Genus Nadinella Penard, 1900
Diagnosis: shell ovoid or pyriformi, in cross section circular, narrowing towards the pseudostome into a distinct neck; aperture broad elliptical, surrounded by a thin hyaline outward bend collar; shell composed of an organic matyerial, embedded with mineral grains of different size, usually not covering the surface completely, with larger graines embedded in the fundus part en smaller graines towards the aperture; the collar is free of graines. Nucleus globular. Filopodia very long and thin, usually one to three. Plasma doesn't fill the shell completely. One known species.
Ecology: freshwater, clear stagnant and runn ing waters