1. Subgenus Eucythere (Eucythere) Brady, 1868
   1. Species Eucythere (Eucythere) parapubera Whatley & Downing, 1984 † accepted as Pseudeucythere parapubera (Whatley & Downing, 1984) McKenzie, Reyment & Reyment, 1993 † (new combination)
   2. Species Eucythere (Eucythere) declivis (Norman, 1865) Brady, 1868 represented as Eucythere declivis (Norman, 1865)
2. Species Eucythere alexanderi Schneider, 1939 †
3. Species Eucythere anglica Brady, 1868
4. Species Eucythere argus (Sars, 1866)
5. Species Eucythere bonnemai Deroo, 1966 †
6. Species Eucythere bonnemata Coryell, 1963 †
7. Species Eucythere brevis (Cornuel, 1846) †
8. Species Eucythere brevis Bonnema, 1940 † (accepted > unreplaced junior homonym, Homonym of Eucythere brevis (Cornuel, 1846a) (combination proposed by Sharapova, 1939a))
9. Species Eucythere brightseatensis (Berry, 1933) †
10. Species Eucythere byramensis Howe & Law, 1936 †
11. Species Eucythere calabra (Colalongo & Pasini, 1980)
12. Species Eucythere chickasawhayensis Howe, 1936 †
13. Species Eucythere circumcostata Whatley & Coles, 1987
14. Species Eucythere concinna Ciampo, 1981 †
15. Species Eucythere corrosa (Jones & Sherborn, 1888) †
16. Species Eucythere cuneata (Terquem, 1886) †
17. Species Eucythere curta Ruggieri, 1975
18. Species Eucythere danica Colin, 1988 †
19. Species Eucythere declivis (Norman, 1865)
20. Species Eucythere depressa (Terquem, 1886) †
21. Species Eucythere dinetos Ceolin & Whatley, 2015 †
22. Species Eucythere elateria Hu & Tao, 2008 †
23. Species Eucythere gibba Edwards, 1944 †
24. Species Eucythere grenettei Carbonnel, 1969 †
25. Species Eucythere hyboma Whatley & Coles, 1987
26. Species Eucythere insolita Schneider, 1971
27. Species Eucythere invisa Ciampo, 1981 †
28. Species Eucythere laevis Coles & Whatley, 1989 †
29. Species Eucythere lowei Howe, 1936 †
30. Species Eucythere macerata Bergue & Coimbra, 2008
31. Species Eucythere mackenziei Majoran, 1989 †
32. Species Eucythere minoris Suzin, 1956 †
33. Species Eucythere multipunctata Whatley & Coles, 1987
34. Species Eucythere pachythelis Hao (Yi-Chun) in Ruan & Hao (Yi-Chun), 1988
35. Species Eucythere paralaevis Coles & Whatley, 1989 †
36. Species Eucythere pittwaterensis Yassini & Jones, 1995
37. Species Eucythere prava Brady & Robertson, 1869
38. Species Eucythere pubera Bonaduce, Ciampo & Masoli, 1976
39. Species Eucythere pyramida Stephenson, 1946 †
40. Species Eucythere retiformis Ruan in Zeng, Ruan, Xu, Sun & Su, 1988
41. Species Eucythere semiglypta Swain & Brown, 1964 †
42. Species Eucythere shubutaensis Howe & Howe, 1973 †
43. Species Eucythere sohli Brouwers & Hazel, 1980 †
44. Species Eucythere sphaenoidea Hao (Yi-Chun) in Ruan & Hao (Yi-Chun), 1988
45. Species Eucythere spinescens Seguenza, 1884
46. Species Eucythere submytila Whatley & Downing, 1984 †
47. Species Eucythere sulcocostatula Ayress, 1995 †
48. Species Eucythere tamanica Schneider, 1949 †
49. Species Eucythere triangula Whatley & Coles, 1987
50. Species Eucythere triangularis Lienenklaus, 1894 †
51. Species Eucythere triangulata Puri, 1954 †
52. Species Eucythere triangulata Schneider in Nikitina & Schneider, 1966 † (accepted > unreplaced junior homonym, Homonym of Eucythere triangulata Puri, 1954)
53. Species Eucythere triordinis Schmidt, 1948 †
54. Species Eucythere undulata Klie, 1929
55. Species Eucythere viriosa Guan, 1978 †
56. Species Eucythere woodwardensis Howe, 1936 †
57. Species Eucythere yugao Yajima, 1982 †
58. Subgenus Eucythere (Rotundracythere) Mandelstam, 1958 accepted as Rotundracythere Mandelstam, 1958 (elevated to genus level)
    1. Species Eucythere (Rotundracythere) gravepuncta (Hornibrook, 1952) Swanson, 1969
    2. Species Eucythere (Rotundracythere) inaequa (Hornibrook, 1952) Eagar, 1971
    3. Species Eucythere (Rotundracythere) mytila (Hornibrook, 1952) Swanson, 1969
    4. Species Eucythere (Rotundracythere) polonezensis Blaszyk, 1987 †
    5. Species Eucythere (Rotundracythere) rotunda (Hornibrook, 1952)
    6. Species Eucythere (Rotundracythere) subovalis (Hornibrook, 1952) Swanson, 1969
    7. Species Eucythere (Rotundracythere) pseudosubovalis Whatley & Downing, 1984 † accepted as Rotundracythere pseudosubovalis (Whatley & Downing, 1984) † (unaccepted > superseded combination)
59. Species Eucythere alexanderi Brouwers & Hazel, 1978 † accepted as Eucythere sohli Brouwers & Hazel, 1980 † (unaccepted > junior objective synonym, Homonym of Eucythere alexanderi Schneider, 1939 A)
60. Species Eucythere longa Bonnema, 1940 † accepted as  † (new combination)
61. Species Eucythere parapubera Whatley & Downing, 1984 † accepted as Pseudeucythere parapubera (Whatley & Downing, 1984) McKenzie, Reyment & Reyment, 1993 † (superseded original combination)
62. Species Eucythere producta Herrig, 1963 † accepted as  † (new combination)
63. Species Eucythere solitaria Triebel, 1940 † accepted as  † (new combination)
64. Species Eucythere subpentagonalis Herrig, 1963 † accepted as  † (new combination)
65. Species Eucythere tenuis Herrig, 1963 † accepted as  † (new combination)
66. Species Eucythere westraliensis (Chapman, 1917) Sharapova, 1939 † accepted as Rostrocytheridea westraliensis (Chapman, 1917) Neale, 1975 † (superseded combination)
67. Species Eucythere gravepuncta Hornibrook, 1952 represented as Eucythere (Rotundracythere) gravepuncta (Hornibrook, 1952) Swanson, 1969
68. Species Eucythere inaequa Hornibrook, 1952 represented as Eucythere (Rotundracythere) inaequa (Hornibrook, 1952) Eagar, 1971 (superseded original combination)
69. Species Eucythere mytila Hornibrook, 1952 represented as Eucythere (Rotundracythere) mytila (Hornibrook, 1952) Swanson, 1969 (superseded original combination)
70. Species Eucythere rotunda Hornibrook, 1952 represented as Eucythere (Rotundracythere) rotunda (Hornibrook, 1952)
71. Species Eucythere subovalis Hornibrook, 1952 represented as Eucythere (Rotundracythere) subovalis (Hornibrook, 1952) Swanson, 1969

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