Tiny Organisms in Aquatic Habitats

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

Observations on Arcella gibbosa

Arcella gibbosa

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 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.

Arcella gibbosa

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.

© 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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