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:

1Shell colorless or yellowish to brownish yellow2
Shell wine red to purple red or purple
3
2Shell yellow to brown yellow, hardly covered with xenosomes; protoplasm with zoochlorellaeH. sphagni
Shell colorless, usually covered with many xenosomes
3Shell wine red, with yellow lipH. rosea
Shell purple red to purple, without yellow lipH. 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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