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 biconcaveA. proteus
Nucleus smaller, spherical, ovoid or compressed2
2Nucleus compressed spherical, ovoid or lens-shaped, mean 29 µm; crystals mainly squaredA. 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

Penardochlamys arcelloides

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Lachmannia spec.

“Lachmannia” spec., body length 127 µm “Lachmannia” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »

Diplophrys spec. 7

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »