| Aglaothamnion Feldm. -Maz., 1941 |
| Aglaothamnion boergesenii (Aponte & Ballantine) L'Hardy-Halos & Rueness, 1990 |
| Aglaothamnion brodiei (Harv.) Feldm. -Maz., 1941 |
| Aglaothamnion byssoides (Arnott ex Harv.) C.F. Boudouresque & M.M. Perret-Boudouresque, 1987 |
| Aglaothamnion cordatum (Børgesen) Feldm. -Maz., 1941 |
| Aglaothamnion endovagum (Setch. & N.L. Gardner) I.A. Abbott, 1972 |
| Aglaothamnion felipponei (M. Howe) Aponte, Ballantine, & J.N. Norris, 1994 |
| Aglaothamnion fragile (Suringar) Har., 1889 |
| Aglaothamnion halliae (Collins) Aponte, Ballantine & J.N. Norris, 1997 |
| Aglaothamnion herveyi (M. Howe) Aponte, Ballantine, & J.N. Norris, 1994 |
| Aglaothamnion hookeri (Dillwyn) Maggs & Hommers., 1993 |
| Aglaothamnion neglectum Feldm. -Maz., 1941 |
| Aglaothamnion pseudobyssoides (P. Crouan & H. Crouan) Halos, 1965 |
| Aglaothamnion tenuissimum (Bonnemaison) Feldm. -Maz., 1941 |
| Aglaothamnion uruguayense (W.R. Taylor) Aponte, Ballantine & J.N. Norris, 1994 |
| Callithamniaceae Kütz., 1843 |
| Callithamnion Lyngb., 1819 |
| Callithamnion acutum Kylin, 1925 |
| Callithamnion biseriatum Kylin, 1925 |
| Callithamnion bisporum N.L. Gardner, 1927 |