Family Vannellidae Bovee, 1970
Diagnosis: Amoebae have locomotive forms markedly flattened, fan-shaped, or linguiform with a prominant anterior hyaline zone without subpseudopodia. No posterior uroid. Floating form of most with radiating pseudopodia, either blunt or tapered. Nucleus of most with prominant central nucleolus, rarely with parietal lobes. Cytoplasmic crystals rare.
Glycocalyx of the only two genera studied by TEM differentiated into either pentagonal glycostyles (Vannella) or hexagonal arrangements (Platyamoeba).
Remarks: Family diagnosis emended by Page (1987) on the basis of this ultrastructural information. The present grouping of genera is based on morphological similarities at the LM level since ultrastructural details are unavailable for most.
Hyaloplasm with surface features
Hyaloplasm extends posteriorly as border
Hyaloplasm predominantly anterior
Surface features faint
Surface features obvious
Usually with faint longitudinal edge ridges
Usually with faint lateral folds
Hyaloplasm with series of superimposed waves
Hyaloplasm with conoidal bosses