life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukarya Chatton, 1925 see Domain Eukaryota Chatton, 1925
     Kingdom Protoctista Hogg, 1860
       Phylum Haptomonada
         Genus Calcidiscus Kamptner (1950)
         Genus Calciosolenia Gran, in J. Murray & Hjort (1912)
         Genus Calyptrosphaera Lohmann, 1902
         Genus Chrysochromulina J.B. Lackey (1939)
         Genus Coccolithus E.H.L. Schwarz (1894)
         Genus Discosphaera Haeckel (1894)
         Genus Emiliania W.W. Hay & H. Mohler (1967)
         Genus Gephyrocapsa Kamptner (1943)
         Genus Hymenomonas F. Stein (1878)
         Genus Phaeocystis G. Lagerheim (1893)
         Genus Pontosphaera Lohmann (1902)
         Genus Prymnesium J. Massart (1920)
         Genus Rhabdosphaera Haeckel (1894)
         Genus Syracosphaera Lohmann (1902)