1. Subgenus Cyclas (Amesoda) Rafinesque, 1820 accepted as Sphaerium (Amesoda) Rafinesque, 1820 represented as Sphaerium Scopoli, 1777
   1. Species Cyclas (Amesoda) fabale (Prime, 1852) accepted as Sphaerium fabale (Prime, 1852) (unaccepted > superseded combination)
   2. Species Cyclas (Amesoda) lasmampsis Rafinesque, 1820 accepted as Sphaerium simile (Say, 1817)
   3. Species Cyclas (Amesoda) patella A. Gould, 1850 accepted as Sphaerium patella (A. Gould, 1850) (unaccepted > superseded combination)
2. Subgenus Cyclas (Corbicula) Megerle von Mühlfeld, 1811 accepted as Corbicula Megerle von Mühlfeld, 1811 (unaccepted > superseded combination)
3. Subgenus Cyclas (Cyanocyclas) Blainville, 1818 accepted as Cyanocyclas Blainville, 1818 (original rank)
4. Subgenus Cyclas (Cyclas) Lamarck, 1798 accepted as Sphaerium Scopoli, 1777
   1. Species Cyclas (Cyclas) elevata Haldemann, 1841 accepted as Musculium partumeium (Say, 1822) accepted as Sphaerium (Musculium) partumeium (Say, 1822) represented as Sphaerium partumeium (Say, 1822) (original combination)
5. Subgenus Cyclas (Cyrena) Lamarck, 1818 accepted as Corbicula Megerle von Mühlfeld, 1811
   1. Species Cyclas (Cyrena) multidentata Anton, 1838 † accepted as Cyrena multidentata (Anton, 1838) † (unaccepted > superseded combination)
   2. Species Cyclas (Cyrena) paranacensis A. d'Orbigny, 1835 accepted as Cyanocyclas paranacensis (A. d'Orbigny, 1835) (basionym)
   3. Species Cyclas (Cyrena) variegata A. d'Orbigny, 1835 accepted as Cyanocyclas limosa (Maton, 1811)
6. Subgenus Cyclas (Phymesoda) Rafinesque, 1820 accepted as Musculium Link, 1807 accepted as Sphaerium (Musculium) Link, 1807 represented as Sphaerium Scopoli, 1777 (unaccepted > junior subjective synonym)
   1. Species Cyclas (Phymesoda) equalis Rafinesque, 1820 accepted as Pisidium dubium (Say, 1817)
7. Subgenus Cyclas (Pisidium) C. Pfeiffer, 1821 accepted as Pisidium C. Pfeiffer, 1821
   1. Species Cyclas (Pisidium) abditum Haldeman, 1841 accepted as Euglesa casertana (Poli, 1791) (unaccepted > junior subjective synonym)
   2. Species Cyclas (Pisidium) abruptum Haldeman, 1841 accepted as Pisidium dubium (Say, 1817)
   3. Species Cyclas (Pisidium) dentata Haldeman, 1841 accepted as Sphaerium striatinum (Lamarck, 1818)
8. Subgenus Cyclas (Securilla) Drouët, 1855 accepted as Musculium Link, 1807 accepted as Sphaerium (Musculium) Link, 1807 represented as Sphaerium Scopoli, 1777 (unaccepted > junior subjective synonym)
   1. Species Cyclas (Securilla) lacustris (O. F. Müller, 1774) accepted as Musculium lacustre (O. F. Müller, 1774) accepted as Sphaerium lacustre (O. F. Müller, 1774) (unaccepted > superseded combination)
9. Subgenus Cyclas (Sphaerium) Scopoli, 1777 accepted as Sphaerium Scopoli, 1777 (unaccepted combination)
   1. Species Cyclas (Sphaerium) madagascariensis Tristram, 1863 accepted as Sphaerium madagascariense (Tristram, 1863) (basionym)
10. Species Cyclas acuminata Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818) (original combination)
11. Species Cyclas aequalis A. Férussac, 1835 accepted as Pisidium dubium (Say, 1817) (incorrect subsequent spelling)
12. Species Cyclas alata Leach, 1852 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
13. Species Cyclas albula Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818) (junior synonym)
14. Species Cyclas alpina A. d'Orbigny, 1850 † accepted as Corbicula alpina (A. d'Orbigny, 1850) † (unaccepted > superseded combination)
15. Species Cyclas altilis C. B. Adams, 1847 accepted as Pisidium compressum Prime, 1852 accepted as Euglesa compressa (Prime, 1852) (unaccepted > nomen nudum)
16. Species Cyclas americana Prime, 1862 (unaccepted > nomen nudum)
17. Species Cyclas angulata J. De C. Sowerby, 1836 † accepted as Neomiodon angulatus (J. De C. Sowerby, 1836) †
18. Species Cyclas appendiculata Turton, 1831 accepted as Euglesa henslowana (Sheppard, 1825) (unaccepted > junior subjective synonym)
19. Species Cyclas aquaesextiae J. De C. Sowerby, 1829 † accepted as Sphaerium aquaesextiae (J. De C. Sowerby, 1829) † (unaccepted > superseded combination)
20. Species Cyclas aquensis Matheron, 1843 † accepted as Sphaerium gibbosum (J. De C. Sowerby, 1829) † (unaccepted > junior subjective synonym)
21. Species Cyclas argentina A. d'Orbigny, 1835 accepted as Musculium argentinum (A. d'Orbigny, 1835) accepted as Sphaerium argentinum (A. d'Orbigny, 1835) (basionym)
22. Species Cyclas asiatica E. von Martens, 1864 accepted as Sphaerium asiaticum (E. von Martens, 1864)
23. Species Cyclas aurea Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818)
24. Species Cyclas australis Lamarck, 1818 accepted as Lasaea australis (Lamarck, 1818)
25. Species Cyclas bahiensis Spix, 1827 accepted as Eupera bahiensis (Spix, 1827) (unaccepted > superseded combination)
26. Species Cyclas berellensis de Laubrière & Carez, 1881 † accepted as Pisidium berellense (de Laubrière & Carez, 1881) † (unaccepted > superseded combination)
27. Species Cyclas boissyi Deshayes, 1857 † accepted as Pisidium boissyi (Deshayes, 1857) † (unaccepted > superseded combination)
28. Species Cyclas bristovii Forbes, 1856 † accepted as Sphaerium bristovii (Forbes, 1856) † (unaccepted > superseded combination)
29. Species Cyclas brongniarti F. C. L. Koch & Dunker, 1837 † accepted as Neomiodon brongniarti (F. C. L. Koch & Dunker, 1837) † (unaccepted > superseded combination)
30. Species Cyclas brongniartina Matheron, 1843 † accepted as Corbicula cuneata (J. De C. Sowerby, 1829) † (unaccepted > junior subjective synonym)
31. Species Cyclas buchii Dunker, 1843 † accepted as Neomiodon brongniarti (F. C. L. Koch & Dunker, 1837) † (unaccepted > junior subjective synonym)
32. Species Cyclas bulbosa Prime, 1853 accepted as Sphaerium striatinum (Lamarck, 1818)
33. Species Cyclas calyculata C. B. Adams, 1842 non Draparnaud, 1805 accepted as Musculium partumeium (Say, 1822) accepted as Sphaerium (Musculium) partumeium (Say, 1822) represented as Sphaerium partumeium (Say, 1822)
34. Species Cyclas calyculata Draparnaud, 1805 accepted as Musculium lacustre (O. F. Müller, 1774) accepted as Sphaerium lacustre (O. F. Müller, 1774) (unaccepted > junior subjective synonym)
35. Species Cyclas capensis Krauss, 1848 accepted as Sphaerium capense (Krauss, 1848) (original combination)
36. Species Cyclas cardissa Prime, 1852 accepted as Musculium securis (Prime, 1852) accepted as Sphaerium securis (Prime, 1852)
37. Species Cyclas carinata Goldfuss, 1841 † accepted as Myrene angulata angulata (Roemer, 1836) † (unaccepted > junior subjective synonym)
38. Species Cyclas caroliniana Bosc, 1801 accepted as Polymesoda caroliniana (Bosc, 1801) (unaccepted > superseded combination, original combination)
39. Species Cyclas castanea Prime, 1852 accepted as Sphaerium fabale (Prime, 1852)
40. Species Cyclas chilensis A. d'Orbigny, 1846 accepted as Afropisidium chilensis (A. d'Orbigny, 1846) accepted as Euglesa chilensis (A. d'Orbigny, 1846) (basionym)
41. Species Cyclas chinensis Lamarck, 1806 accepted as Corbicula fluminea (O. F. Müller, 1774) (unaccepted > junior subjective synonym)
42. Species Cyclas citrina T. Brown, 1844 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
43. Species Cyclas coerulea Prime, 1852 accepted as Musculium partumeium (Say, 1822) accepted as Sphaerium (Musculium) partumeium (Say, 1822) represented as Sphaerium partumeium (Say, 1822)
44. Species Cyclas concentrica Bronn, 1831 † accepted as Pisidium amnicum (O. F. Müller, 1774) (unaccepted > junior subjective synonym)
45. Species Cyclas concinna J. De C. Sowerby, 1829 † accepted as Corbicula concinna (J. De C. Sowerby, 1829) † (unaccepted > superseded combination)
46. Species Cyclas consobrina Blainville, 1818 accepted as Sphaerium ovale (A. Férussac, 1807) (unaccepted > junior subjective synonym)
47. Species Cyclas constricta Prime, 1853 accepted as Musculium transversum (Say, 1829) accepted as Sphaerium transversum (Say, 1829)
48. Species Cyclas coquandiana Matheron, 1843 † accepted as Sphaerium coquandianum (Matheron, 1843) † (unaccepted > superseded combination)
49. Species Cyclas cornea (Linnaeus, 1758) accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > superseded combination)
50. Species Cyclas creplini Dunker, 1845 accepted as Musculium lacustre (O. F. Müller, 1774) accepted as Sphaerium lacustre (O. F. Müller, 1774) (unaccepted > junior subjective synonym)
51. Species Cyclas crocea J. Lewis, 1854 accepted as Musculium securis (Prime, 1852) accepted as Sphaerium securis (Prime, 1852)
52. Species Cyclas cuneata J. De C. Sowerby, 1829 † accepted as Corbicula cuneata (J. De C. Sowerby, 1829) † (unaccepted > superseded combination)
53. Species Cyclas cuneiformis J. Sowerby, 1817 † accepted as Corbicula cuneiformis (J. Sowerby, 1817) † (unaccepted > superseded combination)
54. Species Cyclas denainvilliersi de Boissy, 1848 † accepted as Eupera denainvilliersi (de Boissy, 1848) † (unaccepted > superseded combination)
55. Species Cyclas deperdita Lamarck, 1806 † accepted as Polymesoda deperdita (Lamarck, 1806) †
56. Species Cyclas depressa Nyst, 1835 † accepted as Erycina depressa (Nyst, 1835) † (unaccepted > superseded combination)
57. Species Cyclas detruncata Prime, 1852 accepted as Musculium transversum (Say, 1829) accepted as Sphaerium transversum (Say, 1829)
58. Species Cyclas distorta Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818)
59. Species Cyclas dubia Say, 1817 accepted as Pisidium dubium (Say, 1817) (original combination)
60. Species Cyclas eburnea Prime, 1853 accepted as Musculium partumeium (Say, 1822) accepted as Sphaerium (Musculium) partumeium (Say, 1822) represented as Sphaerium partumeium (Say, 1822)
61. Species Cyclas edentula Say, 1829 accepted as Sphaerium striatinum (Lamarck, 1818)
62. Species Cyclas elegans C. B. Adams, 1840 accepted as Sphaerium rhomboideum (Say, 1822)
63. Species Cyclas elevata Haldeman, 1841 accepted as Musculium partumeium (Say, 1822) accepted as Sphaerium (Musculium) partumeium (Say, 1822) represented as Sphaerium partumeium (Say, 1822) (junior synonym)
64. Species Cyclas elliptica Prime, 1869 accepted as Sphaerium simile (Say, 1817) (unaccepted > nomen nudum)
65. Species Cyclas elongata J. De C. Sowerby, 1836 † accepted as Neomiodon elongatus (J. De C. Sowerby, 1836) †
66. Species Cyclas emarginata Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818)
67. Species Cyclas erebea (Brongniart, 1823) † accepted as Corbicula erebea (Brongniart, 1823) † (unaccepted > superseded combination)
68. Species Cyclas errans Prime, 1869 accepted as Pisidium conventus Clessin, 1877 accepted as Conventus conventus (Clessin, 1877) (unaccepted > nomen nudum)
69. Species Cyclas escheri Mayer, 1865 † accepted as Pisidium escheri (Mayer, 1865) † (unaccepted > superseded combination)
70. Species Cyclas euphratica Lamarck, 1816 accepted as Corbicula fluminalis (O. F. Müller, 1774) (unaccepted > junior subjective synonym)
71. Species Cyclas fabale Prime, 1852 accepted as Sphaerium fabale (Prime, 1852) (original combination)
72. Species Cyclas ferruginea Krauss, 1848 accepted as Eupera ferruginea (Krauss, 1848) (original combination)
73. Species Cyclas flava Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818)
74. Species Cyclas flavescens Macgillivray, 1843 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
75. Species Cyclas fontainei A. d'Orbigny, 1846 accepted as Polymesoda fontainei (A. d'Orbigny, 1846) (unaccepted > superseded combination)
76. Species Cyclas fontinalis Draparnaud, 1805 accepted as Euglesa casertana (Poli, 1791) (unaccepted > junior subjective synonym)
77. Species Cyclas forbesii R. A. Philippi, 1869 accepted as Sphaerium forbesii (R. A. Philippi, 1869) (unaccepted > superseded combination)
78. Species Cyclas formosa Meek & Hayden, 1856 † accepted as Eupera formosa (Meek & Hayden, 1856) † (unaccepted > superseded combination)
79. Species Cyclas fossulata (Cornuel, 1840) † accepted as Cyrena fossulata Cornuel, 1840 † (unaccepted > superseded combination)
80. Species Cyclas fragilis Meek & Hayden, 1856 † accepted as Eupera formosa (Meek & Hayden, 1856) † (subjective synonym)
81. Species Cyclas furcata Prime, 1853 accepted as Sphaerium striatinum (Lamarck, 1818)
82. Species Cyclas galloprovincialis Matheron, 1843 † accepted as Corbicula concinna (J. De C. Sowerby, 1829) † (unaccepted > junior subjective synonym)
83. Species Cyclas gardanensis Matheron, 1843 † accepted as Corbicula gardanensis (Matheron, 1843) † (unaccepted > superseded combination)
84. Species Cyclas gargasensis Matheron, 1843 † accepted as Sphaerium aquaesextiae (J. De C. Sowerby, 1829) † (unaccepted > junior subjective synonym)
85. Species Cyclas gibbosa J. De C. Sowerby, 1829 † accepted as Sphaerium gibbosum (J. De C. Sowerby, 1829) † (unaccepted > superseded combination)
86. Species Cyclas gigantea Prime, 1852 accepted as Sphaerium simile (Say, 1817)
87. Species Cyclas globosa A. Villa & G. B. Villa, 1841 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
88. Species Cyclas globus Du Bois de Montpereux, 1831 † accepted as Erycina globus (Du Bois de Montpereux, 1831) † (unaccepted > superseded combination)
89. Species Cyclas gracilis Prime, 1852 accepted as Musculium transversum (Say, 1829) accepted as Sphaerium transversum (Say, 1829)
90. Species Cyclas hammalis Rafinesque, 1820 (unaccepted > nomen nudum)
91. Species Cyclas hartmanni Jickeli, 1874 accepted as Musculium hartmanni (Jickeli, 1874) accepted as Sphaerium hartmanni (Jickeli, 1874) (original combination)
92. Species Cyclas incurva Guppy, 1872 accepted as Sphaerium incurvum (Guppy, 1872) (original combination)
93. Species Cyclas inornata Prime, 1852 accepted as Sphaerium striatinum (Lamarck, 1818)
94. Species Cyclas islandica Bruguière, 1797 accepted as Batissa violacea (Lamarck, 1818)
95. Species Cyclas isocardioides Dupuy, 1852 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
96. Species Cyclas jayensis Prime, 1852 accepted as Musculium lacustre (O. F. Müller, 1774) accepted as Sphaerium lacustre (O. F. Müller, 1774) (synonym)
97. Species Cyclas keuperiana Quenstedt, 1852 † accepted as Pseudocorbula keuperiana (Quenstedt, 1852) † (unaccepted > superseded combination)
98. Species Cyclas laevigata Deshayes, 1824 † accepted as Eupera sublaevigata (A. d'Orbigny, 1850) † (unaccepted > junior homonym, junior homonym of Cyclas laevigata Schumacher, 1817; Cyclas sublaevigata is a replacement name)
99. Species Cyclas laevigata Schumacher, 1817 accepted as Batissa laevigata (Schumacher, 1817) (unaccepted > superseded combination)
100. Species Cyclas lauricochae R. A. Philippi, 1869 accepted as Sphaerium lauricochae (R. A. Philippi, 1869) (unaccepted > superseded combination)
101. Species Cyclas leachii A. Villa & G. B. Villa, 1841 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
102. Species Cyclas lenticularis Normand, 1844 accepted as Euglesa casertana (Poli, 1791) (unaccepted > junior subjective synonym)
103. Species Cyclas lusitanica Morelet, 1877 accepted as Sphaerium corneum (Linnaeus, 1758) (unaccepted > junior subjective synonym)
104. Species Cyclas lutea Anton, 1838 accepted as Sphaerium corneum (Linnaeus, 1758) (junior synonym)
105. Species Cyclas maculata Morelet, 1851 accepted as Eupera singleyi (Pilsbry, 1889) (invalid: junior homonym of Cyclas maculata Anton, 1837)
106. Species Cyclas maculata Anton, 1837 accepted as Eupera bahiensis (Spix, 1827) (a junior synonym)
107. Species Cyclas maiuscula Goldfuss, 1840 † accepted as Neomiodon latoovatus latoovatus (F. A. Roemer, 1836) † (junior subjective synonym)
108. Species Cyclas major J. De C. Sowerby, 1836 † accepted as Protocardia major (J. De C. Sowerby, 1836) † (unaccepted > superseded combination)
109. Species Cyclas maritima A. d'Orbigny, 1853 accepted as Polymesoda floridana (Conrad, 1846) (original combination)
110. Species Cyclas matheroni A. d'Orbigny, 1850 † (unaccepted > junior subjective synonym)
111. Species Cyclas medius J. De C. Sowerby, 1826 † (unaccepted)
112. Species Cyclas membranaceus J. De C. Sowerby, 1826 † (unaccepted > superseded combination)
113. Species Cyclas minor C. B. Adams, 1842 (unaccepted > junior subjective synonym)
114. Species Cyclas minus W. Stimpson, 1851 (unaccepted > nomen nudum)
115. Species Cyclas mirabilis Prime, 1852 (unaccepted)
116. Species Cyclas modesta Prime, 1852 (unaccepted)
117. Species Cyclas modioliformis Anton, 1837 (unaccepted, basionym)
118. Species Cyclas nana (de Koninck, 1841) † (unaccepted, not a mollusk, but a crustacean)
119. Species Cyclas nepeanensis R. P. Lesson, 1831 (unaccepted, junior synonym)
120. Species Cyclas nitida Mighels, 1842 (unaccepted > junior subjective synonym)
121. Species Cyclas nobilis A. Gould, 1855 (unaccepted > junior subjective synonym)
122. Species Cyclas normandi Michaud, 1855 † (unaccepted > superseded combination)
123. Species Cyclas nuclea de Boissy, 1848 † (unaccepted > superseded combination)
124. Species Cyclas nucleus Studer, 1820 (unaccepted, original combination)
125. Species Cyclas nummismalis Matheron, 1843 † (unaccepted > superseded combination)
126. Species Cyclas obliqua Lamarck, 1818 (unaccepted > junior subjective synonym)
127. Species Cyclas obovata J. Sowerby, 1817 † (unaccepted > superseded combination)
128. Species Cyclas obtusale Lamarck, 1818 (unaccepted, basionym)
129. Species Cyclas occidentalis J. Lewis, 1855 (unaccepted > nomen nudum)
130. Species Cyclas occidentalis J. Lewis, 1856 (unaccepted > superseded combination)
131. Species Cyclas oepfingensis Klein, 1846 † (unaccepted > superseded combination)
132. Species Cyclas orbicularia Linsley, 1845 (unaccepted > nomen nudum)
133. Species Cyclas orbicularis (Roemer, 1836) † (unaccepted > superseded combination)
134. Species Cyclas ovalis A. Férussac, 1807 (unaccepted, original combination)
135. Species Cyclas ovalis Prime, 1853 (unaccepted > junior homonym)
136. Species Cyclas ovata J. Lewis, 1856 (unaccepted > nomen nudum)
137. Species Cyclas palustris Draparnaud, 1805 (unaccepted > junior subjective synonym)
138. Species Cyclas partumeia Say, 1822 (unaccepted, original combination)
139. Species Cyclas parva J. De C. Sowerby, 1836 † (unaccepted)
140. Species Cyclas patella A. Gould, 1850 (unaccepted, original combination)
141. Species Cyclas pellucida W. Stimpson, 1851 (unaccepted)
142. Species Cyclas pisum Matheron, 1843 † (unaccepted > superseded combination)
143. Species Cyclas plumbeus A. Villa & G. B. Villa, 1841 (unaccepted > junior subjective synonym)
144. Species Cyclas ponderosa Prime, 1852 (unaccepted)
145. Species Cyclas prisca Eichwald, 1830 † (unaccepted > superseded combination)
146. Species Cyclas prominula Reuss, 1849 † (unaccepted > superseded combination)
147. Species Cyclas proserpina (Brongniart, 1823) † (unaccepted > superseded combination)
148. Species Cyclas pseudocornea Reuss, 1861 † (unaccepted > junior subjective synonym)
149. Species Cyclas pulchella A. d'Orbigny, 1835 (unaccepted, invalid: junior secondary homonym of Pisidium pulchellum Jenyns, 1832; P. dorbignyi is a replacement name)
150. Species Cyclas pulcher J. De C. Sowerby, 1826 † (unaccepted > superseded combination)
151. Species Cyclas punctifera Guppy, 1867 (unaccepted)
152. Species Cyclas quercus Prime, 1869 (unaccepted > nomen nudum)
153. Species Cyclas rhomboidea Say, 1822 (unaccepted, original combination)
154. Species Cyclas rillyensis de Boissy, 1848 † (unaccepted > superseded combination)
155. Species Cyclas rivicola Lamarck, 1818 (unaccepted, original combination)
156. Species Cyclas rosacea Prime, 1852 (unaccepted, synonym)
157. Species Cyclas rouyana A. d'Orbigny, 1850 † (unaccepted > superseded combination)
158. Species Cyclas rugosa Prime, 1869 (unaccepted > nomen nudum)
159. Species Cyclas rugosa Dunker, 1846 † (unaccepted > superseded combination)
160. Species Cyclas ryckholti Normand, 1844 (unaccepted, junior synonym)
161. Species Cyclas sarratogea Lamarck, 1818 (unaccepted)
162. Species Cyclas scaldiana Normand, 1844 (unaccepted > junior subjective synonym)
163. Species Cyclas sebetia O. G. Costa, 1830 (unaccepted, original combination)
164. Species Cyclas securis Prime, 1852 (unaccepted, original combination)
165. Species Cyclas seminulum Reuss, 1849 † (unaccepted > junior subjective synonym)
166. Species Cyclas similis Say, 1817 (unaccepted, original combination)
167. Species Cyclas simplex Prime, 1852 (unaccepted)
168. Species Cyclas solida DeKay, 1843 (unaccepted)
169. Species Cyclas solida Normand, 1844 (unaccepted > superseded combination)
170. Species Cyclas solidula Prime, 1852 (unaccepted)
171. Species Cyclas sphaerica Prime, 1853 (unaccepted)
172. Species Cyclas stagnicola Lamarck, 1822 (unaccepted > junior subjective synonym)
173. Species Cyclas staminea Conrad, 1834 (unaccepted, original combination)
174. Species Cyclas steenbuchi Møller, 1842 (unaccepted > junior subjective synonym)
175. Species Cyclas steinii A. Schmidt, 1850 (unaccepted > junior subjective synonym)
176. Species Cyclas striatina Lamarck, 1818 (unaccepted, original combination)
177. Species Cyclas strictum Normand, 1854 (unaccepted > junior subjective synonym)
178. Species Cyclas subdeperdita A. d'Orbigny, 1850 † (unaccepted > junior objective synonym)
179. Species Cyclas subdepressa A. d'Orbigny, 1850 † (unaccepted, junior subjective synonym)
180. Species Cyclas subellipticus Meek & Hayden, 1856 † (unaccepted > superseded combination, genus is a junior synonym)
181. Species Cyclas sublaevigata A. d'Orbigny, 1850 † (unaccepted > superseded combination)
182. Species Cyclas sublaevis Goldfuss, 1840 † (unaccepted, junior subjective synonym)
183. Species Cyclas subnobilis Cobălcescu, 1883 † (unaccepted > superseded combination)
184. Species Cyclas suborbicularis A. d'Orbigny, 1850 † (unaccepted)
185. Species Cyclas subpisum A. d'Orbigny, 1852 † (unaccepted > junior objective synonym)
186. Species Cyclas subquadrata J. De C. Sowerby, 1836 † (unaccepted > superseded combination, not a mollusk)
187. Species Cyclas subtrigona Dunker, 1843 † (unaccepted > superseded combination)
188. Species Cyclas sulcata Lamarck, 1818 (unaccepted)
189. Species Cyclas sulculosa Prime, 1865 (unaccepted > nomen nudum)
190. Species Cyclas tasmanica Tenison Woods, 1876 (unaccepted)
191. Species Cyclas tenuis Prime, 1852 (unaccepted > junior subjective synonym)
192. Species Cyclas tenuistriata Prime, 1852 (unaccepted)
193. Species Cyclas terveriana Dupuy, 1849 (unaccepted > junior subjective synonym)
194. Species Cyclas transversa Say, 1829 (unaccepted > superseded combination)
195. Species Cyclas triangularis Du Bois de Montpereux, 1831 † (unaccepted > superseded combination)
196. Species Cyclas triangularius Say, 1829 (unaccepted)
197. Species Cyclas truncata Linsley, 1845 (unaccepted > nomen nudum)
198. Species Cyclas truncata A. Gould, 1848 (unaccepted > junior subjective synonym)
199. Species Cyclas tumidula S. V. Wood, 1877 † (unaccepted > superseded combination)
200. Species Cyclas unguiformis de Boissy, 1848 † (unaccepted > superseded combination)
201. Species Cyclas vapincana A. d'Orbigny, 1850 † (unaccepted > superseded combination)
202. Species Cyclas veatleyi C. B. Adams, 1849 (unaccepted, original combination)
203. Species Cyclas verneuili de Boissy, 1848 † (unaccepted > superseded combination)
204. Species Cyclas vitrea Risso, 1826 (unaccepted > junior subjective synonym)
205. Species Cyclas zenonii Sacco, 1886 † (unaccepted > superseded combination)
206. Species Cyclas zeylanica Lamarck, 1806 (unaccepted)
207. Species Cyclas acuta C. Pfeiffer, 1821 (uncertain)
208. Species Cyclas ambigua Zittel, 1865 † (uncertain > taxon inquirendum)
209. Species Cyclas angulosa R. A. Philippi, 1858 (uncertain > unassessed)
210. Species Cyclas arnaudi Coquand, 1860 † (uncertain > taxon inquirendum)
211. Species Cyclas carbonaria R. A. Philippi, 1887 † (uncertain > taxon inquirendum)
212. Species Cyclas colchaguensis R. A. Philippi, 1887 † (uncertain > taxon inquirendum, not found in the literature since first description)
213. Species Cyclas egregia A. Gould, 1846 (uncertain > taxon inquirendum)
214. Species Cyclas elegans Ludwig, 1861 † (uncertain > taxon inquirendum)
215. Species Cyclas faba Münster, 1841 † (uncertain > nomen dubium)
216. Species Cyclas gregaria Zittel, 1865 † (uncertain > taxon inquirendum)
217. Species Cyclas jugleri Dunker, 1843 † (uncertain > taxon inquirendum)
218. Species Cyclas neocomensis Cornuel, 1874 † (uncertain > taxon inquirendum)
219. Species Cyclas obuncula Ludwig, 1861 † (uncertain > taxon inquirendum)
220. Species Cyclas phaseolina R. A. Philippi, 1887 † (uncertain > taxon inquirendum, not found in the literature since first description)
221. Species Cyclas pusilla Coquand, 1860 † (uncertain > taxon inquirendum)
222. Species Cyclas sphaeriiformis Gourret, 1884 † (uncertain > taxon inquirendum)
223. Species Cyclas striata R. A. Philippi, 1887 † (uncertain > taxon inquirendum, not found in the literature since first description)
224. Species Cyclas sulcata Anton, 1838 (uncertain > nomen dubium, invalid; not Lamarck, 1818)
225. Species Cyclas umbonata Anton, 1838 † (uncertain > taxon inquirendum)
226. Species Cyclas ustuertensis Eichwald, 1841 † (uncertain > taxon inquirendum)
227. Species Cyclas zonata R. A. Philippi, 1887 † (uncertain > taxon inquirendum, not found in the literature since first description)

The webpage text is licensed under a Creative Commons Attribution 4.0 License