Apogromia pagei
Apogromia pagei
from Ertl, 1984

Apogromia pagei Ertl, 1984 > Paralieberkuehnia pagei (Ertl, 1984)

Diagnosis: Shell is hyaline or finely granular, transparent, yellow or sometimes pale-brownish, rarely dark brown. Shell usually globular or broadly bell shaped, apertural region flattened or moderately concave. Aperture prolonged as a short tube. In optical section the shell wall has a more or less wavy contour. A small part of population was represented by specimens with deformed tests. Protoplast pear-shaped, with its elongated pole toward the aperture. From this pole fine pseudopodia are extended.. The protoplast does not fill the test completely. It is connected to the test in or near the oral tube. Only rarely were epipodia observed. The large vesicular nucleus, situated near the aboral end of the cell, ranged in diameter from 6-7 um. The cytoplasm contains a fair number of coarse, clear granules, but specimens without such granules were also observed. The single contractile vacuole is located in the oral region of the protoplast. Division takes place within the test. Two daughter cells were sometimes observed in a test. Details of division are not yet known. The pseudopodia are extremely thin, so that it is difficult to follow them along the whole length. They are extended in the form of a broad cone. Each pseudopodium has two or three small granules. The number of pseudopodia varies from 10-20 or more, and their length reaches 40-50 um. Only exceptionally do pseudopodia anastomose.

Dimensions: Size of the tests: diameter of test 28-30 µm, diameter of apertures 5.5-7.5 µm, length of oral collarette 4-5.5 µm

Ecology: Backwater of the River Danube.

Remarks: In my opinion this is a Paralieberkuehnia species. The shell isn’t attached to the substrate and the granulopodia are straight, free and not appressed to the substrate.

Apogromia pagei
From Ertl, 1984
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