Pyxidicula minutissuma Brodsky, 1929
Diagnosis: Test in the shape of a halved egg with a gracefully rounded tip and slightly trampled walls at the bottom, where there is a wide entrance opening. Dual-contour walls of the test are completely transparent and slightly grainy.
Dimensions: 15 µm x 15 µm.
Ecology: Freshwater, Found in small quantity in the well Mamed-Yar, Turkmenistan.