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Actinosphaerium eichhornii

Actinosphaerium eichhornii  (Ehrenberg, 1840) Stein, 1857

Diagnosis: Body usually spherical, sometimes cylindrical or flattened; cytoplasm usually with a discrete peripheral layer of large vacuoles; ecto- and endoplasm are clearly separated; diameter of the endoplasm more than twice the thickness of the ectoplasm; numerous nuclei, 20-500, scattered in the periphery of endoplasm, with some large central pieces of nucleolar material; axopodia granulated, large and thick, usually shorter than the body diameter; axonemes terminate on the nuclei or an electron-dense material near the nuclei; zoochlorellae sometimes present. Cyst with a mucous layer.

Dimensions: my measurements 30-2600 µm.

Ecology: fresh water, different kind of water types. Not rare. Feeding on algae, protists and even water fleas.

Actinosphaerium eichhornii, with engulfed diatoms.
Actinosphaerium eichhornii
Actinosphaerium eichhornii
Actinosphaerium eichhornii, on sediments in a micro-aquarium
Actinosphaerium eichhornii
Actinosphaerium eichhornii, 130 µm
Actinosphaerium eichhornii, nuclei
Actinosphaerium eichhornii, nuclei with central nucleolus.
Specimen with two nuclei, one is visible (arrow); nucleus with some nucleoli in the central area – Dune lake along the Dutch coast.
Actinosphaerium eichhornii
Actinosphaerium eichhornii, 170 µm
Actinosphaerium eichhornii
Actinosphaerium eichhornii, detail of the vacuolated area
Actinosphaerium eichhornii
Actinosphaerium eichhornii, each cell 200 µm
Actinosphaerium eichhornii
Actinosphaerium eichhornii, 170 µm
Actinosphaerium eichhornii
Actinosphaerium eichhornii, 150 µm, capturing algae
Actinosphaerium eichhornii
Actinosphaerium eichhornii
Actinosphaerium eichhornii, large specimen with preyed water flea
Actinosphaerium eichhornii
Actinosphaerium eichhornii, with clear zoning – the Netherlands, 2019
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