Microgromiidae
genera of Microgromiidae

 

 

Family Microgromiidae De Saedeleer, 1934

 

Diagnosis: Small testate granofilose amoebae with a membranous shell which is usually attached to the substrate. Granulopodia branching and in some species anastomosing, usually appressed to the substrate; bidirectional streaming of extrusomes. One to several apertures, sometimes with an internal septum. Feeding on bacteria.

 

This is a poorly studied taxon. Often descriptions are insufficient and hard to compare with each other. Below is an attempt to distinguish known genera.

 

1

Shell free, not attached to any substrate

Paralieberkuehnia

-

Shell attached to substrate

2

2

Shell with one aperture

4

-

Shell with more apertures 3

3

Shell with two apertures

Ditrema

-

Shell with three or more apertures

Microcometes

4

Shell without any septum

Apogromia

-

Shell with septum

5

5

Septum symmetrically, shell with two apartments

Belaria

-

Septum asymmetrically, shell one apartment

Microgromia

 

 

Ditrema spec.
Microgromia minor
Microgromia minor, each shell c. 16 µm; the left hand cell is dividing; Vancouver, dried pond - Photomicrograph: Yana Eglit
Microgromia spec. - SEM by Eckhard Voelcker, 2015