Microcometes paludosa - Ferry Siemensma
Microcometes paludosa

 

 

Microcometes paludosa Cienkowski, 1876

 

Diagnosis: Shell hyaline, usually dark brown, small, with one side fastened to the substrate; outline polygonal, irregular; shell with three to five apertures, with or without short necks. Pseudopodia very thin, granular, branching. Usually with two short flagella. Nucleus globular with a central nucleolus. Three to six contractile vacuoles.

 

Dimensions: Cienkowski shell 22 µm; De Saedeleer (1934): shell 6.8-17 µm. My measurements: 9.0-11.2 µm.

 

Ecology: freshwater; bacterivorous. A very common species. I found it in nearly all samples. One has to keep wet-mounts in moist chambers to let specimens (swarmers) come out of the detritus and settle to the glass, because they are hard to spot in the detritus. I found this species in The Netherlands and samples from Germany (Weser) and Peru (Lake Cocococha).

 

Remarks: The original description of Cienkowski is here. Additional information about Australia is here. Lee et al (2005) notice 4-8 apertures for Australian specimens. I have never seen more than 5. I agree with Lee et al that this is a common species.

 

Microcometes paludosa - Ferry Siemensma
Microcometes paludosa
Microcometes paludosa
Microcometes paludosa with four apertures
Microcometes paludosa
Microcometes paludosa, 9 µm, with five apertures; with enhanced contrast.
Microcometes paludosa
Microcometes paludosa, 8.7 µm, young colorless shell.
Microcometes paludosa - Ferry Siemensma
Microcometes paludosa, with four apertures; granular filopodia - Weser, Germany
Microcometes paludosa - Ferry Siemensma
Microcometes paludosa - Ferry Siemensma
Microcometes paludosa, living specimen, with three apertures
Microcometes paludosa
Microcometes paludosa
Microcometes paludosa, living specimen with five apertures, Simamoor - Austria; Microcometes paludosa, living specimen, with five apertures, Crailoo - Netherlands