world of amoeboid organisms


Pellita digitata (Greef, 1866) Smirnov and Kudryavtsev, 2005

Diagnosis: Locomotive form about 85 µm long (measured range 54-106 µm, mean 84.5 µm) and about 80 µm broad (54-115 µm, mean 81 µm), average length/breadth ratio 1.06 (range 0.75-1.38). Mononucleate, nucleus rounded, vesicular, 10-14 µm in diameter (average 12 µm). Single central nucleolus 5-7 µm in diameter (average 5.7 µm). Cell coat about 850 nm thick, of which the basal fuzzy fibrous layer makes up about a half; the rest formed by glycostyles.

Ecology: Freshwater, in aquatic mosses in Great Britain (Cash and Hopkinson 1909); Lake Leman, Switzerland (Penard 1902), and North-Western Russia.

Remarks: Resembles a member of the genus Paragocevia or (to a lesser extent) Cochliopodium, but differs from both because the cell coat envelops the entire cell. 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. Differs from P. catalonica in cell size and thickness of the cell coat.

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