Testate Amoebae –
Amoebozoa (Part), Stramenopiles (Part), Rhizaria (Part)

Observations on Arcella hemisphaerica

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Taxonomic tree according to Lahr et al., 2019 (https://doi.org/10.1016/j.cub.2019.01.078)
and González-Miguéns et al., 2022 (https://doi.org/10.1016/j.ympev.2022.107557)

Amorphea Adl et al., 2012
Amoebozoa Lühe, 1913, renewed definition Cavalier-Smith, 1998
● Tubulinea Smirnov et al., 2005
●● Elardia, Kang et al., 2017
●●● Order Arcellinida Kent, 1880
●●●● Suborder Glutinoconcha Lahr et al., 2019
●●●●● Infraorder Sphaerothecina Kosakyan, Lara and Lahr, 2016
●●●●●● Family Arcellidae Ehrenberg, 1843
●●●●●●● Genus Arcella Ehrenberg, 1832

Arcella hemisphaerica Perty, 1852

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: Arcella hemisphaerica f. undulata Deflandre, 1928
                       Arcella hemisphaerica var. depressa Playfair, 1918
                       Arcella hemisphaerica var. tuberculata Stepanek, 1963
                       Arcella rotundata Playfair, 1918
                       Arcella rotundata var. alta Playfair, 1918
                         Arcella rotundata var. aplanata Deflandre, 1928
                     Arcella rotundata var. stenostoma Deflandre, 1928
                     Arcella rotundata var. stenostoma f. undulata Deflandre, 1928
                       Arcella rotundata var. alta f. undulata Stepanek,1963

Sampling date 09/2011. Scale bars indicate 25 µm (1,2), 50 µm (3).

Members of the genus Arcella construct a proteinaceous test (shell) with numerous tiny alveoli reinforcing the test.

Three images.

First and second:	Lateral view, focus on cytoplasma.
Third:	Top view, synoptic representations of the test.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Bog Hegne Moor near Lake Constance (Germany)
Latitude: 47.718106 Longitude: 9.093974

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

Scale bar indicates 50 µm.

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

Microscope Zeiss Universal, camera Olympus C7070WZ.

Sampling date 04/2007. Scale bar indicates 25 µm.

The image shows a test from dorsal and ventral. On the ventral side, the aperture, two contractile vacuoles and two vesicular nuclei with centric nucleolus each are visible.

Place name: Pond Demühlen, rain storage reservoir in Kiel-Russee (Schleswig-Holstein, Germany)
Latitude: 54.304095 Longitude: 10.086073

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

© 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 Arcella hemisphaerica

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