1. Species Seguenzia antarctica Thiele, 1925
2. Species Seguenzia balicasagensis Poppe, Tagaro & H. Dekker, 2006
3. Species Seguenzia beloni Poppe, Tagaro & H. Dekker, 2006
4. Species Seguenzia cervola Dall, 1919
5. Species Seguenzia chariessa B. A. Marshall, 1991
6. Species Seguenzia chelina B. A. Marshall, 1983
7. Species Seguenzia compta B. A. Marshall, 1983
8. Species Seguenzia conopia B. A. Marshall, 1983
9. Species Seguenzia costulifera Schepman, 1909
10. Species Seguenzia dabfari Poppe, Tagaro & H. Dekker, 2006
11. Species Seguenzia dautzenbergi Schepman, 1909
12. Species Seguenzia donaldi Ladd, 1982 †
13. Species Seguenzia eidalima B. A. Marshall, 1991
14. Species Seguenzia elegans Jeffreys, 1885
15. Species Seguenzia elegantissima Poppe, Tagaro & H. Dekker, 2006
16. Species Seguenzia emmeles B. A. Marshall, 1991
17. Species Seguenzia engonia B. A. Marshall, 1991
18. Species Seguenzia eritima A. E. Verrill, 1884
19. Species Seguenzia eutyches B. A. Marshall, 1991
20. Species Seguenzia fatigans Barnard, 1963
21. Species Seguenzia floridana Dall, 1927
22. Species Seguenzia formosa Jeffreys, 1876
23. Species Seguenzia fulgida B. A. Marshall, 1983
24. Species Seguenzia giovia Dall, 1919
25. Species Seguenzia glabella B. A. Marshall, 1983 †
26. Species Seguenzia hapala Woodring, 1928
27. Species Seguenzia hosyu Habe, 1953
28. Species Seguenzia iota B. A. Marshall, 1991
29. Species Seguenzia keikoae Poppe, Tagaro & H. Dekker, 2006
30. Species Seguenzia levii B. A. Marshall, 1991
31. Species Seguenzia lineata R. B. Watson, 1879
32. Species Seguenzia louiseae A. H. Clarke, 1961
33. Species Seguenzia macleani D. L. Geiger, 2017
34. Species Seguenzia matara B. A. Marshall, 1988
35. Species Seguenzia metivieri B. A. Marshall, 1991
36. Species Seguenzia mirabilis Okutani, 1964
37. Species Seguenzia monocingulata G. Seguenza, 1876 †
38. Species Seguenzia nipponica Okutani, 1964
39. Species Seguenzia nitida A. E. Verrill, 1884
40. Species Seguenzia occidentalis Dall, 1908
41. Species Seguenzia orientalis Thiele, 1925
42. Species Seguenzia platamodes B. A. Marshall, 1991
43. Species Seguenzia praeceps B. A. Marshall, 1991
44. Species Seguenzia prisca B. A. Marshall, 1983 †
45. Species Seguenzia propheta Lozouet, 1999 †
46. Species Seguenzia richeri B. A. Marshall, 1991
47. Species Seguenzia serrata B. A. Marshall, 1983 †
48. Species Seguenzia statiana Sosso, Bertolaso & Dell'Angelo, 2020 †
49. Species Seguenzia stegastris B. A. Marshall, 1991
50. Species Seguenzia stephanica Dall, 1908
51. Species Seguenzia sumatrensis Thiele, 1925
52. Species Seguenzia textilis B. A. Marshall, 1983
53. Species Seguenzia transenna B. A. Marshall, 1983
54. Species Seguenzia triteia Salvador, Cavallari & Simone, 2014
55. Species Seguenzia trochiformis Poppe, Tagaro & H. Dekker, 2006
56. Species Seguenzia wareni B. A. Marshall, 1991
57. Species Seguenzia caliana Dall, 1919 accepted as Seguenzia stephanica Dall, 1908
58. Species Seguenzia carinata Jeffreys, 1877 accepted as Carenzia carinata (Jeffreys, 1877) (superseded combination)
59. Species Seguenzia cazioti Dautzenberg, 1925 accepted as Quinnia cazioti (Dautzenberg, 1925) (superseded combination)
60. Species Seguenzia certoma Dall, 1919 accepted as Seguenzia stephanica Dall, 1908
61. Species Seguenzia ionica R. B. Watson, 1878 accepted as Quinnia ionica (R. B. Watson, 1878) (superseded combination)
62. Species Seguenzia laxa Jeffreys, 1885 accepted as Haloceras laxa (Jeffreys, 1885) accepted as Haloceras laxum (Jeffreys, 1885)
63. Species Seguenzia megaloconcha Rokop, 1972 accepted as Seguenzia cervola Dall, 1919
64. Species Seguenzia melvilli Schepman, 1909 accepted as Carenzia melvilli (Schepman, 1909)
65. Species Seguenzia polita Verco, 1906 accepted as Quinnia polita (Verco, 1906) (superseded combination)
66. Species Seguenzia quinni J. H. McLean, 1985 accepted as Seguenzia giovia Dall, 1919
67. Species Seguenzia radialis Tate, 1890 † accepted as Basilissa radialis (Tate, 1890) † accepted as Ancistrobasis radialis (Tate, 1890) †
68. Species Seguenzia reticulata (R. A. Philippi, 1844) accepted as Ancistrobasis reticulata (R. A. Philippi, 1844) (unaccepted > superseded combination)
69. Species Seguenzia rushi Dall, 1927 accepted as Quinnia rushi (Dall, 1927) (superseded combination)
70. Species Seguenzia siberutensis Thiele, 1925 accepted as Halystina siberutensis (Thiele, 1925)
71. Species Seguenzia simplex Barnard, 1963 accepted as Halystina simplex (Barnard, 1963) (superseded combination)
72. Species Seguenzia soyoae (Okutani, 1964) accepted as Basilissa soyoae Okutani, 1964
73. Species Seguenzia sykesi Schepman, 1909 accepted as Quinnia sykesi (Schepman, 1909)
74. Species Seguenzia tricarinata Jeffreys, 1885 accepted as Haloceras tricarinatum (Jeffreys, 1885)
75. Species Seguenzia trispinosa R. B. Watson, 1879 accepted as Carenzia trispinosa (R. B. Watson, 1879) (superseded combination)

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