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Apogromia spec
Apogromia spec.

Apogromia spec.

Diagnosis: Shell is hyaline, smooth and colorless. The form of the test is pyriform with a broad aperture without any distinct neck. The test wall is very thin, in older specimens thicker. The protoplast is pear-shaped, with its elongated pole toward the aperture. From this pole a thick pseudopodium is extended, which branches in the aperture into two, sometimes three, pseudopodia, like an Y. These pseudopodia also bend and branch. The protoplast does not fill the test completely. It is connected to the fundus region of the test. Only rarely were epipodia observed. The vesicular nucleus, situated near the aboral end of the cell, ranges in diameter from 3.6-4.2 µm. The cytoplasm contains a fair number of coarse, clear granules and several food vacuoles with bacteria. The single contractile vacuole is located in the oral region of the protoplast. The pseudopodia are light microscopically in phase contrast easy to follow along the whole length. Each pseudopodium has a number of granules, probably extrusomes. Some pseudopodia run back over the test.

Dimensions: Size of the tests: diameter of test 19.4-21.5 µm (n=7), diameter of aperture about 7 µm.

Ecology: Shore of the river Weser, Germany.

Remarks: This beautiful Apogromia has the widest of all known Microgromia and Apogromia species. The test wall is so thin around the aperture, that this isn’t visible light microscopically, not even in phase contrast. This species came up in a wet mount, kept for some days in a moist chamber, three months after the material has been collected from the river Weser in Germany.

Apogromia spec
Apogromia spec., with typical Y-shaped “Pseudopodienstiel
Apogromia spec
Apogromia spec., older test with thicker wall.
Apogromia spec
Apogromia spec., note the pseudopodium which runs back over the test.
Apogromia spec
Apogromia spec.
Apogromia spec
Apogromia spec., with a captured bacterium (arrow).
Apogromia spec
Apogromia spec., with irregularly shaped shell.
Apogromia spec
Apogromia spec.
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