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Heleopera sylvatica
Heleopera sylvatica, each 69 µm, dividing

Heleopera sylvatica Penard, 1890

Diagnosis: Shell slightly yellowish, transparent, obovoid, flattened about 2:1, composed of siliceous shell platelets from other testaceans and sometimes rough xenosomes, found mainly in aboral region. Some individuals are completely covered with such acquired idiosomes. The aboral region often has euglyphid platelets (Euglypha, Trlnema) extending at right-angles like spines. Aperture terminal, slightly convex in broad view, slit-like to elliptic with small border of organic cement. Nucleus with several nucleoli.

Dimensions: Penard (1890): 50-75 µm, Lueftenegger and Foisner (1991): 59-70 µm; my measurements: 66-69 µm.

Ecology: mosses

Remarks: I found these specimens in a sample from mosses on a rock in a wood near Saarburg, Germany.

Heleopera sylvatica
Lobopodia
Heleopera sylvatica
Heleopera sylvatica
Heleopera sylvatica
Heleopera sylvatica
Heleopera sylvatica
Heleopera sylvatica
Heleopera sylvatica, pseudostome and retracting pseudopodia
Heleopera sylvatica
Heleopera sylvatica 66 µm (left), and drawing after Lüftenegger and Foissner, 1991
Heleopera sylvatica
Heleopera cf sylvatica, 103 µm, Ecuador, moss
Heleopera sylvatica
Heleopera sylvatica
74 and 66 µm
Heleopera sylvatica
Heleopera sylvatica
Almost closed pseudostome (left) and nucleus (right)
Heleopera sylvatica
Specimen from dry moss, Saar, Germany, test 66 µm
Heleopera sylvatica
H. sylvatica SEM, arrow points to apertural scale of Euglypha –  from Lüftenegger and Foissner, 1991
Heleopera sylvatica
Heleopera sylvatica
Each test 77 µm
Heleopera sylvatica
Heleopera sylvatica
Nucleus, c. 15 µm
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