Cyclopyxis eurystoma Deflandre, 1929
Diagnosis: Shell yellow or brown, circular, and hemispherical in lateral view; shell surface rough except for the apertural collar; aperture circular, central and bordered by a smooth band of organic cement; shell yellowish - brownish, hemispherical with a circular, slightly invaginated aperture (distinction between C. eurystoma and Phryganella acropodia!). As a rule, aperture in relation to the diameter of the shell greater than in P. acropodia.
Dimensions: Deflandre (1929): diameter 60-66 µm; depth of shell 49-52 µm; diameter of aperture 32-34 µm. Other workers: diameter of shell 69-80 µm; depth of shell 46-55 µm; diameter of aperture 34-46 µm.
Ecology: mosses, Sphagnum
Cyclopyxis eurystoma var. stenostoma Decloitre, 1949
Dimensions: Shell diameter 64-70 µm; shell depth 50 µm; pseudostome diameter 10-12 µm; pseudostome invagination 16-20 µm.