Rhizaspis granulata Skuja 1948
Diagnosis: test a flexible, colorless, hyaline membrane, ovoid, strongly compressed; test in cross-section flattened; aperture slit-like, between folds and flexible; plasma fills the test completely; nucleus large, with single nucleolus; filopodia long and branched. Longitudinal division.
Dimensions: Length 43-67 µm, width 27-52 µm
Ecology: Freshwater, sediment. Marshes, Letland.