1949 (uncertain > unassessed)
401. Species Biddulphia verrucosa Boyer, 1898 (uncertain > unassessed)
402. Species Biddulphia vesiculosa (Agardh) Kützing, 1833 (uncertain > unassessed)
403. Species Biddulphia virgata Grove & Sturt, 1886 (uncertain > unassessed)
404. Species Biddulphia vitrea Brun, 1891 (uncertain > unassessed)
405. Species Biddulphia vittata Grove & Sturt, 1887 (uncertain > unassessed)
406. Species Biddulphia voigtii Meister, 1932 (uncertain > unassessed)
407. Species Biddulphia weissei (Grunow in Schmidt et al.) E. Jørgensen, 1905 (uncertain > unassessed)
408. Species Biddulphia weissflogii Grunow, 1882 (uncertain > unassessed)
409. Species Biddulphia weissflogii Janisch in Schmidt et al., 1888 (uncertain > unassessed)
410. Species Biddulphia weissii (Grunow in Schmidt et al.) Van Heurck, 1909 (uncertain > unassessed)
411. Species Biddulphia woolmanii Kain & Schultze, 1889 (uncertain > unassessed)
412. Species Biddulphia zanzibarica A. Schmidt, 1894 (uncertain > unassessed)

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