Difflugia brevicollis
Difflugia brevicolla, 70 µm

 

Difflugia brevicolla Cash & Hopkinson, 1909

Diagnosis: Shell transparent, yellow or light brown, spherical with a short neck; this neck, in ventral view, varies from being easily visible to being obscured by shell components, but at either extreme it is usually apparent in apertural view; shell composed mainly of a mixture of small diatom frustules, small pieces of quartz and siliceous cysts of chrysomonad flagellates; aperture circular with a regular even outline.

Dimensions: Length 66-110 µm; breadth 48-97 µm; diameter of aperture 22-42 µm; my measurements: 70-115 µm.

Ecology: Freshwater sediments, Sphagnum.

Remarks: The organic cement is only occasionally visible because the shell material is so well packed, but it appears either as a matrix with small rings or as small spheres and rings. A smooth cyst membrane seals the mouth of the aperture in some specimens.

Doubtful species.

     

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