Amoeba (genus)
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| Bory de Saint-Vincent , 1822 |
Amoeba is a genus of bare, amoeboid unicellular organisms from the Euamoebida group . They colonize fresh water.
The term is historically closely linked, but not identical to that of the amoeba .
features
The species of the genus usually reach a length between 220 and 760 micrometers. Only Amoeba diminutiva remains between 15 and 20 micrometers in size. The cells can actively move. Dormant or saturated cells are irregularly round; cells in flowing motion have long, radial pseudopodia. As a rule, they are polypodial (i.e. they form many cell processes [ pseudopodia ] for movement) with a cylindrical, clearly enlarged pseudopodium.
The species only have a disc or egg-shaped nucleus . The components of the nucleolus are mostly scattered. The grainy appearing cytoplasm often contains blunt bipyramidal crystals. The uroid , if present, is mulberry-shaped .
Systematics
The genus was first described in 1822 by Jean Baptiste Bory de Saint-Vincent , the type species is Amoeba proteus . The generic name comes from the Greek and refers to the shape-changing abilities of the cells. The sister taxon of the genus Amoeba is the genus Chaos .
The genus includes the following species:
proof
- ^ A b c Andrew Rogerson, David J. Patterson: The Naked Ramicristate Amoebae , In: John J. Lee, GF Leedale, P. Bradbury (Eds.): An Illustrated Guide to the Protozoa . tape 2 . Allen, Lawrence 2000, ISBN 1-891276-23-9 , pp. 1041 .
- ^ DR Khanna: Biology Of Protozoa , 2004, ISBN 8171419062 , p. 257.
- ↑ Ignacio Bolivar, José F. Fahrni, Alexei Smirnov, Jan Pawlowski: * SSU rRNA-based Phylogenetic Position of the Genera Amoeba and Chaos (Lobosea, Gymnamoebia): The Origin of Gymnamoebae Revisited In: Molecular Biology and Evolution, Volume 18, Issue 12, pp. 2306-2314, 2001.
