Family Hartmannellidae Volkonsky, 1931
Uninucleate amoebae, monopodial with a cylindrical pseudopodium when active. Most floating forms without radiating pseudopodia. Nucleus with a prominent central nucleolus.
|1||Distinctive hyaline zone in locomotive form||Hartmannella
|–||Hyaline zone in locomotive form reduced or absent||2|
|2||Uroid, if present, reduced||Cashia|
|–||Uroid, often bulbous and villous||3|
|3||Cytoplasm often with prominent crystals or inclusions||Saccamoeba|
|–||Cytoplasm without crystals||Glaeseria|