Kosakyan 2016
Test rigid or more or less flexible, either completely chitinoid or comprising recycled organic or mineral particles held together by an organic cement, or composed of self-secreted chitinoid or siliceous elements; always rounded in radial symmetry but varying in height from flattened saucer-shaped, hemispheric or more elongated to egg-shaped; pseudostome circular or lobed, surrounded by a collar; produces thick, digitate pseudopodia (lobopodia).
Ehrenberg 1832
Test more or less circular, aperture central, invaginated, in many species surrounded by a tube or a circle of pores.
Arcella gibossa top view
Arcella gibossa test details
Arcella gibossa top view
Arcella gibossa side view
Arcella gibossa
Ogden 1979
Test is rounded, with radial symmetry aperture is rounded and lobed.
Netzelia oviformis
Netzelia oviformis
Netzelia tuberculata
Netzelia tuberculata
Netzelia tuberculata
Ehrenberg 1838
Shell bowl-shaped, rigid, areolate, organic. Aperture almost as wide as the cell.
Pyxidicula patens
Pyxidicula patens
Penard 1912
Aperture centric, irregular, frequently triangular, always surrounded by a ring of organic cement.
Trigonopyxis arcula
Trigonopyxis arcula