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Heleopera petricola var. amethystea – stacked image

 

Genus Heleopera Leidy, 1879

Diagnosis: shell always laterally compressed; aperture terminal, lenticular or slit-shaped, with a thin but distinct organic rim; colorless or yellowish, but with reddish or purple species; test composed of collected euglyphid body plates, mineral particles or diatoms, these materials often coated and reinforced  with siliceous material; nucleus ovular.

Ecology: Freshwater sediment, mosses (Sphagnum) and soil.

Key to the species:

1 Shell colorless or yellowish to brownish yellow 2
Shell wine red to purple red or purple
3
2 Shell yellow to brown yellow, hardly covered with xenosomes; protoplasm with zoochlorellae H. sphagni
Shell colorless, usually covered with many xenosomes
3 Shell wine red, with yellow lip H. rosea
Shell purple red to purple, without yellow lip H. petricola var. amethystea

 

Heleopera

Heleopera, with broad slit

Heleopera petricola, with split-shaped pseudostome – stacked image

Heleopera – stacked image

Heleopera petricola – stacked image
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