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 Cryptomonada see Order Cryptomonadida Senn, 1900
         Genus Cyathomonas Fromentel (1874)
           Cyathomonas truncata (Fresenius, 1858) C. Fisch (1885) see Goniomonas truncata (G. Fresenius, 1858) F.R. von Stein (1878)