Actinosphaeridium spec.
Diagnosis: Cell surrounded by a membranous shell, with an outer mucous layer. Filopodia with granules, sometimes branching. Cell stalked.
Ecology: I found this specimen in a sample from a peatbog in Tirol, Austria, collected by Angie Opitz in 2015.
Remarks: I’m not convinced that this specimen is A. pedatus, because of the thick mucous layer.
Habitus, branched filopodium
Phase contrast; arrows point to spots where filopodia “push” the mucuos like a tent pole.