Mayorella penardi Page, 1972
Diagnosis: Locomotive form often with broad blunt anterior end, with L/B ratio usually 1.2-6.5; mammilliform or conical subpseudopodia, often absent, or overtaken by the advancing hyaloplasm; floating form star-shaped, with long slender and pointed pseudopodia; nucleus spherical, with a central nucleolus; small paired crystals, usually < 1 µm observed; cuticula 180-200 nm thick.
Dimensions: Page: 35-125 µm, L/B 1.2-6.5; nucleus 5.6-13.0 µm. My measurements: 60-80 µm; nucleus 15 µm.
Ecology: Freshwater, Europe, North America. I found this species in the Kerf, a dune area along the North Sea coast.