Pessonella sp. (new species)

Pessonella sp. 1-8: locomotive; 9-10: cell, changing the direction of movement; 11-12: nucleus (stained preparation).
Scale bar: 1-10: 20 mkm; 11-12: 10 mkm

Pessonella sp. 1-2: nucleus; 3: cell coat; 4: mitochondria; 5: formation of the food cap; 6: dyctiosome and microtubules in the cytoplasm. Scale bar: 500 nm

  • Locomotive form flattened, fan-shaped or semi-circular. Usualy no differentiated uroid, but when the cell is elongate bulbous uroid may appear. Frontal hyaloplasm uneven, it carries numerous small lobes. Length in locomotion 18-30 mkm (average 27 mkm), breadth 19-38 mkm (average 27 mkm); average L/B 0.93.
  • Floating form radial, star-like, with 5-7 thin, conical, tapering pseudopodia.
  • Single rounded or elongate vesicular nucleus, about 6 mkm in diameter, with a spherical central endosome about 3 mkm in diameter. One contractile vacuole. No cytoplasmic cristals. No cysts found.
  • Cell coat consists of thin layer of amorphous glycocalix over to the cell membrane, about 25 nm in thickness, and a layer of radiating glycostyles, about 100 nm in length. Among the glycostiles there are long simple filaments. Nucleus with central nucleolus, mitochondria have dense matrix and tubular, non-anastomosing cristae.

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