Although I do not see eyespot and flagella, surely Euglena genre.
Nice photos.
What micro, objective, technical (oblique light, DIC?) and camera did you use?
Thanks for the id. help Jacek.
I found the pics of these that you posted in June 2013 and they are great.
Carlos
My setup = Nikon Optiphot 2 + Canon EOS Rebal T4i + Nikon 2.5 relay lens
These pics are oblique light. I think I was using Nikon 20X/0.75 PlanApo