Diaphoropodon mobile
Diaphoropodon mobile, shell 120 µm

 

 

Genus Diaphoropodon Archer, 1869

 

DiagnosisDiaphoropodon is a genus of testate amoebae with filopodia. The test is ovoid or pear-shaped, sometimes irregular, membranous, flexible and composed of organic material, covered with many small particles. The test can be thin or very thick, visible as a broad dark brown border. Color normally brown up to black. Aperture flexible, varying in shape, more or less circular, usually hard to detect. Endoplasm hard to observe because of the dark color and thick layer of the shell. Nucleus vesicular and ovoid, with granular nucleolus. Nucleus in the posterior end of the shell. When the amoeba is moving, a large number of filopodia extend in all directions, often branching and sometimes anastomosing, but they are usually quickly retracted when exposed to bright light. A key characteristic are the rod-shaped hyaline spines, 8-10 µm long, which adhere to the test. Its structure and origin is not known. The rods are not present in empty shells.

 

Two known species, D. mobile and D. pyriforme. The latter species was described by Playfair, who gives as key characteristic the pyriform shape of his organism, but I have seen al kind of shapes within several populations. I don't consider it as a separate species.

 

Diaphoropodon mobile
Pear-shaped shell with typical rods
Diaphoropodon mobile
Cell with filopodial network
Diaphoropodon mobile
Diaphoropodon mobile, 165 µm - Kootwijk
Diaphoropodon mobile