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.
Raphidocystis arborescens (Jones 1974) Zlatogursky, 2018 Basionym: Cienkowskya arborescens Jones, 1974 Diagnosis: under construction Ecology:
after Zlatogursky et al., 2018 Raphidocystis glabra Dürrschmidt, 1985 Diagnosis: Periplast 40-50 μm in diameter; spine-scales 4.6–15 μm; plate-scales 6-7 × 3-3.5 μm; tiny teeth
Raphidocystidae Zlatogursky, 2018 Diagnosis: centrohelids with monolayered plate-scales covering cell surface. Plate-scales with a hollow inflected margin. Sometimes trumpet-shaped or tubular spine-scales present, forming an
P. liboica – from Bonnet, 1979 Planhoogenraadia liboica Bonnet, 1979 Diagnosis: . Test relatively flat, with a dorsal convexity. Shell widest in the center. Aperture deep
Deharvengia papuensis, after Bonnet, 1979 Deharvengia papuensis Bonnet, 1979 Diagnosis: Theca large, ovoid, very regular, colorless. Elliptical pseudostome bordered by a thick yellowish lip or