1. Species Macroclinum arenaceum Michaelsen, 1924 accepted as Synoicum arenaceum (Michaelsen, 1924) (original combination)
2. Species Macroclinum arenosum (Sluiter, 1898) accepted as Polyclinum arenosum (Sluiter, 1898) (new combination)
3. Species Macroclinum calypsonis Peres, 1956 accepted as Synoicum calypsonis (Peres, 1956) (original combination)
4. Species Macroclinum crater Verrill, 1871 accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (original combination)
5. Species Macroclinum duboscqui Harant, 1927 accepted as Synoicum duboscqui (Harant, 1927) (original combination)
6. Species Macroclinum durum Sluiter, 1915 accepted as Synoicum saxeum Kott, 1998 (original combination)
7. Species Macroclinum funginum (Sluiter, 1898) accepted as Aplidium funginum (Sluiter, 1898) (new combination)
8. Species Macroclinum fungosum (Herdman, 1886) accepted as Polyclinum fungosum Herdman, 1886 (new combination)
9. Species Macroclinum galei Michaelsen, 1930 accepted as Synoicum galei (Michaelsen, 1930) (original combination)
10. Species Macroclinum hypurgon Michaelsen, 1924 accepted as Synoicum hypurgon (Michaelsen, 1924) (original combination)
11. Species Macroclinum incertum Hartmeyer, 1909 accepted as Synoicum adareanum (Herdman, 1902) (original combination)
12. Species Macroclinum insulsum (Sluiter, 1898) accepted as Synoicum insulsum (Sluiter, 1898) (new combination)
13. Species Macroclinum jordani (Ritter, 1899) accepted as Synoicum jordani (Ritter, 1899) (new combination)
14. Species Macroclinum kerguelenense Hartmeyer, 1911 accepted as Synoicum kerguelenense (Hartmeyer, 1911) (original combination)
15. Species Macroclinum lacazei Pérès, 1957 accepted as Synoicum lacazei (Pérès, 1957) (original combination)
16. Species Macroclinum macroglossum Hartmeyer, 1919 accepted as Synoicum macroglossum (Hartmeyer, 1919) (original combination)
17. Species Macroclinum magnum (Sluiter, 1906) accepted as Synoicum adareanum (Herdman, 1902) (new combination)
18. Species Macroclinum papilliferum Michaelsen, 1930 accepted as Synoicum papilliferum (Michaelsen, 1930) (original combination)
19. Species Macroclinum parfustis Ritter & Forsyth, 1917 accepted as Synoicum parfustis (Ritter & Forsyth, 1917) (original combination)
20. Species Macroclinum pellucidum Ritter & Forsyth, 1917 accepted as Synoicum pellucidum (Ritter & Forsyth, 1917) (original combination)
21. Species Macroclinum pererratum Sluiter, 1912 accepted as Aplidium radiatum (Sluiter, 1906) (original combination)
22. Species Macroclinum pomum (Sars, 1851) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (new combination)
23. Species Macroclinum pulmonaria (Ellis & Solander, 1786) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (new combination)
24. Species Macroclinum senegalense Peres, 1949 accepted as Synoicum senegalense (Peres, 1949) (original combination)
25. Species Macroclinum stewartense Michaelsen, 1924 accepted as Synoicum stewartense (Michaelsen, 1924) (original combination)
26. Species Macroclinum triplex (Sluiter, 1906) accepted as Synoicum triplex (Sluiter, 1906) (new combination)
27. Species Macroclinum diligens Sluiter, 1915 (uncertain > nomen dubium, original combination - current genus not accepted)
28. Species Macroclinum recedens Sluiter, 1915 (uncertain > nomen dubium, original combination - current genus not accepted)

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