Aperture usually surrounded by pores. Aperture diameter 0.45 of shell diameter. Shell diameter 180 µm.
Aperture surrounded by pores. Aperture diameter ≥ 0.4 of shell diameter. Shell very flat; diameter 180 µm.
Shell elliptical, quadrate or circular. Shell often with distinct dorsal folds or ribs. Aperture small and with pores.
Shell with six or more ribs; dorsal surface with ribs and depressions; aperture smooth, without crenulations.
Shell in side view trapezoid, with six or more ribs; aperture smooth without crenulations.
Shell in lateral view trapezoid, with 5-7 ribs. Aperture with pores.
Shell with basal border. Dorsal surface with depressions. Diameter c. 80-110 µm.
Shell with basal border. Dorsal surface with depressions. Diameter c. 80 µm.
Shell in lateral view hemispherical, with acute or somewhat rounded corners, sometimes with a basal border. Diameter c. 35-55 µm.
Shell hemispherical, with smooth and broad rounded corners in lateral view.
Shell with distinct basal border. Ratio diameter aperture/shell 0.2.
Shell dome shaped; aperture with irregular crenulated border.
Shell formed like a saddle. Aperture elliptical.
Test broader than high; heigth c. 80-90 µm.
Shell with undulations, more or less spherical.
Shell shaped like an old hat.
Shell resembling a pie; prominent folds or ribs often with darker color.
Shell with striated border
Shell with a number of projections.
Shell border with numerous small spines.
Shell flattened, with crenulated aperture.
Shell crowned with some spines.
Shell with high dome and distinct neck.
Shell like Gandalf’s hat.
Shell sub-hemispherical, round smooth aperture, thickened edges
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