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Paramecium is a genus of unicellular ciliated protozoa that are found in freshwater, brackish, and marine environments. It makes its first and only appearance in "Valentine's Day."
It only appeared in the episode "Valentine's Day," when Patrick was guessing what SpongeBob got for him for Valentine's Day. The first guess was a tent, and the second guess was a random guy in the carnival, both wrong. The third guess was a genus of paramecia under a microscope, with Patrick asking "This paramecium?" This guess was wrong as well. The paramecium that Patrick was looking at was most likely the genus Paramecium Aurelia.
- Paramecium on Wikipedia