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

Observations on Centropyxis discoides

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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 Excentrostoma Lahr et al., 2019
●●●●●● Family Centropyxidae Deflandre, 1953
●●●●●●● Genus Centropyxis Stein, 1857

Centropyxis discoides (Penard, 1902) Deflandre, 1929

Most likely ID: n.a.

Basionym: Centropyxis aculeata var. discoides Penard, 1890

Add’l Synonyms: Centropyxis discoides var. grandistoma Chardez, 1966

Sampling date 06/2025. Scale bars indicate 100 µm.

Two images.

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

Stereo microscope Olympus SZX16, camera Olympus OM-D M5 MKII. DOF image.

Sampling date 06/2025. Scale bars indicate 50 µm (1), 100 µm (2, 3).

Three images, two of them in a slide changer.

First:	Test in ventral view.
Second:	Looking at the shell in lateral view, the aperture lies on the upper side.
Third:	Optical cross-section of image no. 2. The pillars inside the shell relevant for this type of determination and their attachment points on the outer wall are marked with arrowheads in the inset for clarity.

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

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

Sampling date 10/2011. Scale bar indicates 50 µm.

Test of Centropyxis discoides with embedded frustules of pennate diatoms.

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

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

Sampling date 10/2019. Scale bars indicate 50 µm.

Empty test. Two images with (a) focus on the test (shell) and (b) focus on the lumen containing eggs from tiny metazoa.

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 Waasenmoos, Pass Thurn near Mittersill (Tyrol, Austria)
Latitude: 47.30234117 Longitude: 12.41751194

Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. 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 Centropyxis discoides

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