Differential interference contrast (DIC) light micrograph of Trachelomonas volvocina (larger, oval) and Trachelomonas hispida (smaller, spherical) protists. These are flagellated algae with a red 'eye spot' or stigma used for orienting itself towards a light source. Magnification: x400 when printed 10 centimetres wide.
Model release not required. Property release not required.