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Trigonopyxis arcula
Trigonopyxis arcula
Trigonopyxis arcula

Trigonopyxis arcula Penard, 1912

Diagnosis: Shell brownish, hemispherical; pseudostome central, invaginated, frequently triangular but more often irregular, surrounded by a distinct ring of organic cement; nucleus ovular.

Dimensions: Diameter of shell, my measurements: 87-173 µm. Within a population the size of the shells can vary considerably.

Ecology: Feeding on bacteria and fungi. Common in acid forest soil, litter, mosses (e.g. Sphagnum).

Trigonopyxis arcula
Trigonopyxis arcula
Trigonopyxis arcula
Trigonopyxis arcula
The shells above are all from the same sample from Ecuador (108-173 µm)
Trigonopyxis arcula
Trigonopyxis arcula
Ecuador
Trigonopyxis arcula
Trigonopyxis arcula
T. arcula,  87 µm – Sphagnum, The Netherlands
Trigonopyxis arcula
Trigonopyxis arcula
T. arcula, 87 and 148 µm
Trigonopyxis arcula
T. arcula, c. 110 µm
Trigonopyxis arcula
Austria
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