Amoeba proteus
Amoeba proteus

 

 

Genus Amoeba Bory de St. Vincent, 1822

 

Diagnosis: locomotive cells commonly polypodial, with several tubular pseudopodia with hemispherical tips and usually hyaline caps; one pseudopodium dominant at one time, often with ectoplasmic ridges; monopodial in rapid locomotion; nucleus single, granular in most described species; resting cells irregularly rounded, floating form with long radiating pseudopodia; cytoplasm often with truncated bipyramidal crystals; posterior uroid morulate.

Ecology: Freshwater. In all kind of water types.

 

Key to the species:

1

Nucleus large, mean 40 µm, discoid, often biconcave

A. proteus

-

Nucleus smaller, spherical, ovoid or compressed

2

2

Nucleus compressed spherical, ovoid or lens-shaped, mean 29 µm; crystals mainly squared

A. borokensis

-

Nucleus spherical, often slightly compressed; numerous bipyramidal crystals

A. leningradensis

 

Amoeba proteus
Amoeba proteus: A-B-C polypodial forms; D monopodium; C specimen with numerous crystals; E dividing stage (fission sphere); F bipiramidal crystal; G tile-shaped crystal; H four crystals in a row.