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

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

Read More »

Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

Read More »

Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

Read More »

Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

Read More »

Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

Read More »

Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

Read More »