Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Plantae Haeckel (1866) - plants
                           Clade Rhodaria Cavalier-Smith 2021
                             Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) [monotypic]
                               Phylum Rhodophyta Wettst. (1901) - red algae
                                 Subphylum Eurhodophytina G.W.Saunders & Hommers. (2004)
                                   Class Florideophyceae Cronquist (1960)
                                     Subclass Rhodymeniophycidae G.W.Saunders & Hommers. (2004)
                                       Order Gigartinales F.Schmitz
                                         Family Hypneaceae J.Agardh (1851)
                                           Genus Hypneaᵀ J.V.F. Lamouroux (1813)
                                             Hypnea cervicornis J.Agardh
                                             Hypnea musciformis (Wulfen) J.V.Lamour.
                                             Hypnea spinella (C.Agardh) Kützing, 1847:23
                                             Hypnea valentiae (Turner, 1809) Mont., in Barker-Webb & Berthelot, 1841:161