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

Observations on Arcella gibbosa

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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 gibbosa Penard, 1890

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: n.a.

Sampling date 10/2011. Scale bars indicate 25 µm (1, 2), 50 µm (4).

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

Four images.

First:	Synoptic representation of the test (shell). Oblique view, focus on shell surface.
Second:	Oblique view, focal plane amidst the cell body.
Third:	Petri dish overview using dissecting microscope.
Fourth:	Apertural view.

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: Pond Suploch, Hiddensee (Germany)
Latitude: 54.538638 Longitude: 13.097802

a) Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.
b) Microscope Olympus SZX16, camera Olympus OM-D M5 MKII. DOF image.

Sampling date 10/2008. Scale bar indicates 25 µm.

Place name: Pond Suploch, Hiddensee (Germany)
Latitude: 54.538638 Longitude: 13.097802

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

Sampling date 04/2021. Scale bars indicate 50 µm.

Two images.

First:	Synoptic representations of the test (shell), apertural view.
Second:	Optical cross-section showing two vesicular nuclei with a large central nucleolus each, two contractile vacuoles and some food vacuoles.

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: Pond near Großostheim (Germany)
Latitude: 49.88482168 Longitude: 9.09980822

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

Sampling date 06/2025. Scale bars indicate 20 µm (1), 2 µm (2, 3).

Three images. Pseudostome view and two zooms on the building units of the honeycomb shell structure. In the last picture we can also see scales of Centroplasthelida (genus Acanthocystis) that were deposited on the shell during preparation.

Place name: Moor called Schwemm near Walchsee (Tyrol, Austria)
Latitude: 47.657707 Longitude: 12.299540 Elevation: 669 m

Tescan Clara SEM, © Wolfgang Bettighofer/Jürgen Stampfl

© 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 gibbosa

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