N. collaris, 128 µm long – Tirol, Austria (image stacked)

 
Nebela collaris (Ehrenberg, 1848) sensu Kosakyan et Gomaa, 2013

Diagnosis: The test is large, pyriform, slightly yellowish or brownish, laterally compressed with small lateral pores (number of pores can vary), which can be difficult to observe. The test can be composed mainly oval or circular test plates or can be composed only of organic cement. The neck is very short or almost absent, with aperture, which can be linear, slightly or strongly curved, surrounded by an organic collar.

Dimensions: Length: mainly 109-112 µm, extremes reported: 95-115, breadth 74-81 µm, L/B ratio 1.4. Aperture 28-32 µm wide.

Ecology: in Sphagnum swamps, mosses, aquatic vegetation in peaty bogs.

Remarks: The formation of the shell of N. collaris has been described by MacKinley (1936) who noted that in the absence of other smaller testate amoebae as a source of food, the shell wall consisted of a membrane devoid of shell plates.

N. cf collaris, 160 µm long – Vosges, France (image stacked)

     

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