Phylum: Euglenophyta   Family: Euglenaceae

Trachelomonas hispida (Perty) F. Stein

Found in mainly stagnant waters, both alkaline and mildly acidic, amongst plankton and detritus

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles