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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.

1Distinctive hyaline zone in locomotive formHartmannella
Copromyxa
Hyaline zone in locomotive form reduced or absent2
2Uroid, if present, reducedCashia
Uroid, often bulbous and villous3
3Cytoplasm often with prominent crystals or inclusionsSaccamoeba
Cytoplasm without crystalsGlaeseria
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