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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.

1 Distinctive hyaline zone in locomotive form Hartmannella
Copromyxa
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
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