Observations on Actinosphaerium eichhornii

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Actinosphaerium eichhornii (Ehrenberg, 1840) Stein, 1857

Most likely ID: n.a.

Basionym: Actinophrys eichhornii Ehrenberg, 1840

Add’l Synonyms: n.a.

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Sampling date 10/2016. Scale bars indicate 100 µm (1, 2), 50 µm (3).

Three frames. Cell tries to feed on a pennate diatom, but fails.

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Place name: Pond near the Bodden Bay Schwarzer Peter, Hiddensee (German Baltic Sea)
Latitude: 54.514946 Longitude: 13.082471

Microscope Zeiss Universal, camera Olympus OM-D M5 MKII. DOF images.

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Scale bars indicate 50 µm (1), 100 µm (2).

The green type of A. eichhornii with symbiontic green algae was described by Ehrenberg as Actinophrys viridis and later on (1904) transfered to genus Actinosphaerium by Penard as A. eichhornii var. viride.

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First image:
Sampling date 11/2007.
Place name: Bog Dosenmoor near Neumuenster (Schleswig-Holstein, Germany)
Latitude: 54.136219 Longitude: 54.136219

Microscope Zeiss Universal, camera Olympus C7070WZ.

Second image:
Sampling date 07/2011.
Place name: Wetland at the Pillersee (Tyrol, Austria)
Latitude: 47.531785 Longitude: 12.573095

Microscope Zeiss Universal, camera Olympus C7070WZ.

A very small specimen is shown (appr. 100 µm in diameter) with very delicate axopodia and numerous clearly visible nuclei (see also inset in the upper right corner)

Place name: Bog Dosenmoor near Neumuenster (Schleswig-Holstein, Germany)
Latitude: 54.136219 Longitude: 10.026433

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

Place name: Pond situated in the vicinity of Lake Constance (Germany)
Latitude: 47.734945 Longitude: 9.091097

Microscope Zeiss Universal, camera Olympus OM-D M5 MKII. DOF image.

Please note the curves spin near position 7 o’clock.

Sampling date 5/2019.

Place name: Creek in Oder valley 100 km north east of Berlin (Germany)
Latitude: 53.135032 Longitude: 14.348738

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.

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Observations on Actinosphaerium eichhornii

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