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

Observations on Difflugia rubescens

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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 Longithecina Lahr et al., 2019
●●●●●● Family Difflugiidae Wallich, 1864
●●●●●●● Genus Difflugia Leclerc, 1815

Difflugia rubescens Penard, 1891

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: n.a.

Remark:
The shell structure and feeding behavior are very similar to Pseudonebela africana. Since the feeding behavior, in particular, does not fit the genus Difflugia at all, it is very likely that it is a member of the genus Pseudonebela. For details, see https://arcella.nl/pseudonebela-rubescens/.
Molecular biological studies in this regard would be desirable!

Sampling date 06/2007. Scale bars indicate 25 µm.

Three images.

First:	Optical cross-section showing cytoplasma.
Second and third:	Synoptic representation of the test (shell).

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

Microscope Zeiss Universal, camera Olympus C7070WZ. The synoptic representation of the tests are DOF images.

Sampling date 06/2024.

Difflugia rubescens has a very special way of feeding:
These amoebae are capable of piercing the cellulose walls of desmids and ingesting their cell contents. Their aperture is serrated; for details, see https://arcella.nl/pseudonebela-rubescens/.
The side-view images of the test above provide a glimpse of these teeth (arrows in the inset in the upper left corner).

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

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 Difflugia rubescens

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