Diagnosis: shell ovoid, without a constriction between body and neck; neck, if distinct, short and composed of much smaller particles than the rest of the shell; neck sometimes with concave sides, like a vase. Aperture circular. Sometimes with zoochlorellae.
Dimensions: my measurements 189-202 µm.
Ecology: fresh water; peat bogs. I found this species in Tirol, Austria.
Remarks: a distinct species.