Jellyfish were soft-bodied marine invertebrates with a gelatinous umbrella-shaped bell and long-trailing tentacles. One known species of jellyfish were the cyborg Hydroid Medusae, which were created by the Karkarodons of the aquatic planet Karkaris. Hydroid Medusae were deployed in large numbers during the Battle of Mon Cala during the Clone Wars. A jellyfish-like species lived in the atmosphere of the planet Cantonica.
- Star Wars: The Clone Wars – "Water War" (First appearance)
- Star Wars: The Clone Wars – "Gungan Attack"
- Star Wars: The Clone Wars – "Prisoners"
- Kanan 4
- "Endangered, Part 2"—Star Wars Adventures 8
- Doctor Aphra 19 (Mentioned only)
- The Legends of Luke Skywalker (Mentioned only)
- Forces of Destiny: The Rey Chronicles (Mentioned only)
- Star Wars: Forces of Destiny – "Shuttle Shock"
- Star Wars Helmet Collection 25 (Databank A-Z: Hydroid Medusas–Imperial Academies)
- Star Wars: Alien Archive