Cyclopyxis thomasi Stepanek, 1963

Diagnosis: The shell is similar to the shell of Cyclopyxis kahli, but it is slightly lower. The aperture with the smooth edge is invaginated quite deeply. The dorsal side has a massive hollow horn, similar to specimens of the genus Difflugia. When viewed from the side, it is triangular with a broad base. The test is grey-brown, covered with mineral fragments.

Dimensions. According to Stepanek (1963): Shell diameter 80 µm; height 52 μm; diameter at the aperture 56 μm; aperture 22 μm; length of the horn 14 μm.

Ecology: Freshwater.

Remarks: Lake Vranov, Czech Republic.