Cochliopodium gulosum Schaeffer, 1926, emend. Kudryavtsev, 2000
Diagnosis: In locomotion cells rounded, with length slightly greater than breadth or, rarely, vice versa. The anterior margin of the hyaloplasm bears 2€”3 to 10 subpseudopodia. about 10 um in length. Smooth posterior end. Nucleus single, of vesicular type, with large central nucleolus. Granuloplasm contains small rounded refractile bodies and numerous small transparent vacuoles. Scales consist of a circular base plate, a hollow central column with internal surface covered with a honeycomb-like material and a cone-shaped top part with an internal cavity filled with an electron dense body.
Dimensions: Length of the locomotive form 56-90 µm (mean 80 µm), breadth 56-86 µm (mean 73 µm). Diameter of the base plate of a scale. 1.8-2 µm, of the top part 1.4-1.6 µm. Height of a scale 1.1-1.3 µm. Diameter of nucleus 8-15 µm (mean 12 µm), of nucleolus 6-10 µm (mean 8 µm).
My measurements: locomotive forms 100-110 µm, nucleus 16 µm.
Ecology: marine, tidal pools; North Sea beach, Bergen aan Zee.
Remarks: Species distinction is only possible with an electron microscope. The shape of the microscales is an important key characteristic.
Literature: Kudryavtsev, 1999, 2000.