Phylum: Cyanobacteria Family: Merismopediaceae
Aphanocapsa incerta G. Cronberg & Komárek
'Frequent in plankton of shallow, moderately nutrient-rich standing waters.' - John, et al.
References:
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles