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Trinema galeata
Trinema galeata, after Todorov and Bankov, 2019 (l) and Jung, 1942 (r)

Trinema galeata (Penard, 1890) Jung, 1942

Diagnosis: Shell small, colourless, transparent, ovoid, compressed, with oval transverse section; composed of two types of shell-plates: large, circular, slightly overlapping, of about 10 µm in diameter, and small, oval, of about 3,1-3,4 x 2,4-2,7 µm, which haphazardly fill interstices between large plates. Aperture oval, sub-terminal, oblique, invaginated, surrounded by two or three rows small, circular, denticulate apertural-plates and three to four rows of small shell-plates, which clearly indicate the place of junction of the wide apertural visor with the main body. Cytoplasm granular, fills almost the whole shell; one large nucleus, placed posteriorly in the cell, with single central nucleolus. Pseudopodia numerous, thin, long, sometimes branching, usually well visible.

Dimensions: 41-84 um long; 22-49 µm wide; large scales about 10 µm in diameter, small ones 3,1-3,4 x 2,4-2,7 µm.  diameter of large shell-plates 5.6-10.3; aperture 11-24 µm (Todorov and Bankov, 2019).

Ecology: Mosses and soils, rare in Sphagnum. Probably cosmopolitan.

Remarks: Trinema galeata differs from T. complanatum by the well visible line indicating the place of junction of the wide apertural visor with the main body.

Trinema galeata
Trinema galeata
Trinema galeata, wet moss in my garden pond, the Netherlands 2019
Trinema galeata
Trinema galeata
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