Aglaothamnion hookeri (Dillwyn) Maggs & Hommersand, 1993 accepted as Gaillona hookeri (Dillwyn) Athanasiadis, 2016 (new combination reference)
Ceramium siliquosum (Kützing) Maggs & Hommersand, 1993 (new combination reference)

Black Sea for Antithamnion Nägeli, 1847 
Cosmopolitan (World Oceans) for Aglaothamnion Feldmann-Mazoyer, 1941 
Cosmopolitan (World Oceans) for Antithamnion Nägeli, 1847 
Cosmopolitan (World Oceans) for Antithamnionella Lyle, 1922 
Cosmopolitan (World Oceans) for Polysiphonia Greville, 1823 
Kattegat for Ceramium cimbricum H.E.Petersen, 1924 
Lusitanian for Aglaothamnion Feldmann-Mazoyer, 1941 
Lusitanian for Antithamnion Nägeli, 1847 
Lusitanian for Antithamnionella Lyle, 1922 
Lusitanian for Polysiphonia Greville, 1823 
Mediterranean Sea for Aglaothamnion Feldmann-Mazoyer, 1941 
Mediterranean Sea for Antithamnion Nägeli, 1847 
Mediterranean Sea for Antithamnionella Lyle, 1922 
Mediterranean Sea for Polysiphonia Greville, 1823 
Northern European Seas for Aglaothamnion Feldmann-Mazoyer, 1941 
Northern European Seas for Antithamnion Nägeli, 1847 
Northern European Seas for Antithamnionella Lyle, 1922 
Northern European Seas for Polysiphonia Greville, 1823 
United Kingdom for Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922  (origin: alien)
United Kingdom for Neosiphonia harveyi (Bailey) M.-S.Kim, H.-G.Choi, Guiry & G.W.Saunders, 2001  (origin: alien)

Neotype BM 1067621, geounit Durham Coast, identified as Polysiphonia nigra (Hudson) Batters, 1902
Holotype BMNH L 940.142.282, geounit Devon, identified as Hormoceras siliquosum Kützing, 1847