Amoeba
Amoeba proteus
Amoeba is a genus without switch, amoeboid protozoa from the group of Euamoebida. They colonize freshwater.
The term has historically been closely related, but not identical with that of the amoeba.
Features
The species of the genus reach a length from 220 to 760 microns typically. Only Amoeba diminutives remains large 15 to 20 microns. The cells can actively move. Dormant or saturated cells are irregularly rounded, cells in flowing motion have long ray-like pseudopodia on. They are usually polypodial (thus forming many cell processes [ pseudopodia ] to move off) with a cylindrical, much larger pseudopod.
Species have only one disk or oval nucleus. The components of the nucleolus are usually scattered. The granular appearing cytoplasm often contains a truncated bipyramidal crystals. The Uroid, if any, is mulberry- shaped.
System
The genus was first described in 1822 by Jean Baptiste Bory de Saint -Vincent, the type species is Amoeba proteus. The genus name comes from the Greek and refers to the gestaltwandlerischen capabilities of the cells. The sister taxon of the genus Amoeba is the genus chaos.
The genus includes the species:
- Amoeba proteus
- Amoeba Leningradensis
- Amoeba diminutives