In contrast, Lobosa are entirely amoeboid with broad pseudopodia. Conosa's flagella are artifacts of their ancestral conditions and are seen in trophic and swarm cell phases. Flagellate Conosa have a cone-shaped microtubular skeleton, and non-ciliate forms contain extensive microtubes in the cytoplasm, both of which are not seen in Lobosa.

While morphological characteristics like pseudopodia and body shape, flagella, and cytoplasm properties have not been regarded as convincing taxonomic suggestions,