Mag. 400x (1), 200x (2,3)
A euglenid with a single anterior flagellum, hyaline tail section, and a deeply ribbed pellicle (scales!, see comments) reminiscent of euglenoids Lepocinclis fusca and Phacus monilatus. Metabolic movement was not observed. Link to video https://youtu.be/GlnYtTwJ9YI.