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
               ["Protista" Haeckel, 1866, incertae sedis] see Kingdom protists
                 [Grade "protozoa" Goldfuss, 1818 - protozoans]
                   [Phylum Sarcomastigophora Honigberg & Balamuth, 1963]
                     [Subphylum Mastigophora Diesing, 1866 - flagellates]
                       [Class Phytomastigophorea Calkins, 1909 - photosynthetic flagellates]
                         [Order Dinoflagellida - dinoflagellates] see Phylum Dinoflagellata Engl. (1903)
                           [Family Peridiniidae] see Family Peridiniaceae Ehrenb. (1831)
                             [Genus Heteraulacus Diesing, 1850] see Genus Heteraulacus Diesing (1850), nom. rej. prop.
                               [Heteraulacus polyedricus (Pouchet, 1883)] see Pyrrhotriadinium polyedricum (Pouchet, 1883)
                               [Heteraulacus sphaericum (Murray & Whitting, 1899)] see Pyrrhotriadinium sphaericum (Murray & Whitting, 1899)
                               1 ?[Heteraulacus monas (Ehrenberg, 1840)]
                               2 [Heteraulacus acuminatus (Ehrenberg, 1836)] see Scrippsiella acuminata (Ehrenb.) Kretschmann, Elbr., Zinssmeister, S. Soehner, Kirsch, Kusber & Gottschling (2015)
                               3 [Heteraulacus adriaticus (Schmarda)]
                               4 [Heteraulacus fuscus (Ehrenberg, 1834)]