1. Species Acrochaetium alariae (Jónsson) Bornet, 1904
2. Species Acrochaetium battersianum Hamel, 1927
3. Species Acrochaetium brebneri (Batters) Hamel, 1928
4. Species Acrochaetium catenulatum M.Howe, 1914
5. Species Acrochaetium endozoicum (Darbishire) Batters, 1902
6. Species Acrochaetium humile (Rosenvinge) Børgesen, 1915
7. Species Acrochaetium immersum (Rosenvinge) Hamel, 1927
8. Species Acrochaetium irregulare (Reinsch)
9. Species Acrochaetium kuckuckianum Hamel, 1927
10. Species Acrochaetium lorrain-smithiae (Lyle) L.Newton, 1931
11. Species Acrochaetium microfilum C.-C.Jao, 1936
12. Species Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858
13. Species Acrochaetium moniliforme (Rosenvinge) Børgesen, 1915
14. Species Acrochaetium pallens (Zanardini) Nägeli, 1862
15. Species Acrochaetium parvulum (Kylin) Hoyt, 1920
16. Species Acrochaetium sanctae-mariae (Darbishire) Hamel, 1927
17. Species Acrochaetium scapae (Lyle) Papenfuss, 1945
18. Species Acrochaetium secundatum (Lyngbye) Nägeli, 1858
19. Species Acrochaetium seiriolanum (Harvey-Gibson) Hamel, 1927
20. Species Acrochaetium sparsum (Harvey) Nägeli, 1862
21. Species Acrochaetium stilophorae (Levring) Kylin, 1944
22. Species Acrochaetium unifilum C.-C.Jao, 1936
23. Species Acrochaetium attenuatum (Rosenvinge) Hamel, 1927 accepted as Colaconema attenuatum (Rosenvinge) R.Nielsen, 1994 accepted as Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914
24. Species Acrochaetium codii Hamel, 1927 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 (synonym)
25. Species Acrochaetium corymbiferum (Thuret) Batters, 1902 accepted as Colaconema corymbiferum (Thuret) Alongi, Cormaci & G.Furnari, 2017
26. Species Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914
27. Species Acrochaetium gynandrum (Rosenvinge) Hamel, 1927 accepted as Colaconema gynandrum (Rosenvinge) R.Nielsen, 1994
28. Species Acrochaetium hallandicum (Kylin) Hamel, 1927 accepted as Colaconema hallandicum (Kylin) Afonso-Carillo, Sanson, Sangil & Diaz-Villa, 2007 (synonym)
29. Species Acrochaetium infestans M.Howe & Hoyt, 1916 accepted as Colaconema infestans (M.Howe & Hoyt) Woelkerling, 1973 (synonym)
30. Species Acrochaetium lanuginosum (Dillwyn) Nägeli, 1858 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985
31. Species Acrochaetium leptonema (Rosenvinge) Børgesen, 1915 accepted as Colaconema leptonema (Rosenvinge) Alongi, Cormaci & G.Furnari, 2017
32. Species Acrochaetium minimum Collins, 1908 accepted as Colaconema minimum (Collins) Woelkerling, 1973
33. Species Acrochaetium rosulatum (Rosenvinge) Papenfuss, 1945 accepted as Kylinia rosulata Rosenvinge, 1909
34. Species Acrochaetium savianum (Meneghini) Nägeli, 1862 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994
35. Species Acrochaetium subtilissimum (Kützing) Hamel, 1927 accepted as Colaconema subtilissimum (Kützing) Alongi, Cormaci & G.Furnari, 2017
36. Species Acrochaetium virgatulum (Harvey) Batters, 1902 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858
37. Species Acrochaetium maluinum Hamel, 1927 (uncertain)
38. Species Acrochaetium pulvereum Nägeli, 1862 (uncertain)

marine, fresh

Nägeli, C.; Cramer, C. (1858). Die Stärkekörner: Morphologische, physiologische, chemisch-physicalische und systematisch-botanische Monographie. <em>Pflanzenphysiologische.</em> pls XI-XXVI. (look up in IMIS) [details] 

Guiry, M.D. & Guiry, G.M. (2025). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Acrochaetium Nägeli, 1858. Accessed through: The UK Marine Environmental Data and Information Network (2025) Marine Species of the British Isles and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications at: https://www.marinespecies.org/msbias/aphia.php?p=taxdetails&id=143799 on 2025-05-11

The UK Marine Environmental Data and Information Network (2025). Marine Species of the British Isles and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications. Acrochaetium Nägeli, 1858. Accessed at: https://marinespecies.org/Msbias/aphia.php?p=taxdetails&id=143799 on 2025-05-11

[taxonomic tree]