Difflugia echinulata Penard, 1911
(=D. spinosa Stepanek, 1963)
Diagnosis: Test oblong-oval, shaped like an acorn, tapering to the pseudostome. At the end there are numerous different-sized hollow spikes of different shapes, located asymmetrically. These spikes are clogged with transparent quartz particles. Similar to D. immanata, but larger, and spikes of D. immanata are located on one side of the main axis. Pseudostome round.
Dimensions: Length 133-190 µm, width 63-100 µm, diameter of the aperture 33-45 µm.
Ecology: Freshwater, wet green mosses.