Lieberkuehnia wageneri   Claparède and Lachmann, 1859

Diagnosis: Cell fragile, extremely variable in size, 50-(80-120)-200 µm long, with an organic-walled test with a single aperture. Shell in general sub-spherical to ovoid or pyriform, sometimes elongated pyriform. Shell hyaline, colorless or slightly yellowish, very supple and deformable, smooth and delicate. The anterior part of the cell tapers towards the eccentric, oblique and crescent shaped aperture.  Where the eccentric pseudopodial peduncle reaches the aperture, a vast network of branching pseudopodia radiates. Protoplasm clear, in continuous streaming,  with many small granules, bi-refringent granules and globules, vacuoles and nuclei. The amount of nuclei may strongly differ per cell, but is always considerable, seldom fewer than 30 and often more than 150. Nuclei spherical, commonly 6 µm in diameter and each nucleus with one hemispherical nucleolus, laying close to the nuclear membrane. In specimens with a low amount of nuclei the diameter of the nuclei is larger, up to 12  µm. Rarely there are two or three nucleoli present, and large nuclei can contain up to six biconvex shaped nucleoli, all close to the nuclear membrane.

Measurements. 50-(80-120)-200 µm

Habitat: Fresh water; on black plastic foil on the bottom of a fishpond in Germany (2017)

References: Siemensma, F., Holzmann, M., Apothéloz-Perret-Gentil, L., Clauss, S., Völcker, Bettighofer, W., E., Khanipour Roshan, S., Walden, S., Dumack, K., Pawlowski, J., 2020: Broad sampling of monothalamids (Rhizaria, Foraminifera) gives further insight into diversity of non-marine foraminifera. Europ. J. Protistol. https://doi.org/10.1016/j.ejop.2020.125744