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Schwabia stoutii
Schwabia stoutii, from Lueftenegger and Foissner, 1991

Schwabia stoutii (Ogden, 1983) comb. nov.

Diagnosis: Test ovoid or ovoid elongate, in cross-section round or slightly compressed, composed of mainly small, flattish particles of siliceous material, including quartz, diatom frustules and shell plates from smaller testate amoebae. It is extremely fragile. Organic cement is seen only as small threads due to the regular overlapping of the shell components. The aperture is roughly circular, sometimes oval, small and appears to be recessed, but this latter feature may be due to structural fragility. Test brownish.

Dimensions: Ogden: Length 47-59 µm, width 33-36 µm, diameter of aperture 9-12 µm (n=4). Lüftenegger and Foissner, 1991: Length 38-61 µm (n=27), width 22-40 µm, thickness 16-25 µm, diameter of aperture 6-10 µm (n=15).

Ecology: Sphagnum, North Wales (Ogden, 1983), soil, Austria (Lüftenegger and Foissner, 1991).

Remarks: S. stoutii was described by Ogden (1983) as a Difflugia species, but nor he nor Lueftenegger and Foissner (1991) have seen any living specimens. They describe a fragile, elongate ovoid shell covered with flattish particles and with a small aperture. This description closely resembles Schwabia species, which I’ve observed several times: elongate ovoid shells with a thin smooth wall, a small aperture and filose pseudopodia. Therefore I’m pretty convinced that Difflugia stoutii represents a Schwabia species and therefore I transfer Difflugia stoutii to genus Schwabia.

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