Microworld

world of amoeboid organisms

Pellita catalonica
P. catalonica, cc=cell coat, tips of subpseudopodia penetrating the cell coat are arrowed (after Smirnov and Kudryavtsev, 2005)

Pellita catalonica Smirnov and Kudryavtsev, 2005

Diagnosis: Locomotive form about 20 µm long (measured range 10-33 µm, mean 19.8 µm), and about 15 µm broad (7-25 µm, mean 15.2 µm), average length/breadth ratio 1.2 (range 1.0-1.9). Mononucleate, nucleus ovoid, 4-6 µm in maximal dimension, with several peripheral nucleoli. Cell coat about 500 nm thick, with a basal fuzzy fibrous layer about 100-120 nm thick, and the glycostyles making up the rest.

Ecology: Marine, found in cyanobacterial mats in the Ebro Delta (Catalonia, Spain), salinity 70-80%. Also found in sandy sediments of the shallow-water Niva Bay, Denmark, average salinity about 15%.

Remarks: Resembles with the light microscope a member of the genus Paragocevia, but differs from it because the cell coat envelops the entire cell. Can be easily distinguished by electron microscopy from the unique structure of the cell coat. May be confused with Vannella, but clearly differs by the presence of short projections on the ventral surface of the cell and by the structure and thickness of the cell coat.

Ferry Siemensma, created March 3, 2019; last modified November 01, 2023
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