Microcometes paludosa

 

 

Genus Microcometes Cienkowsky, 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.

Type species: Microcometes paludosa Cienkowski, 1876

 

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

 

Ecology: freshwater; bacterivorous.

 

Remarks: The two flagella are easily overlooked and even the filopodia are hard to detect. Because of these flagella, this genus has been moved to the heterotrophic flagellates.
De Saedeleer (1934) describes two species, Microcometes paludosa and M. aculeata, with short spines. The latter has originally been described by Lauterborn (1908) as M. paludosa var. aculeata.
Microcometes paludosa is not rare, but usually not easy to discover in fresh preparations. Best is to keep preparations in moist chambers and to scan them regularly. Specimens mostly attach to the cover glass and are easily visible because of the dark brown color.

Click here for the original description of Cienkowski.

 

Microcometes paludosa - Ferry Siemensma

Microcometes paludosa

Microcometes paludosa - Ferry Siemensma

Microcometes paludosa with three apertures

bar = 10 µm

Microcometes paludosa

Microcometes paludosa - Photomicrograph: Yana Egli