Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           [†pseudofossils]
             [Genus †Primaevifilum Schopf (1983), incertae sedis] see Genus Primaevifilum Schopf 1983 nom. inval.
               1 †Primaevifilum septatumᵀ Schopf 1983
               2 †Primaevifilum delicatulum Schopf 1992
               3 †Primaevifilum amoenum Schopf 1992
               4 †Primaevifilum conicoterminatum Schopf 1992