Clathrulina elegans

Genus Actinosphaeridium Zacharias, 1893

Actinosphaeridium pedatus Zacharias, 1893
Syn.: Nucearia caulescens Penard, 1903

Diagnosis: cell surrounded by a mucous layer with space between the layer and the cell body. Filopodia with granules, sometimes branching. Where the filopodia go through the mucous layer, the layer is lifted a bit like a tent by its pole. Cell stalked; stalk ends at the mucous layer, not at the cell body. During cyst formation the cyst is covered with siliceous plates.

Ecology: I found two specimens in a sample from a peatbog in Austria, collected by Angie Opitz in 2015.

Remarks: The mucuos layer is very hard to detect. It’s possible that Zacharias and Penard have considered the inner wall of the layer as the outer wall.
Taxonomic status is unclear.

Clathrulina elegans
Clathrulina elegans
Habitus, branched filopodium
Clathrulina elegans
Clathrulina elegans
Phase contrast; arrows point to spots where filopodia “push” the mucuos like a tent pole.
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