1. Subfamily Austrolithoideae A.S. Harvey & W.J. Woelkerling, 1995
   1. Genus Boreolithon A.S.Harvey & Woelkerling, 1995
2. Genus Boreolithothamnion P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
3. Subfamily Choreonematoideae W.J. Woelkerling, 1987
   1. Tribe Choreonemateae
      1. Genus Choreonema F.Schmitz, 1889
4. Genus Lithothamnion Heydrich, 1897
5. Subfamily Melobesioideae Bizzozero, 1885
   1. Genus Exilicrusta Y.M.Chamberlain, 1992
   2. Genus Melobesia J.V.Lamouroux, 1812
6. Genus Phymatolithon Foslie, 1898

marine

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). Hapalidiaceae J.E.Gray, 1864. 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=368755 on 2025-05-24

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. Hapalidiaceae J.E.Gray, 1864. Accessed at: https://www.marinespecies.org/Msbias/aphia.php?p=taxdetails&id=368755 on 2025-05-24

[taxonomic tree]  [list species]