Symbiotic Protists

the good, and the bad!

Good and bad relationships

We all have friends and enemies. Protists LOVE to have friends through mutualist relationships. They also keep their enemies as close through parasitic relations.


  • Mutualistic Symbiosis: both organisms benefit from each other. "You scratch my back, I'll scratch yours."
  • Parasitic Symbiosis: only one organism benefits while the other is harmed. Sorta like someone befriending you, only to talk about you behind your back.



While you learn about examples of these types of symbiotic relationships, you'll be able to find out what type of relationship Wicket had with one particular friendly protist.

What is the difference between mutualistic and parasitic protists?


  • Categorize the following examples as mutualistic or parasitic (be sure to include the name of the protist involved)
  • How they are a positive or negative relationship?


Death by Tsetse Fly

Leishmania protista

Monsters Inside Me: Leishmania
Giardia Is a Threat To Dogs, Cats, and People

So what happened to Wicket?