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Astramoeba

Page updated 11/8/02

A very old genus, raised by Vejdovsky in 1881 (Schaeffer, 1926), the type species is A. radiosa but since has been reclassified on numerous occasions (see for Schaeffer, 1926 for a discussion of the more ancient literature).  Page discussed A. torrei in the context of Mayorella, yet unlike any other Mayorella, A. torrei produces cysts.  There does not seem to be a uniting feature of the amoebae described in the genus Astramoeba, save perhaps that they produce long pointed pseupods but then so do many others. 

Described species:-

A. flagellipodia (Schaeffer, 1926). Freshwater. c50mm in length while in locomotion. Has fewer than 10 pseudopods some of which are described as having characteristics between a flagella and a normal pseudopod.  No E.M. study has been carried out and as far as I know, no cultures of this amoeba presently exit, so the cytoskeletal components of these structures are unknown.  The description given by Scheaffer seems superficially to resemble the genus Flagellipodium.
A. radiosa  Described by several workers but its not certain if they were looking at the same amoeba.
A. stella (Schaeffer, 1926). Freshwater. 25-50mm in diameter with many blunt cylindrical pseudopods projecting at all directions. Locomotion uncertain and slow.

 

References:-

Jahn, T.L. & Jahn, F.L. (1949). "How to know the Protozoa". Iowa, Wm.C.Brown Publ.

 Schaeffer, A. (1926) "Taxonomy of the amebas." Pap.Dept.Mar.Biol.Carnegie Institut. Wash. Vol XXIV, 1-116.

 
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