- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
These creatures are very useful for filtering toxins from humanoids. Dr. Phlox carries a supply onboard Enterprise NX-01, but he prefers the fresh ones from Regulus. When Travis Mayweather was given an antigenic compound that caused a bad reaction, Phlox suggested using these to filter out the toxins.