Galeripora rota (Daday, 1905) González-Miguéns et al., 2021

Diagnosis: Shell in dorsal view circular with numerous, 38-40, small spines, giving the impression of a gear. Shell in side view flat, height about ¼ of the diameter. In lateral view, the test resembles a watch glass, is curved rather bluntly, its greatest height is no more than a quarter of its diameter. The edge of the shell is slightly curved at the top, but flat on the ventral side. The spines on the edge are slightly raised. They are either straight out or curved down, relatively short and no larger than a tenth of the shell diameter. The aperture forms a simple funnel, but it is conspicuously narrowed inwards and reaches hardly or not half the height of the shell cavity; the outer seam is about 180 µm, while the inner one is just 40-70 µm in diameter. The aperture is surrounded by pores.

Dimensions: The largest diameter of the shell, including the spines, is 240—270 µm; the greatest height 60 µm. Other measurements: diameter 162—219 µm; height 30 µm; aperture 60—81 µm (https://tecamebas.com.br/galeripora-rota/).

Habitat: Freshwater.

Geographical distribution: South-America (Paraguay and Brasil). Originally discovered in Paraguay, Asuncion, sandbanks covered with half-dry Camalote in the tributaries of the Paraguay River; Cerro Leon, Banado; between Lugua and Aregua, puddle by the railway; Tebicuay, puddle; Villa Rica, wet, springy meadow.