Pseudothecamoeba proteoides  (Page, 1976) Page, 1988

Diagnosis: Monopodial forms more common but polypodial forms frequent; nucleus somewhat elongate, with numerous nucleolar fragments distributed throughout nucleus.
Ultrastructure: Surface filaments mostly to 80 nm above plasma membrane, some longer; inner nuclear lamina with possible loose honeycomb structure; no cyst known.
  
Dimensions: L 60-280 µm, mean 170 µm; L/B of monopodial forms 1.4-10.5, mean 4.0; nucleus 12-24 µm.

Ecology: Freshwater.