Cochliopodium vestitum (Archer, 1871) emend. Kudryavtsev, 2005

Diagnosis: in locomotion rounded to oval, with numerous subpseudopodia at the anterior margin of hyaloplasm. Very high dome-shaped granuloplasmic mass. One nucleus of vesicular type. Scales consist of a quadrangular base plate, 4 vertical stalks cross-connected at two levels and a wide funnel-shaped top part formed by 4 concentric rings and 24 radial spokes originating from the vertical stalks. Some of the scales with a sharp spine (10-14 µm in length) originating from the center of a top part. Side of the base plate 0.6 µm, diameter of the top part 0.8-0.9 µm, height of the scale 0.71 µm.

Dimensions: Length in locomotion 39-70 µm (mean 59 µm), breadth 48-74 µm (mean 65 µm), length : breadth ratio 0.6-1.08 (mean 0.9); nucleus 13-15 µm in diameter (mean 14 µm), nucleolus 6-8 µm in diameter (mean 7 µm).

Habitat: fresh water, different water types.

Remarks: Specimens from one ditch in the Naardermeer, and Den Treek, in the Netherlands, were all filled with zoochlorellae. Maybe this is an other species. Species distinction is only possible with an electron microscope, as the shape of the microscales is an important key characteristic.