1. Species Synoicum adareanum (Herdman, 1902)
2. Species Synoicum angustum Kott, 1992
3. Species Synoicum apectetum Millar, 1982
4. Species Synoicum arenaceum (Michaelsen, 1924)
5. Species Synoicum atlanticum Millar, 1968
6. Species Synoicum atopogaster Kott, 1963
7. Species Synoicum australe Millar, 1962
8. Species Synoicum beauchampi (Harant, 1927)
9. Species Synoicum blochmanni (Heiden, 1894)
10. Species Synoicum bowerbanki Millar, 1963
11. Species Synoicum buccinum Kott, 1992
12. Species Synoicum calypsonis (Peres, 1956)
13. Species Synoicum capense Millar, 1962
14. Species Synoicum castellatum Kott, 1992
15. Species Synoicum chrysanthemum Kott, 1992
16. Species Synoicum citrum Kott, 1992
17. Species Synoicum clavatum (Oka, 1927)
18. Species Synoicum concavitum Kott, 1992
19. Species Synoicum cymosum Redikorzev, 1927
20. Species Synoicum daucum Monniot C. & Monniot F., 1977
21. Species Synoicum derjugini Redikorzev, 1927
22. Species Synoicum diaphanum Sluiter, 1927
23. Species Synoicum duboscqui (Harant, 1927)
24. Species Synoicum erectum Kott, 1992
25. Species Synoicum floriferum Monniot F. & Monniot C., 2006
26. Species Synoicum galei (Michaelsen, 1930)
27. Species Synoicum georgianum Sluiter, 1932
28. Species Synoicum haurakiensis Brewin, 1951
29. Species Synoicum herdmani Brewin, 1956
30. Species Synoicum howei Monniot C. & Monniot F., 1988
31. Species Synoicum hypurgon (Michaelsen, 1924)
32. Species Synoicum implicatum Kott, 2008
33. Species Synoicum incrustatum (Sars, 1851)
34. Species Synoicum insulsum (Sluiter, 1898)
35. Species Synoicum intercedens (Sluiter, 1909)
36. Species Synoicum irregulare Ritter, 1899
37. Species Synoicum jordani (Ritter, 1899)
38. Species Synoicum kerguelenense (Hartmeyer, 1911)
39. Species Synoicum kincaidi (Ritter, 1899)
40. Species Synoicum kuranui Brewin, 1950
41. Species Synoicum laboutei Monniot F. & Monniot C., 2006
42. Species Synoicum lacazei (Pérès, 1957)
43. Species Synoicum longistriatum Kott, 1992
44. Species Synoicum macroglossum (Hartmeyer, 1919)
45. Species Synoicum molle (Herdman, 1886)
46. Species Synoicum obscurum Kott, 1992
47. Species Synoicum occidentalis Millar, 1982
48. Species Synoicum ostentor Monniot C. & Monniot F., 1983
49. Species Synoicum otagoensis Millar, 1982
50. Species Synoicum papilliferum (Michaelsen, 1930)
51. Species Synoicum parfustis (Ritter & Forsyth, 1917)
52. Species Synoicum partitionis Monniot F., 1987
53. Species Synoicum parvum Redikorzev, 1937
54. Species Synoicum pellucens Redikorzev, 1927
55. Species Synoicum pellucidum (Ritter & Forsyth, 1917)
56. Species Synoicum pererratum (Sluiter, 1912)
57. Species Synoicum polygyna Monniot C. & Monniot F., 1980
58. Species Synoicum polyzoinum Sanamyan & Sanamyan, 2017
59. Species Synoicum pomum (Sars, 1851)
60. Species Synoicum pribilovense (Ritter, 1899)
61. Species Synoicum prunum (Herdman, 1899)
62. Species Synoicum pseudogrisiatum Kott, 2008
63. Species Synoicum pulmonaria (Ellis & Solander, 1786)
64. Species Synoicum ramulosum Kott, 1969
65. Species Synoicum rapum Kott, 2008
66. Species Synoicum sabuliferum Redikorzev, 1937
67. Species Synoicum sacculum Kott, 1992
68. Species Synoicum sagamianum Tokioka, 1962
69. Species Synoicum salivum Monniot F. & Gaill, 1978
70. Species Synoicum saxeum Kott, 1998
71. Species Synoicum senegalense (Peres, 1949)
72. Species Synoicum solidum Redikorzev, 1937
73. Species Synoicum sphinctorum Kott, 2006
74. Species Synoicum stewartense (Michaelsen, 1924)
75. Species Synoicum suarenum Kott, 1992
76. Species Synoicum syrtis Kott, 2006
77. Species Synoicum tentaculatum Kott, 1969
78. Species Synoicum triplex (Sluiter, 1906)
79. Species Synoicum tropicum (Sluiter, 1909)
80. Species Synoicum turgens Phipps, 1774
81. Species Synoicum vesica Kott, 2008
82. Species Synoicum vibei Lützen, 1959
83. Species Synoicum appendiculatum Michaelsen, 1923 accepted as Morchellium appendiculatum (Michaelsen, 1923) (original combination)
84. Species Synoicum californianum Brunetti, 2007 accepted as Ritterella rubra Abbott & Trason, 1968 (synonym)
85. Species Synoicum circumvolutum Kott, 1954 accepted as Aplidium irregulare (Herdman, 1886) (original combination)
86. Species Synoicum citrinum Monniot F. & Monniot C., 2006 accepted as Pseudodistoma citrinum Monniot F. & Monniot C., 2006 (synonym)
87. Species Synoicum durum Kott, 1992 accepted as Synoicum saxeum Kott, 1998 (junior homonym)
88. Species Synoicum fungosum (Herdman, 1886) accepted as Polyclinum fungosum Herdman, 1886 (new combination)
89. Species Synoicum georgiana Sluiter, 1932 accepted as Synoicum georgianum Sluiter, 1932 (literature misspelling)
90. Species Synoicum giardi (Herdman, 1886) accepted as Morchellium giardi Herdman, 1886 (synonym)
91. Species Synoicum haeckeli (Gottschaldt, 1894) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (new combination)
92. Species Synoicum haeckli (Gottschaldt, 1894) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (literature misspelling)
93. Species Synoicum investum Kott, 1963 accepted as Aplidium solidum (Ritter & Forsyth, 1917) (original combination)
94. Species Synoicum jacobsoni Redikorzev, 1927 accepted as Synoicum jordani (Ritter, 1899) (original combination)
95. Species Synoicum kinkaidi (Ritter, 1899) accepted as Synoicum kincaidi (Ritter, 1899) (misspelling)
96. Species Synoicum kohli Sluiter, 1932 accepted as Synoicum georgianum Sluiter, 1932 (original combination)
97. Species Synoicum maroccanum Sluiter, 1927 accepted as Aplidium maroccanum (Sluiter, 1927) (original combination)
98. Species Synoicum pachydermatinum (Jacobson, 1892) accepted as Aplidium glabrum (Verrill, 1871) (new combination)
99. Species Synoicum pyriformis (Herdman, 1886) accepted as Aplidiopsis pyriformis (Herdman, 1886) (new combination)
100. Species Synoicum rubrum (Abbott & Trason, 1968) accepted as Ritterella rubra Abbott & Trason, 1968 (pre-occupied)
101. Species Synoicum snodgrassi (Ritter, 1899) accepted as Synoicum kincaidi (Ritter, 1899)
102. Species Synoicum steineni Michaelsen, 1907 accepted as Synoicum adareanum (Herdman, 1902) (original combination)
103. Species Synoicum stewartensis (Michaelsen, 1924) accepted as Synoicum stewartense (Michaelsen, 1924)
104. Species Synoicum suesanum Michaelsen, 1919 accepted as Synoicum intercedens (Sluiter, 1909) (original combination)
105. Species Synoicum tentucalatum Kott, 1969 accepted as Synoicum tentaculatum Kott, 1969

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