Genus Cyclopyxis (Deflandre, 1929)

Diagnosis: The shell is brown in color. In ventral view, it appears circular, while in lateral view, it is hemispherical. It is composed of agglutinated mineral particles. The aperture is central, invaginated, and circular, sometimes featuring an internal tube. A few species exhibit an irregular or lobed pseudostome, but the margin never has a thick organic lip; instead, it is often adorned with small mineral particles. The ventral surface is typically smooth, whereas the dorsal part is rough, characterized by larger sand grains.
This group comprises more than 30 species and over twice as many varieties.

Type species: Cyclopyxis arcelloides (Penard, 1902)

Ecology: Sphagnum mosses, soil.

Common species:
Cyclopyxis eurystoma
Cyclopyxis kahli
Cyclopyxis intermedia