1. Species Cylichna acuta Tokunaga, 1906 †
2. Species Cylichna aethiopica Thiele, 1925
3. Species Cylichna africana Bartsch, 1915
4. Species Cylichna alba (T. Brown, 1827)
5. Species Cylichna altiplica (Cossmann, 1897) †
6. Species Cylichna andamanica E. A. Smith, 1904
7. Species Cylichna angistoma (Deshayes, 1824) †
8. Species Cylichna angustata (Tate & Cossmann, 1897) †
9. Species Cylichna anticingulata Ludbrook, 1958 †
10. Species Cylichna aratula (Cossmann, 1897) †
11. Species Cylichna assimilis A. Adams, 1862
12. Species Cylichna atahualpa (Dall, 1908)
13. Species Cylichna atlantica E. A. Smith, 1890
14. Species Cylichna attonsa P. P. Carpenter, 1864
15. Species Cylichna auberii (A. d'Orbigny, 1841)
16. Species Cylichna bezanconi (Morlet, 1885) †
17. Species Cylichna biplicata (A. Adams, 1850)
18. Species Cylichna bistriata (Tomlin, 1920)
19. Species Cylichna botella P. J. Fischer, 1921 †
20. Species Cylichna brocchii (Michelotti, 1847) †
21. Species Cylichna bruguierei (Deshayes, 1836) †
22. Species Cylichna bulloidea Dell, 1956
23. Species Cylichna butonensis Beets, 1942 †
24. Species Cylichna caillati (Deshayes, 1862) †
25. Species Cylichna candidula A. Adams, 1862
26. Species Cylichna caudex Harzhauser, Landau & Malaquias, 2026 †
27. Species Cylichna chevreuxi Dautzenberg, 1889
28. Species Cylichna clathrata (Defrance, 1825) †
29. Species Cylichna collyra Melvill, 1906
30. Species Cylichna consobrinoides Kuroda & Habe, 1952
31. Species Cylichna consors (Deshayes, 1862) †
32. Species Cylichna conulus (Deshayes, 1824) †
33. Species Cylichna coronata (Lamarck, 1804) †
34. Species Cylichna corticata (Møller, 1842)
35. Species Cylichna cumberlandiana (Strebel, 1908)
36. Species Cylichna cuneopsis (Cossmann, 1897) †
37. Species Cylichna cylindracea (Pennant, 1777)
38. Species Cylichna cylindroides (Deshayes, 1824) †
39. Species Cylichna dalli A. E. Verrill, 1882
40. Species Cylichna denudata (Deshayes, 1862) †
41. Species Cylichna diegensis (Dall, 1919)
42. Species Cylichna discifera Koenen, 1885 †
43. Species Cylichna discus R. B. Watson, 1883
44. Species Cylichna doliaria Hedley, 1907
45. Species Cylichna dolium Harzhauser, Landau & Malaquias, 2026 †
46. Species Cylichna dulcis Thiele, 1925
47. Species Cylichna eburnea A. E. Verrill, 1885
48. Species Cylichna elliptica (J. De C. Sowerby, 1824) †
49. Species Cylichna eschnerae Harzhauser, Landau & Malaquias, 2026 †
50. Species Cylichna euthlasta Melvill, 1918
51. Species Cylichna exigua Tenison Woods, 1879 †
52. Species Cylichna fantasma (F. Baker & G D. Hanna, 1927)
53. Species Cylichna faoensis Melvill & Standen, 1901
54. Species Cylichna gelida (E. A. Smith, 1907)
55. Species Cylichna georgiana (Strebel, 1908)
56. Species Cylichna goniophora (Deshayes, 1862) †
57. Species Cylichna gouldii (Couthouy, 1839)
58. Species Cylichna granosa (Brazier, 1877)
59. Species Cylichna granulum (R. A. Philippi, 1851)
60. Species Cylichna grovesi Á. Valdés, 2008
61. Species Cylichna heterostoma (Lowry, 1866) †
62. Species Cylichna inca (Dall, 1908)
63. Species Cylichna incisa Stephenson, 1941 †
64. Species Cylichna inedita A. Adams, 1862
65. Species Cylichna inflata Chaban, 2025
66. Species Cylichna infundibulata (Cossmann, 1897) †
67. Species Cylichna intermedia (Sacco, 1897) †
68. Species Cylichna intermissia Sohl, 1964 †
69. Species Cylichna involuta (A. Adams, 1850)
70. Species Cylichna krebsii Mörch, 1875
71. Species Cylichna latiuscula A. Adams, 1862
72. Species Cylichna lebrunii (Deshayes, 1862) †
73. Species Cylichna lemchei Bouchet & Warén, 1979
74. Species Cylichna lepidula A. Adams, 1862
75. Species Cylichna lignitarum (Cossmann, 1907) †
76. Species Cylichna luticola (C. B. Adams, 1852)
77. Species Cylichna miosimplex Harzhauser, Landau & Malaquias, 2026 †
78. Species Cylichna modesta Thiele, 1925
79. Species Cylichna morelletorum Gougerot & Le Renard, 1983 †
80. Species Cylichna multistriata H. Takeda, 1953 †
81. Species Cylichna noronyensis R. B. Watson, 1883
82. Species Cylichna obtusa Tokunaga, 1906 †
83. Species Cylichna ordinaria E. A. Smith, 1891
84. Species Cylichna orycta (R. B. Watson, 1883)
85. Species Cylichna parallela A. Adams, 1862
86. Species Cylichna paucilineata (Tate & Cossmann, 1897) †
87. Species Cylichna petiti Dautzenberg, 1923
88. Species Cylichna phanerospira (Cossmann, 1897) †
89. Species Cylichna piettei Dautzenberg & H. Fischer, 1896
90. Species Cylichna pizarro (Dall, 1908)
91. Species Cylichna pliocrassa (Sacco, 1897) †
92. Species Cylichna propecylindracea (De Gregorio, 1889)
93. Species Cylichna protracta A. A. Gould, 1859
94. Species Cylichna proxima A. Adams, 1862
95. Species Cylichna pseudoconvoluta (d'Orbigny, 1852) †
96. Species Cylichna pumila A. Adams, 1862
97. Species Cylichna quadrata P. M. Mikkelsen, 2026
98. Species Cylichna remissa E. A. Smith, 1890
99. Species Cylichna reticulata R. B. Watson, 1883
100. Species Cylichna rimata A. Adams, 1862
101. Species Cylichna secalina Shumard, 1862 †
102. Species Cylichna sectifera Cossmann, 1889 †
103. Species Cylichna serana P. J. Fischer, 1921 †
104. Species Cylichna sibogae Schepman, 1913
105. Species Cylichna steiningeri Harzhauser, Landau & Malaquias, 2026 †
106. Species Cylichna stevniensis Hansen, 2019 †
107. Species Cylichna straussi Harzhauser, Landau & Malaquias, 2026 †
108. Species Cylichna striatissima (Deshayes, 1862) †
109. Species Cylichna subbacillus Berger, 1953 †
110. Species Cylichna sublaevis (A. d'Orbigny, 1852) †
111. Species Cylichna subreticulata R. B. Watson, 1883
112. Species Cylichna tahitensis R. B. Watson, 1883
113. Species Cylichna tanyumphalos Á. Valdés, 2008
114. Species Cylichna tenuissima Thiele, 1925
115. Species Cylichna teschi P. J. Fischer, 1921 †
116. Species Cylichna thetidis Hedley, 1903
117. Species Cylichna totomiensis (Makiyama, 1927) †
118. Species Cylichna tournoueri (Peyrot, 1932) †
119. Species Cylichna triplicata (K. Martin, 1916) †
120. Species Cylichna tubulosa A. A. Gould, 1859
121. Species Cylichna verrillii Dall, 1889
122. Species Cylichna villersii (Audouin, 1826)
123. Species Cylichna vortex (Dall, 1881)
124. Species Cylichna zealandica T. W. Kirk, 1880
125. Species Cylichna brevissima (A. Adams, 1850) (uncertain > taxon inquirendum)
126. Species Cylichna calvertensis G. C. Martin, 1904 † (uncertain > unassessed)
127. Species Cylichna carinata Stephenson, 1923 † (uncertain > unassessed)
128. Species Cylichna consanguinea E. A. Smith, 1872 (uncertain > taxon inquirendum)
129. Species Cylichna costata Gabb, 1864 † (uncertain > unassessed)
130. Species Cylichna crenilabris Melvill & Standen, 1901 (uncertain > taxon inquirendum)
131. Species Cylichna diversilirata Sohl, 1964 † (uncertain > unassessed)
132. Species Cylichna dudariensis Strausz, 1966 † (uncertain > taxon inquirendum)
133. Species Cylichna ellipsoidea A. A. Gould, 1859 (uncertain > taxon inquirendum)
134. Species Cylichna erecta Hedley, 1899 (uncertain > taxon inquirendum)
135. Species Cylichna fijiensis E. A. Smith, 1872 (uncertain > taxon inquirendum)
136. Species Cylichna grandi (A. Adams) (uncertain > taxon inquirendum)
137. Species Cylichna greensboroensis G. C. Martin, 1904 † (uncertain > unassessed)
138. Species Cylichna insculpta (Totten, 1835) (uncertain > unassessed)
139. Species Cylichna jecoralis Melvill & Standen, 1903 (uncertain > unassessed)
140. Species Cylichna lacteocincta E. A. Smith, 1872 (uncertain > taxon inquirendum)
141. Species Cylichna lactuca G. Nevill & H. Nevill, 1871 (uncertain > taxon inquirendum)
142. Species Cylichna laeta A. A. Gould, 1859 (uncertain > taxon inquirendum)
143. Species Cylichna loismartinae Keen, 1943 † (uncertain > unassessed)
144. Species Cylichna melampoides A. A. Gould, 1859 (uncertain > taxon inquirendum)
145. Species Cylichna minuscula Shumard, 1862 † (uncertain > unassessed)
146. Species Cylichna minuta H. Adams, 1872 (uncertain > unassessed, use in recent literature not established by editor)
147. Species Cylichna minuta Brazier, 1877 (uncertain > taxon inquirendum, junior homonym)
148. Species Cylichna nitens E. A. Smith, 1872 (uncertain > taxon inquirendum)
149. Species Cylichna operosa A. A. Gould, 1859 (uncertain > taxon inquirendum)
150. Species Cylichna ornamenta Pálfy, 1902 † (uncertain > unassessed)
151. Species Cylichna perpusilla E. A. Smith, 1872 (uncertain > taxon inquirendum)
152. Species Cylichna pithiscus Melvill, 1904 (uncertain > unassessed)
153. Species Cylichna propinqua E. A. Smith, 1872 (uncertain > taxon inquirendum, invalid: junior primary homonym of Cylichna propinqua M. Sars, 1858)
154. Species Cylichna pumilissima E. A. Smith, 1872 (uncertain > taxon inquirendum)
155. Species Cylichna regularis A. A. Gould, 1859 (uncertain > taxon inquirendum)
156. Species Cylichna similis Thiele, 1925 (uncertain > taxon inquirendum)
157. Species Cylichna striatella Shumard, 1862 † (uncertain > unassessed)
158. Species Cylichna temblorensis Keen, 1943 † (uncertain > unassessed)
159. Species Cylichna tenuis Hedley, 1905 (uncertain > taxon inquirendum)
160. Subgenus Cylichna (Acrostemma) Cossmann, 1889 † accepted as Acrostemma Cossmann, 1889 † (unaccepted > superseded rank)
     1. Species Cylichna (Acrostemma) bezanconi (Morlet, 1885) † accepted as Cylichna bezanconi (Morlet, 1885) † (unaccepted > superseded combination)
     2. Species Cylichna (Acrostemma) coronata (Lamarck, 1804) † accepted as Cylichna coronata (Lamarck, 1804) † (unaccepted > superseded combination)
161. Subgenus Cylichna (Acrotrema) Cossmann, 1889 † accepted as Cylichna Lovén, 1846 (unaccepted > junior subjective synonym)
162. Subgenus Cylichna (Cylichnella) Gabb, 1873 accepted as Cylichnella Gabb, 1873
     1. Species Cylichna (Cylichnella) pseudoplicata Strausz, 1966 † (uncertain > taxon inquirendum)
     2. Species Cylichna (Cylichnella) durgae Beets, 1941 † accepted as Cylichnella durgae (Beets, 1941) †
     3. Species Cylichna (Cylichnella) tabogaensis A. M. Strong & Hertlein, 1939 accepted as Cylichnella tabogaensis (A. M. Strong & Hertlein, 1939)
163. Subgenus Cylichna (Cylichnina) Monterosato, 1884 accepted as Retusa T. Brown, 1827 (unaccepted > junior subjective synonym)
     1. Species Cylichna (Cylichnina) crebrisculpta (Monterosato, 1884) accepted as Retusa crebrisculpta (Monterosato, 1884) (unaccepted > superseded combination)
164. Subgenus Cylichna (Cylichnoides) Minichev, 1977 accepted as Cylichnoides Minichev, 1977 (original rank)
165. Subgenus Cylichna (Mnestia) H. Adams & A. Adams, 1854 accepted as Mnestia H. Adams & A. Adams, 1854 (original rank)
     1. Species Cylichna (Mnestia) punctosulcata E. A. Smith, 1872 (uncertain > taxon inquirendum)
     2. Species Cylichna (Mnestia) alboguttata E. A. Smith, 1872 accepted as Mnestia alboguttata (E. A. Smith, 1872) (basionym)
166. Subgenus Cylichna (Pyrunculus) Pilsbry, 1895 accepted as Pyrunculus Pilsbry, 1895
     1. Species Cylichna (Pyrunculus) floridensis Dall, 1927 accepted as Pyrunculus floridensis (Dall, 1927)
     2. Species Cylichna (Pyrunculus) medius Dall, 1927 accepted as Pyrunculus medius (Dall, 1927)
     3. Species Cylichna (Pyrunculus) rushi Dall, 1927 accepted as Pyrunculus rushi (Dall, 1927)
167. Subgenus Cylichna (Sao) H. Adams & A. Adams, 1854 accepted as Pyrunculus Pilsbry, 1895
     1. Species Cylichna (Sao) pellyi E. A. Smith, 1872 (uncertain > taxon inquirendum)
168. Subgenus Cylichna (Sphaerocylichna) Thiele, 1925 accepted as Sphaerocylichna Thiele, 1925 (unaccepted > superseded rank)
169. Subgenus Cylichna (Volvula) A. Adams, 1850 accepted as Volvulella R. B. Newton, 1891
     1. Species Cylichna (Volvula) paupercula R. B. Watson, 1883 accepted as Volvulella paupercula (R. B. Watson, 1883) (unaccepted > superseded combination)
     2. Species Cylichna (Volvula) sulcata R. B. Watson, 1883 accepted as Volvulella sulcata (R. B. Watson, 1883) accepted as Retusa sulcata (R. B. Watson, 1883) (unaccepted > superseded combination)
170. Species Cylichna acrotoma Cossmann, 1893 † accepted as Bullinella (Cylichnopsis) acrotoma (Cossmann, 1893) † (unaccepted > superseded combination)
171. Species Cylichna affinis Thiele, 1925 accepted as Cylichna tubulosa A. A. Gould, 1859
172. Species Cylichna algoensis Thiele, 1925 accepted as Cylichna tubulosa A. A. Gould, 1859
173. Species Cylichna arachis (Quoy & Gaimard, 1833) accepted as Adamnestia arachis (Quoy & Gaimard, 1833) accepted as Mnestia arachis (Quoy & Gaimard, 1833)
174. Species Cylichna arthuri Dautzenberg, 1929 accepted as Cylichna biplicata (A. Adams, 1850)
175. Species Cylichna asamusiensis Nomura, 1939 accepted as Cylichnatys angusta (A. A. Gould, 1859) (unaccepted > junior subjective synonym)
176. Species Cylichna atkinsoni Tenison Woods, 1876 accepted as Retusa atkinsoni (Tenison Woods, 1876) (original combination)
177. Species Cylichna atyoides Thiele, 1925 accepted as Sphaerocylichna atyoides (Thiele, 1925)
178. Species Cylichna bidentata (A. Orbigny, 1841) accepted as Cylichnella bidentata (A. d'Orbigny, 1841) (unaccepted > superseded combination)
179. Species Cylichna bizona (A. Adams, 1850) accepted as Ventomnestia girardi (Audouin, 1826) accepted as Mnestia girardi (Audouin, 1826)
180. Species Cylichna braunsi Yokoyama, 1920 † accepted as Cylichna biplicata (A. Adams, 1850)
181. Species Cylichna bushirensis Melvill & Standen, 1901 accepted as Scaphander bushirensis (Melvill & Standen, 1901) (original combination)
182. Species Cylichna caelata K. J. Bush, 1885 accepted as Pyrunculus caelatus (K. J. Bush, 1885) (unaccepted > superseded combination)
183. Species Cylichna candidula Locard, 1891 accepted as Retusa candidula (Locard, 1891) (Invalid: junior primary homonym of Cylichna candidula A. Adams, 1862)
184. Species Cylichna concinna E. A. Smith, 1875 accepted as Eocylichna musashiensis (Tokunaga, 1906) (invalid: junior homonym of Cylichna concinna A. Adams, 1850)
185. Species Cylichna consobrina A. Adams, 1862 accepted as Cylichna consobrinoides Kuroda & Habe, 1952 (invalid: junior homonym of Cylichna consobrina Gould, 1859)
186. Species Cylichna consobrina A. A. Gould, 1859 accepted as Cylichna alba (T. Brown, 1827) (junior subjective synonym)
187. Species Cylichna crispula R. B. Watson, 1883 accepted as Retusa crispula (R. B. Watson, 1883) (unaccepted > superseded combination)
188. Species Cylichna crossei Bucquoy, Dautzenberg & Dollfus, 1886 accepted as Retusa crossei (Bucquoy, Dautzenberg & Dollfus, 1886) (original combination)
189. Species Cylichna cuneata Tiberi, 1868 accepted as Pyrunculus hoernesi (Weinkauff, 1866) (synonym)
190. Species Cylichna cylindrica (Bruguière, 1792) accepted as Cylichna cylindracea (Pennant, 1777) (synonym)
191. Species Cylichna densistriata (Leche, 1878) accepted as Cylichnoides densistriatus (Leche, 1878)
192. Species Cylichna elongata Locard, 1886 accepted as Cylichna cylindracea (Pennant, 1777) (synonym)
193. Species Cylichna enysi F. W. Hutton, 1873 † accepted as Scaphander enysi (F. W. Hutton, 1873) † (superseded combination)
194. Species Cylichna fragilis Jeffreys, 1856 accepted as Ascobulla fragilis (Jeffreys, 1856)
195. Species Cylichna girardi (Audouin, 1826) accepted as Ventomnestia girardi (Audouin, 1826) accepted as Mnestia girardi (Audouin, 1826)
196. Species Cylichna grimaldii Dautzenberg, 1891 accepted as Haminella maltzani (Thiele, 1925) (uncertain senior synonym)
197. Species Cylichna hoernesii (Weinkauff, 1866) accepted as Pyrunculus hoernesi (Weinkauff, 1866)
198. Species Cylichna incisula Yokoyama, 1928 accepted as Liloa porcellana (A. A. Gould, 1859) (unaccepted > junior subjective synonym)
199. Species Cylichna involuta G. Nevill & H. Nevill, 1871 accepted as Acteocina involuta (G. Nevill & H. Nevill, 1871) (original combination)
200. Species Cylichna japonica A. Adams, 1862 accepted as Mnestia japonica (A. Adams, 1862) (original combination)
201. Species Cylichna javanica Schepman, 1913 accepted as Cylichna biplicata (A. Adams, 1850) (unaccepted > junior subjective synonym)
202. Species Cylichna jeffreysi (Weinkauff, 1866) accepted as Atys jeffreysi (Weinkauff, 1866) accepted as Roxaniella jeffreysi (Weinkauff, 1866) (unaccepted > superseded combination)
203. Species Cylichna kesennumaensis Nomura, 1939 accepted as Cylichnatys angusta (A. A. Gould, 1859) (unaccepted > junior subjective synonym)
204. Species Cylichna koryusyoensis Nomura, 1935 † accepted as Cylichna biplicata (A. Adams, 1850)
205. Species Cylichna labiata R. B. Watson, 1883 accepted as Osorattis dubiosa (Brazier, 1877) (unaccepted > junior subjective synonym)
206. Species Cylichna laevisculpta Granata Grillo, 1877 accepted as Retusa laevisculpta (Granata Grillo, 1877) (original combination)
207. Species Cylichna latiscula accepted as Cylichna latiuscula A. Adams, 1862 (unaccepted > misspelling - incorrect subsequent spelling)
208. Species Cylichna leptoeneilema Brusina, 1866 accepted as Retusa leptoeneilema (Brusina, 1866)
209. Species Cylichna linearis Jeffreys, 1867 accepted as Cylichna cylindracea (Pennant, 1777)
210. Species Cylichna magna Lemche, 1941 accepted as Pseudocylichna magna (Lemche, 1941) (original combination)
211. Species Cylichna mecyntea Melvill, 1912 accepted as Volvulella mecyntea (Melvill, 1912) (unaccepted > superseded combination)
212. Species Cylichna melitopolitana (N. A. Sokolov, 1899) † accepted as Retusa umbilicata (Montagu, 1803) (unaccepted > junior subjective synonym)
213. Species Cylichna mongei [sic] accepted as Cylichna mongii (Audouin, 1826) accepted as Liloa mongii (Audouin, 1826) (misspelling)
214. Species Cylichna mongii (Audouin, 1826) accepted as Liloa mongii (Audouin, 1826)
215. Species Cylichna musashiensis Yokoyama, 1920 accepted as Adamnestia japonica (A. Adams, 1862) accepted as Mnestia japonica (A. Adams, 1862) (invalid: junior homonym of Cylichna musashiensis Tokunaga, 1906)
216. Species Cylichna musashiensis Tokunaga, 1906 accepted as Eocylichna musashiensis (Tokunaga, 1906) (unaccepted > superseded combination)
217. Species Cylichna nipponensis Nomura & Hatai, 1940 accepted as Liloa nipponensis (Nomura & Hatai, 1940)
218. Species Cylichna nitidula Lovén, 1846 accepted as Cylichnina nitidula (Lovén, 1846) accepted as Retusa nitidula (Lovén, 1846) (original combination)
219. Species Cylichna nucleola (Reeve, 1855) accepted as Cylichna corticata (Møller, 1842)
220. Species Cylichna nucleolus (Reeve, 1855) accepted as Cylichna nucleola (Reeve, 1855) accepted as Cylichna corticata (Møller, 1842) (misspelling)
221. Species Cylichna obesiuscula Brugnone, 1877 † accepted as Pyrunculus ovatus (Jeffreys, 1871) (unaccepted > junior subjective synonym)
222. Species Cylichna obscura Sykes, 1904 accepted as Pyrunculus ovatus (Jeffreys, 1871) (dubious synonym)
223. Species Cylichna occulata [sic] accepted as Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842) (misspelling)
224. Species Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842)
225. Species Cylichna orientalis Yokoyama, 1920 † accepted as Mnestia japonica (A. Adams, 1862) (unaccepted > junior subjective synonym)
226. Species Cylichna oryza (Totten, 1835) accepted as Cylichnella oryza (Totten, 1835)
227. Species Cylichna ovata Jeffreys, 1871 accepted as Pyrunculus ovatus (Jeffreys, 1871) (unaccepted > superseded combination)
228. Species Cylichna ovumlacerti Guppy, 1867 † accepted as Cylichnella ovumlacerti (Guppy, 1867) † (unaccepted > superseded combination)
229. Species Cylichna parvula Jeffreys, 1883 accepted as Retusa parvula (Jeffreys, 1883) (original combination)
230. Species Cylichna paupercula R. B. Watson, 1883 accepted as Volvulella paupercula (R. B. Watson, 1883) (unaccepted > superseded combination)
231. Species Cylichna pertenuis E. A. Smith, 1875 accepted as Retusa succincta (A. Adams, 1862) (unaccepted > junior subjective synonym)
232. Species Cylichna planata P. P. Carpenter, 1864 accepted as Acteocina cerealis (A. A. Gould, 1853)
233. Species Cylichna producta (T. Brown, 1827) accepted as Cylichna cylindracea (Pennant, 1777) (synonym)
234. Species Cylichna propinqua M. Sars, 1858 accepted as Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842)
235. Species Cylichna propinqva M. Sars, 1858 accepted as Cylichna propinqua M. Sars, 1858 accepted as Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842) (original spelling)
236. Species Cylichna protumida Hedley, 1903 accepted as Retusa protumida (Hedley, 1903) (original combination)
237. Species Cylichna pygmaea (A. Adams, 1850) accepted as Retusa pygmaea (A. Adams, 1850)
238. Species Cylichna reflexa F. W. Hutton, 1885 † accepted as Volvulella reflexa (F. W. Hutton, 1885) † (superseded combination)
239. Species Cylichna richardi Dautzenberg, 1889 accepted as Mamillocylichna richardi (Dautzenberg, 1889)
240. Species Cylichna scalpta (Reeve, 1855) accepted as Cylichnoides scalptus (Reeve, 1855)
241. Species Cylichna semisulcata Dunker, 1882 accepted as Liloa porcellana (A. A. Gould, 1859) (junior subjective synonym)
242. Species Cylichna sibaensis Yamakawa, 1911 † accepted as Pyrunculus phialus (A. Adams, 1862) (unaccepted > junior subjective synonym)
243. Species Cylichna simplex Murdoch & Suter, 1906 accepted as Relichna simplex (Murdoch & Suter, 1906) accepted as Relichna murdochi (Suter, 1913)
244. Species Cylichna spreta R. B. Watson, 1897 accepted as Pyrunculus spretus (R. B. Watson, 1897) (unaccepted > superseded combination)
245. Species Cylichna stephensae A. M. Strong & Hertlein, 1939 accepted as Aliculastrum exaratum (P. P. Carpenter, 1857)
246. Species Cylichna striata F. W. Hutton, 1873 accepted as Retusa striata (F. W. Hutton, 1873) (superseded combination)
247. Species Cylichna strigella Lovén, 1846 accepted as Cylichnina umbilicata (Montagu, 1803) accepted as Retusa umbilicata (Montagu, 1803) (synonym)
248. Species Cylichna strigella (A. Adams, 1850) accepted as Cylichna biplicata (A. Adams, 1850)
249. Species Cylichna sulcata (A. d'Orbigny, 1841) accepted as Retusa sulcata (A. d'Orbigny, 1841) (unaccepted > superseded combination)
250. Species Cylichna sulcata R. B. Watson, 1883 accepted as Retusa sulcata (R. B. Watson, 1883) (unaccepted > superseded combination)
251. Species Cylichna sumatrana Thiele, 1925 accepted as Relichna sumatrana (Thiele, 1925) (original combination)
252. Species Cylichna sundaica Thiele, 1925 accepted as Cylichna biplicata (A. Adams, 1850)
253. Species Cylichna sylvaerupis G. D. Harris, 1899 † accepted as Retusa sylvaerupis (G. D. Harris, 1899) † (unaccepted > superseded combination)
254. Species Cylichna tayamaensis T. Habe, 1955 accepted as Cylichna alba (T. Brown, 1827) (unaccepted > junior subjective synonym)
255. Species Cylichna thomsoniana Wilckens, 1922 † accepted as Cylichnania thomsoniana (Wilckens, 1922) † (superseded combination)
256. Species Cylichna toyamaensis T. Habe, 1955 accepted as Retusa toyamaensis (T. Habe, 1955) (unaccepted > superseded combination)
257. Species Cylichna truncatella Locard, 1886 accepted as Retusa truncatula (Bruguière, 1792) (synonym)
258. Species Cylichna veleronis A. M. Strong & Hertlein, 1939 accepted as Aliculastrum exaratum (P. P. Carpenter, 1857)
259. Species Cylichna venustula A. Adams, 1862 accepted as Relichna venustula (A. Adams, 1862) (unaccepted > superseded combination)
260. Species Cylichna villica A. A. Gould, 1859 accepted as Mnestia villica (A. A. Gould, 1859) (superseded combination)
261. Species Cylichna volvulaeformis G. Seguenza, 1880 † accepted as Volvulella volvulaeformis (G. Seguenza, 1880) † (unaccepted > superseded combination)
262. Species Cylichna woodsii Tate, 1885 † accepted as Roxania woodsii (Tate, 1885) † (unaccepted > superseded combination)
263. Species Cylichna yamakawai Yokoyama, 1928 accepted as Cylichnatys angusta (A. A. Gould, 1859) (unaccepted > junior subjective synonym)
264. Subgenus Cylichna (Cylichnopsis) Cossmann, 1904 † represented as Cylichna Lovén, 1846
     1. Species Cylichna (Cylichnopsis) bicarinata Garvie, 2013 † (uncertain > taxon inquirendum)
     2. Species Cylichna (Cylichnopsis) goniophora (Deshayes, 1862) † accepted as Cylichna goniophora (Deshayes, 1862) † (unaccepted > superseded combination)
     3. Species Cylichna (Cylichnopsis) heterostoma (Lowry, 1866) † accepted as Cylichna heterostoma (Lowry, 1866) † (unaccepted > superseded combination)

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