1. Species Microcosmus albidus Michaelsen, 1904
2. Species Microcosmus anchylodeirus Traustedt, 1883
3. Species Microcosmus anomalocarpus Millar, 1988
4. Species Microcosmus arenaceus Sluiter, 1904
5. Species Microcosmus australis Herdman, 1898
6. Species Microcosmus bitunicatus Monniot F. & Monniot C., 2001
7. Species Microcosmus claudicans (Savigny, 1816)
8. Species Microcosmus curvus Tokioka, 1954
9. Species Microcosmus exasperatus Heller, 1878
10. Species Microcosmus glacialis (Sars, 1859)
11. Species Microcosmus hartmeyeri Oka, 1906
12. Species Microcosmus helleri Herdman, 1881
13. Species Microcosmus hernius (Monniot C. & Monniot F., 1973)
14. Species Microcosmus hirsutus Sluiter, 1900
15. Species Microcosmus longicloa Monniot C. & Monniot F., 1991
16. Species Microcosmus madagascariensis Michaelsen, 1918
17. Species Microcosmus miniaceus Sluiter, 1900
18. Species Microcosmus multiplicatus Tokioka, 1952
19. Species Microcosmus multitentaculatus Tokioka, 1953
20. Species Microcosmus nudistigma Monniot C., 1962
21. Species Microcosmus oligophyllus Heller, 1878
22. Species Microcosmus pacificus Monniot F. & Monniot C., 2001
23. Species Microcosmus planus Kott, 1975
24. Species Microcosmus polymorphus Heller, 1877
25. Species Microcosmus propinquus Herdman, 1881
26. Species Microcosmus psammiferus Monniot C., Monniot F., Griffiths & Schleyer, 2001
27. Species Microcosmus pupa (Savigny, 1816)
28. Species Microcosmus sabatieri Roule, 1885
29. Species Microcosmus santoensis Monniot F. & Monniot C., 2003
30. Species Microcosmus savignyi Monniot C., 1962
31. Species Microcosmus senegalensis Michaelsen, 1915
32. Species Microcosmus squamiger Michaelsen, 1927
33. Species Microcosmus stoloniferus Kott, 1952
34. Species Microcosmus trigonimus Millar, 1955
35. Species Microcosmus tuberculatus Kott, 1985
36. Species Microcosmus vesiculosus Monniot F. & Monniot C., 2001
37. Species Microcosmus vulgaris Heller, 1877
38. Species Microcosmus acanthifera Hartmeyer, 1909 accepted as Cnemidocarpa verrucosa (Lesson, 1830) (original combination)
39. Species Microcosmus affinis Heller, 1878 accepted as Microcosmus claudicans (Savigny, 1816) (original combination)
40. Species Microcosmus agglutinans Hartmeyer, 1919 accepted as Microcosmus madagascariensis Michaelsen, 1918 (original combination)
41. Species Microcosmus biconvolutus Sluiter, 1898 accepted as Microcosmus exasperatus Heller, 1878 (original combination)
42. Species Microcosmus coalitus Sluiter, 1898 accepted as Pyura stolonifera (Heller, 1878) (original combination)
43. Species Microcosmus confluxa Sluiter, 1912 accepted as Molgula enodis (Sluiter, 1912) (literature misspelling)
44. Species Microcosmus confluxus Sluiter, 1912 accepted as Molgula enodis (Sluiter, 1912) (original combination)
45. Species Microcosmus distans Heller, 1878 accepted as Microcosmus exasperatus Heller, 1878 (original combination)
46. Species Microcosmus draschi Herdman, 1891 accepted as Herdmania grandis (Heller, 1878) (literature misspelling)
47. Species Microcosmus draschii Herdman, 1891 accepted as Herdmania grandis (Heller, 1878) (original combination)
48. Species Microcosmus echinatus (Linnaeus, 1767) accepted as Boltenia echinata (Linnaeus, 1767) (new combination)
49. Species Microcosmus formosa (Herdman, 1882) accepted as Hartmeyeria formosa (Herdman, 1881)
50. Species Microcosmus goanus Michaelsen, 1918 accepted as Microcosmus helleri Herdman, 1881 (original combination)
51. Species Microcosmus haemisphaerium Sluiter, 1904 accepted as Microcosmus exasperatus Heller, 1878 (original combination)
52. Species Microcosmus herdmani Drasche, 1884 accepted as Pyura herdmani (Drasche, 1884) (original combination)
53. Species Microcosmus herdmanii Drasche, 1884 accepted as Pyura herdmani (Drasche, 1884) (literature misspelling)
54. Species Microcosmus julinii Drasche, 1884 accepted as Herdmania grandis (Heller, 1878) (original combination)
55. Species Microcosmus kura Brewin, 1948 accepted as Microcosmus australis Herdman, 1898 (original combination)
56. Species Microcosmus manaarensis Herdman, 1906 accepted as Microcosmus helleri Herdman, 1881 (original combination)
57. Species Microcosmus miniatus Verrill, 1900 accepted as Microcosmus exasperatus Heller, 1878 (original combination)
58. Species Microcosmus mirabilis (Drasche, 1884) accepted as Herdmania mirabilis (Drasche, 1884) (new combination)
59. Species Microcosmus nacreus Van Name, 1912 accepted as Microcosmus glacialis (Sars, 1859) (original combination)
60. Species Microcosmus nichollsi Kott, 1952 accepted as Microcosmus propinquus Herdman, 1881 (original combination)
61. Species Microcosmus pedunculatus Pérès, 1951 accepted as Hartmeyeria hupferi (Hartmeyer, 1909) (original combination)
62. Species Microcosmus ramsayi Herdman, 1899 accepted as Microcosmus australis Herdman, 1898 (original combination)
63. Species Microcosmus scrotum (Delle Chiaje, 1828) accepted as Microcosmus sabatieri Roule, 1885 (new combination)
64. Species Microcosmus spinifera (Herdman, 1899) accepted as Hartmeyeria formosa (Herdman, 1881) (literature misspelling)
65. Species Microcosmus spiniferus (Herdman, 1899) accepted as Hartmeyeria formosa (Herdman, 1881) (new combination)
66. Species Microcosmus spinosus Lacaze-Duthiers & Delage, 1892 accepted as Microcosmus claudicans (Savigny, 1816) (original combination)
67. Species Microcosmus spirifer (Herdman, 1899) accepted as Cnemidocarpa verrucosa (Lesson, 1830) (new combination)
68. Species Microcosmus stolonifera Kott, 1952 accepted as Microcosmus stoloniferus Kott, 1952 (incorrect original spelling)
69. Species Microcosmus sulcatus (Coquebert, 1797) accepted as Microcosmus vulgaris Heller, 1877 (new combination)
70. Species Microcosmus transversus Ritter, 1907 accepted as Pyura mirabilis (Drasche, 1884) (original combination)
71. Species Microcosmus triangularis (Ritter, 1913) accepted as Hartmeyeria triangularis Ritter, 1913 (new combination)
72. Species Microcosmus variegatus Heller, 1878 accepted as Microcosmus exasperatus Heller, 1878 (original combination)
73. Species Microcosmus solanoides (Herdman, 1899) (uncertain > nomen dubium)

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