Microworld

world of amoeboid organisms

Menu

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
Recent posts

Penardochlamys arcelloides

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Lachmannia spec.

“Lachmannia” spec., body length 127 µm “Lachmannia” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »

Diplophrys spec. 7

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »