1. Species Lyonsiella abyssicola (G. O. Sars, 1872)
2. Species Lyonsiella angulosa Simone, 2024
3. Species Lyonsiella aotearoa Dell, 1995
4. Species Lyonsiella curta Poutiers, 1984
5. Species Lyonsiella fragilis J. A. Allen & J. F. Turner, 1974
6. Species Lyonsiella frielei J. A. Allen & J. F. Turner, 1974
7. Species Lyonsiella galatheae (Knudsen, 1970)
8. Species Lyonsiella horrida (J. A. Allen & J. F. Turner, 1974)
9. Species Lyonsiella illaesa Machado & Sigwart, 2024
10. Species Lyonsiella magnifica Dall, 1913
11. Species Lyonsiella magnifica Dall, 1923 (accepted > unreplaced junior homonym)
12. Species Lyonsiella pacifica Dall, 1908
13. Species Lyonsiella parva Okutani, 1962
14. Species Lyonsiella perplexa J. A. Allen & J. F. Turner, 1974
15. Species Lyonsiella pipoca Oliveira & Absalão, 2010
16. Species Lyonsiella quadrata Hedley, 1907
17. Species Lyonsiella quaylei F. R. Bernard, 1969
18. Species Lyonsiella sinuosa (Jeffreys, 1882)
19. Species Lyonsiella smidti Friele, 1886
20. Species Lyonsiella subquadrata (Jeffreys, 1882)
21. Species Lyonsiella tentaculata L. I. Pacheco, Teso & Pastorino, 2024
22. Subgenus Lyonsiella (Policordia) Dall, Bartsch & Rehder, 1938 accepted as Policordia Dall, Bartsch & Rehder, 1938
    1. Species Lyonsiella (Policordia) uschakovi Gorbunov, 1946 accepted as Policordia uschakovi (Gorbunov, 1946)
23. Species Lyonsiella abscissa Pelseneer, 1911 accepted as Laevicordia abscissa (Pelseneer, 1911) (original combination)
24. Species Lyonsiella agulhasensis Jaeckel & Thiele, 1931 accepted as Thracidora agulhasensis (Jaeckel & Thiele, 1931)
25. Species Lyonsiella alaskana Dall, 1895 accepted as Policordia alaskana (Dall, 1895) (original combination)
26. Species Lyonsiella angelika K. Linse, 2002 accepted as Policordia angelika (K. Linse, 2002) (unaccepted > superseded combination)
27. Species Lyonsiella atlantica (J. A. Allen & J. F. Turner, 1974) accepted as Policordia atlantica J. A. Allen & J. F. Turner, 1974 (unaccepted > superseded combination)
28. Species Lyonsiella compressa (Locard, 1898) accepted as Mytilimeria compressa Locard, 1898
29. Species Lyonsiella cordata A. E. Verrill & K. J. Bush, 1898 accepted as Policordia cordata (A. E. Verrill & K. J. Bush, 1898) (unaccepted > superseded combination)
30. Species Lyonsiella elegans (Jaeckel & Thiele, 1931) accepted as Allogramma elegans (Jaeckel & Thiele, 1931)
31. Species Lyonsiella formosa (Jeffreys, 1882) accepted as Allogramma formosa (Jeffreys, 1882)
32. Species Lyonsiella freilei [sic] accepted as Lyonsiella frielei J. A. Allen & J. F. Turner, 1974 (misspelling)
33. Species Lyonsiella gemma A. E. Verrill, 1880 accepted as Policordia gemma (A. E. Verrill, 1880) (unaccepted > superseded combination)
34. Species Lyonsiella grandis E. A. Smith, 1885 accepted as Policordia grandis (E. A. Smith, 1885) (original combination)
35. Species Lyonsiella granulifera (A. E. Verrill, 1885) accepted as Verticordia granulifera (A. E. Verrill, 1885)
36. Species Lyonsiella insculpta (Jeffreys, 1882) accepted as Policordia gemma (A. E. Verrill, 1880)
37. Species Lyonsiella japonica Habe, 1961 accepted as Policordia pilula (Pelseneer, 1911)
38. Species Lyonsiella jeffreysi Friele, 1879 accepted as Policordia jeffreysi (Friele, 1879)
39. Species Lyonsiella jeffreysi [sic] accepted as Lyonsiella jeffreysii E. A. Smith, 1885 accepted as Lyonsiella smidti Friele, 1886 (incorrect subsequent spelling of Lyonsiella jeffreysii E.A. Smith, 1885)
40. Species Lyonsiella jeffreysii E. A. Smith, 1885 accepted as Lyonsiella smidti Friele, 1886
41. Species Lyonsiella media Okutani, 1962 accepted as Policordia media (Okutani, 1962) (unaccepted > superseded combination)
42. Species Lyonsiella murrayi Knudsen, 1967 accepted as Policordia murrayi (Knudsen, 1967)
43. Species Lyonsiella papyracea E. A. Smith, 1885 accepted as Policordia papyracea (E. A. Smith, 1885) (original combination)
44. Species Lyonsiella pilula Pelseneer, 1911 accepted as Policordia pilula (Pelseneer, 1911)
45. Species Lyonsiella pilula Prashad, 1932 accepted as Policordia pilula (Pelseneer, 1911)
46. Species Lyonsiella planulata Thiele, 1912 accepted as Lyonsia arcaeformis E. von Martens, 1885
47. Species Lyonsiella radiata Dall, 1889 accepted as Policordia radiata (Dall, 1889)
48. Species Lyonsiella smithi Dautzenberg, 1927 accepted as Lyonsiella smidti Friele, 1886
49. Species Lyonsiella smithi Prashad, 1932 accepted as Lyonsiella abscissa Pelseneer, 1911 accepted as Laevicordia abscissa (Pelseneer, 1911) (junior homonym of Lyonsiella smithi Dautzenberg, 1927)
50. Species Lyonsiella uschakovi Gorbunov, 1946 accepted as Policordia uschakovi (Gorbunov, 1946) (basionym)
51. Species Lyonsiella compressa J. A. Allen & J. F. Turner, 1974 (uncertain > taxon inquirendum)

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