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world of amoeboid organisms

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Microgromiidae
genera of Microgromiidae

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
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Centropyxis tropica

C. tropica, after Deflandre, 1929 Centropyxis tropica  Deflandre, 1929 Basionym: Centropyxis aculeata var. tropica Deflandre, 1929 Diagnosis: As for C. aculeata, but with much longer

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Centropyxis nauwercki

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Centropyxis pontifera

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Centropyxis pyriformis

Centropyxis pyriformis, after Van Oye, 1958 Centropyxis pyriformis  Van Oye, 1958 Diagnosis: This species is distinguished from C. aculeata by its narrowed shape towards the

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Centropyxis dentistoma

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Centropyxis compressa

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Centropyxis lata

Centropyxis lata, after Jung, 1942 Centropyxis lata  Jung, 1942 Diagnosis: Shell coarse-scaled, covered with a mix of diatoms and detritus; pseudostome large, ventral side mostly

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Centropyxis aurita

Centropyxis aurita, after Laminger, 1973 Centropyxis aurita  Laminger, 1973 Diagnosis: In ventral view, the shell is more or less broadly ovoid in outline. Quite straight truncated

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Centropyxis grelli

Centropyxis grelli, after Laminger, 1973 Centropyxis grelli  Laminger, 1973 Diagnosis: Shell covered with relatively large mineral particles. The pseudostome outline is formed by two convex arches.

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Centropyxis adami

Centropyxis adami, after Laminger, 1971 Centropyxis adami  Laminger, 1971 Diagnosis: In ventral view, the outline of the shell is more or less elliptical, in side

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