Cyclopyxis arcelloides var. gibbosa Van Oye, 1949
Diagnosis: The dimensions and domed shape of the shell separate this species from all those with which it has certain common characteristics. It most closely resembles C. eurystoma Deflandre but differs in size. The ventral side of the test never carries larger stones, as is usually the case for C. eurystoma.
Dimensions: Diameter 32.5 µm; height 30 µm; pseudostome diameter 10 µm.
Ecology: Form with an aquatic tendency, Java, Indonesia.