Microworld

world of amoeboid organisms

Menu

Family Amoebidae Ehrenberg, 1838

Diagnosis: Locomotive amoebae usually greater than 80 µm in length, with cylindrical pseudopodia with hyaline caps. Some species monopodial but most polypodial. Many have cytoplasmic crystals. Nucleus often with nuclear material in small fragments.

Key to the genera of family Amoebidae

1Amoeba multinucleate

2

Amoeba usually with one nucleus

3

2Amoeba usually polypodial, with longitudinal ridges

Chaos

Amoeba usually monopodial, without longitudinal ridges

Parachaos

3Amoeba monopodial, only branched when changing direction

4

Amoeba usually polypodial

5

4Amoeba free-living

Trichamoeba

Amoeba parasitic on freshwater coelenterates (hydra)

Hydramoeba

5One dominant leading pseudopodium with smaller lateral pseudopodia

6

Pseudopodia more or less equal-sized, radiating from a central mass like the fingers of a hand; villous bulb uroid

Polychaos

6Amoeba usually > 200 µm; nucleus granular

7

Amoeba usually < 200 µm; nucleus with few nucleolar pieces

Deuteramoeba

7With longitudinal ridges

Amoeba

Without longitudinal ridges

Metachaos

Recent posts

Penardochlamys arcelloides

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

Read More »

Reticulomyxa hannae

R. hannae, plasmodium – photomicrograph Steffen Clauss Reticulomyxa hannae Völcker and Clauß, 2020 Diagnosis: Trophozoites surrounded by a very thin mucous envelope, with slowly moving plasmodia, variable

Read More »

Velamentofex saxonensis

V. saxonensis, feeding (photomicrograph Steffen Clauss) Velamentofex saxonensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 30-95 μm, granuloreticulopodia up to 1000 μm long. with a hyaline, thin

Read More »

Velamentofex tyrolensis

V. tyrolensis (photomicrograph Steffen Clauss) Velamentofex tyrolensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 98-125 μm, with reticulopodia up to 300 μm long, with a hyaline,

Read More »

Velamentofex berolinensis

V. berolinensis Velamentofex berolinensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 50-300 µm, with a hyaline, extremely flexible, membranous test. Nuclei numerous, 11.6-16.2 µm in diameter,

Read More »

Lieberkuehniidae

 Lieberkuehniidae  Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test very flexible, elongated to broadly

Read More »