world of amoeboid organisms

A. verbrugghei

Genus Apogromia De Saedeleer, 1934

Diagnosis: Test hyaline, small, flask-shaped, with single terminal aperture, with or without a distinct neck; outline circular, sometimes irregular or angular. No septum. Test composed of an organic material without any embedded xenosomes; color usually yellow-brown till dark-brown. Cytoplasm with symmetrical bundle of granulopodia (peduncle or “Pseudopodienstiel”), very thin, suppressed to the substrate and able to branch and anastomose, thus forming a network or reticulum. Nucleus relatively large, globular with a central nucleolus. One contractile vacuole.

Ecology: freshwater and marine; shallow, ironrich water, Spagnum.

Remarks: the main difference between Microgromia and Apogromia is the presence of a septum in the first one. De Saedeleer describes three species, but I’m unable to distinguish between A. flandriensis and A. lemercieri. The distinction is only based on the visibility of the pseudopodia, which in my opinion isn’t very useful as a diagnostic character.

Test spherical or ovoid, symmetrical, with distinct neckA. mucicola
Test asymmetrical, with broad neckA. flandriensis
Test pyriform or ovoid, with or without distinct neckA. verbrugghei
Test pyriform or ovoid, without distinct neckApogromia spec.
Test balloon-shaped, with tubular neck; neck not fastened to the substrateApogromia spec.
Test balloon-shaped or broad ovoid, without neckApogromia spec.
Test globular or broadly bell-shaped, with short tubular neckA. pagei
Test pear-shaped with a wide aperture, with typical Y-shaped pseudopodium stalkApogromia spec.
Test elongated ovoid, like a sausageApogromia spec.

Apogromia spec.
Apogromia verbrugghei
Apogromia spec.
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