[ref. ID; 5731 (Hibberd, 1983)]

Phalansteriida ord. nov.
Diagnosis; One smooth flagellum, inserted apically with the proximal part closely surrounded by a protoplasmic collar. Cells typicall colonial, embedded in a common mucilaginous matrix in which are also embedded small endogenously rounded spherules composed of compounds of iron. Nucleus central, Golgi body parabasal. Mitochondria with tubular cristae. Microtubular flagellar roots originating at ring-shaped microtubular organizing structures concentric with the flagellar basal body. Cysts present, more or less equally bipartite. Free-living.
Type genus; Phalansterium Cienkowsky, 1870

Spongomonadida ord. nov.
Diagnosis; Two smooth flagella inserted apically. Anterior end of cells with a shallow asymmetrical flagellar pocket and an asymmetrical anterior prolongation. Cells typically colonial, the colony matrix consisting of small spheres composed of compounds of iron, and variable quantities of mucilage. Nucleus anterior, Golgi body parabasal. Mitochondria with tubular cristae. Microtubular flagellar roots originatin near the flagellar basal bodies in association with short cross-banded fibrillar structures. Free-living.
Type genus; Spongomonas Stein, 1878