Euglena are unicellular protists that have animal and plant-like characteristics. I share this quick video in my online bio labs (not personal content) and you can clearly see the red "eye-spot" that responds to light. It is in no way a "true eye", but one of the most primitive examples of a distinct light sensing organelle that influences locomotion.
RedScience18 t1_izt9nkb wrote
Reply to Eye questions: what is the smallest creature with an eye? What is the closest thing to an eye that a non-animal has? by Clay_Pigeon
Euglena are unicellular protists that have animal and plant-like characteristics. I share this quick video in my online bio labs (not personal content) and you can clearly see the red "eye-spot" that responds to light. It is in no way a "true eye", but one of the most primitive examples of a distinct light sensing organelle that influences locomotion.
https://youtu.be/rFCBrpgkmsQ