Amoeba proteus (Pallas, 1766) Leidy, 1878

Amoeba proteus 1-4: locomotive; 5 - monotactic form; 6-7: nucleus. Scale bar 20 mkm

Amoeba proteus 1: nuclear lamina; 2: mitochondria; 3: cell coat; 4: dictyosomes; 5: contractile vacuole. Scale bar 250 nm

  • Locomotive form usualy polytactic, with 3-4 large, well pronounced pseudopodia. Rapidly moving amoeba may adopt orthotactic form. Morulate uroid usual. Length in locomotion 457-860 mkm, breadth 57-140 mkm. Floating form radial, with several thick pseudopodia, containing both the granuloplasm and the hyaloplasm.
  • One granular nucleus, discoid, sometimes biconvex, about 40 mkm in diameter and 15 mkm in thickness. One contractile vacuole. Numerous bipiramidal cristals and rounded refractile inclusions in the cytoplasm. No cysts found.
  • Hexagonal nuclear lamina. Cell coat filamentous, filaments are about 230 nm in lenght. Mitochondrial heteromorhism is known, however it is not pronounced in the area, adjacent to the contractile vacuole. Dictyosomes are numerous, each consist of 5-10 cisternae.

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