Microworld

world of amoeboid organisms

Menu
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.
Recent posts

Netzelia levanderi

Difflugia levanderi , after Playfair, 1918 Difflugia levanderi  Playfair, 1918 Diagnosis: Test lance-oblong or mitriform (shaped like a bishop’s miter), short and broad, fundus shaped

Read More »

Netzelia angelica

D. angelica after Gauthier-Lièvre et Thomas, 1960 Difflugia angelica Gauthier-Lièvre et Thomas, 1960 Diagnosis: Test spherical, slightly mammillated. Pseudostome regularly lobed like a star with

Read More »

Test

fgdfgdfgfgfgfg fgdfgfd fg dfgfd gfdg fdg C. lunaristoma – from Coûteaux et Chardez, 1981 fdgdfgdfgfdgfgdfgfgf fgdgfdgfd gfdg dfgdf C. lunaristoma – from Coûteaux et Chardez,

Read More »

Frenopyxis bipilata

F. bipilata, Croatia, Tamnica Frenopyxis bipilata  (Baković, Siemensma, Baković and Rubinić, 2019) comb. n. Diagnosis: In dorsal view, the test is rounded and usually slightly wider

Read More »

Darbyshirella terrestris

D. terrestris, after Berney et al., 2015 Darbyshirella terrestris  Berney, Bass & Geisen, 2015 Diagnosis: Non-marine, with morphological characteristics of the genus. Usually above 600 um

Read More »

Acanthocystis elenazhivotovae

A. elenazhivotovae – from Leonov, 2010 Acanthocystis elenazhivotovae  Leonov, 2010 Diagnosis: Cell diameter 22-25 µm. Periplast with tangential plate-scales and radial spine-scales. Spine-scales 3.2-6.0 µm,

Read More »