N. guttata, 75 µm, pores arrowed

 

Nebela guttata Kosakyan et Lara, 2012

Diagnosis: The test is colorless or slightly brownish, tear- or drop-shaped, with a protruding narrow neck, laterally slightly compressed, with small lateral pores (number of pores can vary). Test composed of small particles (likely obtained from preys, e.g. euglyphid testate amoebae), which often can be covered with thin layer of organic cement. The aperture is oval, curved.

Dimensions: Length: 80 89 µm, breadth: 5365 µm, width of aperture: 20 22 µm; neck 7.4 ± 0.3 µm high (n=5). My measurements: L 51-78 µm

Ecology: Peatlands, in Sphagnum.

Remarks: Nebela guttata resembles N. tincta, from which it differs by its narrow protruding curved aperture and slender drop shape of the test.

Nebela tincta
Nebela tincta
Nebela tincta
Nebela tincta
Nebela tincta
Nebela tincta

These six shells of Nebela guttata were present in one droplet. It shows the large variation in shell structure within a population. The plate scales come from the shells of Trinema and Corythion species.

Nebela tincta
Nebela tincta
Aperture of Nebela guttata and specimen with narrow aperture, 76 µm.
Nebela tincta
Nebela tincta
The dark spots are granules or pores in the organic matrix; The arrows point to the pores.
 
 
 

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