Finally, a testate amoeba that I can put a name to. This amoeba has a test around 20 micrometers diameter and long pseudopodia in the form of filopodia, up to 90 - 100 micrometers. While stationary, the filopodia extend out in all directions. They are in a state of constant change, extending and retracting. They also are anastomosing, meaning they branch out from a single filose projection and sometimes fuse together. This fusion is well demonstrated in the last image. The third image down is a demonstration of how it can totally retract all of its filopodia. In this state you would never know what it was.
This a fast mover. When it wants to move, the filopodia mostly extend outward in the direction it will travel. This again well demonstrated in the last image. Just a note, this is a different subject than that of the first 3 images. I should also point out that a naked amoeba is on the move in the upper right-hand corner. This a fresh water specimen from local pond water.
Walter
DIAVERT microscope with 40x NPL achromat and Zernike phase contrast.
Nikon D800 with a Diagnostic Instruments 1X projection lens.
Modified Vivitar 283 flash.
Amoeba - Volume 5 – Gromia fluvialis.
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Amoeba - Volume 5 – Gromia fluvialis.
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