Comprehensive Description

Description of Amoeba proteus

Length of this species in locomotion about 220-760 microns (mean 425 microns). Nucleus discoid, often concave, 22-62 microns (mean 40 microns), nucleus with thickened wall. The majority of the cells are usually polypodial under favourable conditions, with lobose pseudopodia, with a small minority of cells being monopodial. With posterior rumpled uroid. Has world-wide distribution.
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Amoeba proteus

Amoeba proteus, previously Chaos diffluens, is an amoeba closely related to the giant amoebae. A species commonly bought at science supply stores.

This small protozoan uses tentacular protuberances called pseudopodia to move and phagocytose smaller unicellular organisms, which are enveloped inside the cell's cytoplasm in a food vacuole,[1] where they are slowly broken down by enzymes. Amoeba proteus is very well known for its extending pseudopodia. It occupies freshwater environments and feeds on other protozoans, algae, rotifers, and even other smaller amoebae. Due to phytochromes, A. proteus may appear in a variety of colors (often yellow, green and purple) under a microscope.

A. proteus possesses a nucleus containing granular chromatin, and is therefore a eukaryote. Its membrane is mostly gram negative.

Video gallery[edit]

Amoeba proteus in motion
Amoeba engulfing a diatom

See also[edit]


  1. ^ Nishihara E, Shimmen T, Sonobe S (December 2004). "Functional characterization of contractile vacuole isolated from Amoeba proteus". Cell Struct. Funct. 29 (4): 85–90. doi:10.1247/csf.29.85. PMID 15665503. [dead link]

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