1. Species Synapta hispida Heller, 1868
2. Species Synapta maculata (Chamisso & Eysenhardt, 1821)
3. Species Synapta abyssicola Théel, 1886 accepted as Protankyra brychia (Verrill, 1885) (synonym)
4. Species Synapta acanthia Clark, 1899 accepted as Eupatinapta acanthia (Clark, 1899)
5. Species Synapta aculeata Théel, 1886 accepted as Protankyra aculeata (Théel, 1886)
6. Species Synapta agassizii Selenka, 1867 accepted as Synapta maculata (Chamisso & Eysenhardt, 1821)
7. Species Synapta albicans Selenka, 1867 accepted as Leptosynapta albicans (Selenka, 1867)
8. Species Synapta assymmetrica Ludwig, 1875 accepted as Protankyra assymmetrica (Ludwig, 1875)
9. Species Synapta astrolabi Held, 1857 accepted as Synapta maculata (Chamisso & Eysenhardt, 1821)
10. Species Synapta autopista von Marenzeller, 1882 accepted as Protankyra autopista (von Marenzeller, 1882)
11. Species Synapta ayresii Selenka, 1867 accepted as Leptosynapta tenuis (Ayres, 1851)
12. Species Synapta bachei Ayres, 1852 (unaccepted > nomen nudum, Synaptidae unidentifiable)
13. Species Synapta bankensis Ludwig, 1875 accepted as Protankyra bankensis (Ludwig, 1875)
14. Species Synapta benedeni Ludwig, 1881 accepted as Protankyra benedeni (Ludwig, 1881)
15. Species Synapta bergensis Östergren, 1905 accepted as Leptosynapta bergensis (Östergren, 1905) (synonym)
16. Species Synapta beselii (Jaeger, 1833) accepted as Synapta maculata (Chamisso & Eysenhardt, 1821) (synonym)
17. Species Synapta bidentata Woodward & Barrett, 1858 accepted as Protankyra bidentata (Woodward & Barrett, 1858)
18. Species Synapta bifaria Semper, 1867 accepted as Leptosynapta inhaerens (O.F. Müller, 1776)
19. Species Synapta brychia Verrill, 1885 accepted as Protankyra brychia (Verrill, 1885)
20. Species Synapta buskii MacIntosh, 1866 accepted as Labidoplax buskii (MacIntosh, 1866) (synonym)
21. Species Synapta challengeri Théel, 1886 accepted as Protankyra challengeri (Théel, 1886) accepted as Rynkatorpa challengeri (Théel, 1886)
22. Species Synapta coriacea Agassiz, 1852 (unaccepted > nomen nudum)
23. Species Synapta decaria Östergren, 1905 accepted as Leptosynapta decaria (Östergren, 1905) (synonym)
24. Species Synapta digitata Montagu, 1815 accepted as Oestergrenia digitata (Montagu, 1815)
25. Species Synapta distincta von Marenzeller, 1882 accepted as Protankyra bidentata (Woodward & Barrett, 1858)
26. Species Synapta dolabrifera Stimpson, 1855 accepted as Leptosynapta dolabrifera (Stimpson, 1855)
27. Species Synapta dubia Semper, 1867 accepted as Oestergrenia dubia (Semper, 1867)
28. Species Synapta duvernaea Quatrefages, 1842 accepted as Leptosynapta inhaerens (O.F. Müller, 1776) (synonym)
29. Species Synapta galliennii Herapath, 1865 accepted as Leptosynapta galliennii (Herapath, 1865) (synonym)
30. Species Synapta girardii Pourtalès, 1851 accepted as Leptosynapta inhaerens (O.F. Müller, 1776)
31. Species Synapta glabra Semper, 1867 accepted as Opheodesoma glabra (Semper, 1867)
32. Species Synapta godeffroyi Semper, 1868 accepted as Euapta godeffroyi (Semper, 1868)
33. Species Synapta gracilis Selenka, 1867 accepted as Leptosynapta tenuis (Ayres, 1851)
34. Species Synapta grisea Semper, 1867 accepted as Opheodesoma grisea (Semper, 1867)
35. Species Synapta henslowana Gray, 1848 accepted as Leptosynapta inhaerens (O.F. Müller, 1776)
36. Species Synapta inaequalis Hutton, 1872 accepted as Rynkatorpa uncinata (Hutton, 1872)
37. Species Synapta incerta Ludwig, 1875 accepted as Oestergrenia incerta (Ludwig, 1875)
38. Species Synapta indivisa Semper, 1867 accepted as Synaptula indivisa (Semper, 1867)
39. Species Synapta innominata Ludwig, 1875 accepted as Protankyra pseudodigitata (Semper, 1867)
40. Species Synapta insolens Théel, 1886 accepted as Protankyra insolens (Théel, 1886)
41. Species Synapta johnstonii LoBianco, 1899 accepted as Oestergrenia thomsonii (Herapath, 1865)
42. Species Synapta kallipeplos Sluiter, 1887 accepted as Polyplectana kallipeplos (Sluiter, 1887)
43. Species Synapta kefersteinii Selenka, 1867 accepted as Polyplectana kefersteinii (Selenka, 1867)
44. Species Synapta lactea Sluiter, 1887 accepted as Synaptula lactea (Sluiter, 1887)
45. Species Synapta lappa J. Müller, 1850 accepted as Euapta lappa (J. Müller, 1850) (synonym)
46. Species Synapta ludwigii Sluiter, 1890 accepted as Protankyra ludwigii (Sluiter, 1890)
47. Species Synapta macrankyra Ludwig, 1898 accepted as Leptosynapta macrankyra (Ludwig, 1898) (synonym)
48. Species Synapta mammillosa Eschscholtz, 1829 accepted as Synapta maculata (Chamisso & Eysenhardt, 1821)
49. Species Synapta minuta Becher, 1906 accepted as Leptosynapta minuta (Becher, 1906) (synonym)
50. Species Synapta molesta Semper, 1867 accepted as Protankyra bidentata (Woodward & Barrett, 1858)
51. Species Synapta nigra Semper, 1867 accepted as Synaptula nigra (Semper, 1867) accepted as Polyplectana nigra (Semper, 1867)
52. Species Synapta oceanica (Lesson, 1830) accepted as Synapta maculata (Chamisso & Eysenhardt, 1821)
53. Species Synapta ooplax von Marenzeller, 1882 accepted as Patinapta ooplax (von Marenzeller, 1882)
54. Species Synapta orsinii Ludwig, 1886 accepted as Synaptula reciprocans (Forsskål, 1775)
55. Species Synapta pellucida Ayres, 1852 accepted as Leptosynapta inhaerens (O.F. Müller, 1776)
56. Species Synapta petersi Semper, 1868 accepted as Protankyra petersi (Semper, 1868)
57. Species Synapta picta Théel, 1886 accepted as Synaptula hydriformis (Lesueur, 1824)
58. Species Synapta polii Ludwig, 1875 accepted as Euapta lappa (J. Müller, 1850)
59. Species Synapta Pourtalésii Selenka, 1867 accepted as Synaptula hydriformis (Lesueur, 1824) (unaccepted > misspelling - incorrect original spelling)
60. Species Synapta psara Sluiter, 1887 accepted as Synaptula psara (Sluiter, 1887)
61. Species Synapta pseudo-digitata Semper, 1867 accepted as Protankyra pseudodigitata (Semper, 1867)
62. Species Synapta reciprocans (Forsskål, 1775) accepted as Synaptula reciprocans (Forsskål, 1775) (synonym)
63. Species Synapta recta Semper, 1867 accepted as Synaptula recta (Semper, 1867)
64. Species Synapta reticulata Semper, 1867 accepted as Synaptula reticulata (Semper, 1867)
65. Species Synapta rodea Sluiter, 1890 accepted as Protankyra rodea (Sluiter, 1890)
66. Species Synapta rotifera Pourtalès, 1851 accepted as Chiridota rotifera (Pourtalès, 1851)
67. Species Synapta sarniensis Herapath, 1865 accepted as Leptosynapta galliennii (Herapath, 1865) (synonym)
68. Species Synapta serpentina J. Müller, 1850 accepted as Opheodesoma serpentina (J. Müller, 1850)
69. Species Synapta similis Semper, 1867 accepted as Protankyra similis (Semper, 1867)
70. Species Synapta striata Sluiter, 1887 accepted as Synaptula striata (Sluiter, 1887) accepted as Synaptula recta (Semper, 1867)
71. Species Synapta tenera Norman, 1864 (unaccepted > nomen nudum)
72. Species Synapta tenuis Ayres, 1851 accepted as Leptosynapta tenuis (Ayres, 1851)
73. Species Synapta thomsonii Herapath, 1865 accepted as Oestergrenia thomsonii (Herapath, 1865)
74. Species Synapta uncinata Hutton, 1872 accepted as Rynkatorpa uncinata (Hutton, 1872)
75. Species Synapta verrilli Théel, 1886 accepted as Protankyra verrilli (Théel, 1886)
76. Species Synapta viridis Pourtalès, 1851 accepted as Synaptula hydriformis (Lesueur, 1824)
77. Species Synapta vittata (Forskål, 1775) accepted as Fistularia vittata Forsskål, 1775
78. Species Synapta fasciata Kuhl & van Hasselt in Kuhl, 1869 (uncertain > nomen dubium, Opheodesoma unidentified)
79. Species Synapta intestinalis Held, 1857 (uncertain > nomen dubium, Opheodesoma unidentified)
80. Species Synapta rappardi Held, 1857 (uncertain > nomen dubium, Synaptula unidentified)
81. Species Synapta raynaldi Held, 1857 (uncertain > nomen dubium, Opheodesoma unidentified)
82. Species Synapta zebrina Held, 1857 (uncertain > nomen dubium, Euapta unidentified)

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