Frenzelina minima Hoogenraad, 1910
Diagnosis: test membranous, hemispherical or nearly spherical, with an more or less open ventral face; very small mineral grains attached to the membrane; test in dorsal view usually elliptical; plasmabody broad-elliptical or more or less kidney-shaped; fine filopodia; nucleus vesicular with central nucleolus.
Dimensions: test 17-26 µm; body 12-17 µm.
Ecology: between waterplants, in Sphagnum and on debris; the Netherlands.
Cyclopyxis arenata – after Boltovskoy and Lena, 1966 Cyclopyxis arenata (Cushman, 1930) Boltovskoy, 1956 Basionym: Pseudarcella arenata Cushman, 1930 Diagnosis: Hemispherical shell. Convex dorsal side,
C. impressa C. impressa C. stellata C. stellata C. crucistoma C. crucistoma C. crucigenia C. crucigenia C. grospietschi C. grospietschi C. triquestrus C. triquestrus C.
Cyclopyxis profundistoma – from Kufferath, 1932 Cyclopyxis profundistoma Kufferath, 1932 Diagnosis: The yellowish grey colored test is made of coarser mineral particles, which are connected
Cyclopyxis maynei – from Kufferath, 1932 Cyclopyxis maynei Kufferath, 1932 Diagnosis: Test cylindrical, characterized by the size of the aperture, which is 87-97 μm wide
C. kahli var. obliqua , after Decloitre, 1978 Cyclopyxis kahli var. obliqua Decloitre, 1978 Diagnosis: Test with all the characteristics of the type species
C. arcelloides var. ghesquierei , after Kufferath, 1932 Cyclopyxis arcelloides var. ghesquierei Kufferath, 1932 Diagnosis: This variety differs from the type species in its