Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         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]
                   [Genus Cryptaulax Skuja (1948)] see Genus Rhynchobodo J.B. Lackey, 1940
                     [Cryptaulax akopos (H.L. Skuja, 1939) H.L. Skuja, 1948] see Rhynchobodo akopos (H.L. Skuja, 1939) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax conoidea H.L. Skuja, 1956] see Rhynchobodo conoidea (H.L. Skuja, 1956) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax elegans J. Larsen & D.J. Patterson, 1990] see Rhynchobodo elegans (J. Larsen & D.J. Patterson, 1990) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax formica H.L. Skuja, 1948] see Rhynchobodo formica (H.L. Skuja, 1948) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax longiciliatus H.L. Skuja, 1948] see Rhynchobodo longiciliatus (H.L. Skuja, 1948) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax marina Throndsen, 1969] see Hemistasia phaeocysticola (A. Scherffel, 1900) M. Elbrächter & E. Schnepf, in M. Elbrächter et al., 1996
                     [Cryptaulax thiophila H.L. Skuja, 1956] see Rhynchobodo thiophila (H.L. Skuja, 1956) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000
                     [Cryptaulax vulgaris H.L. Skuja, 1948] see Rhynchobodo vulgaris (H.L. Skuja, 1948) C. Bernard, A.G.B. Simpson & D.J. Patterson, 2000