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

Centropyxis declivistoma

Centropyxis declivistoma, after Chardez, 1990 Centropyxis declivistoma Chardez, 1990 Diagnosis: Test ovoid, slightly compressed dorso-ventrally, especially in the anterior region, embedded with polymorph mineral platelets. Pseudostome

Read More »

Plagiopyxis bicamera

Plagiopyxis bicamera, after Coûteaux, 1978 Plagiopyxis bicamera Coûteaux, 1978 Diagnosis: Test elongated, in ventral view elliptical, dorso-ventrally compressed, colorless or yellowish, with a cryptostome with visor.

Read More »

Arcella jurassica

Arcella jurassica, after Olivier, 1944 Arcella jurassica Olivier, 1944 Diagnosis: Test pyramid-shaped but strongly truncated, in lateral view trapezium-shaped, with 5-8 planes; pseudostome surrounded by

Read More »

Assulina discoides

Assulina discoides , after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bobrov, Shimano and Mazei, 2012 Diagnosis: Shell large in size, disc shaped, colorless, transparent,

Read More »

Deharvengia

Deharvengia japonica, after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bonnet, 1979, emend. Bobrov, Shimano and Mazei, 2012 Diagnosis: Test transparent, oval or ovoid in

Read More »