Symbiotic lifeform
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A symbiotic lifeform is an organism which closely shares its existence with another species, usually for mutual benefit. A symbiotic lifeform may even merge with its host or symbiont.
Symbiotic lifeforms include:

- An unnamed host organism which managed to gain access to the NX-class starship Enterprise in 2152. (ENT: "Vox Sola")
The symbiotic lifeform in this particular episode was a CGI model built by John Teska at Foundation Imaging. Effects supervisor Elizabeth Castro recalled, "The hardest part was the creature. They did it practically on the set, and they also wanted it to have these CG tendrils reach out and pull people up and out of the frame; they wanted to see the tendrils flicking around. To enhance it they had a lot of goo, which they painted all over the practical model right before they would roll so that you would see bits dripping on the actors. That helped us to match the CG."(Star Trek: The Magazine Volume 3, Issue 7, p.55)
- The magnetic organism found aboard the Insectoid pod ship in orbit of Questar M-17. (TAS: "Beyond the Farthest Star")
- The Ceti eel, indigenous to Ceti Alpha V. (Star Trek II: The Wrath of Khan)
- Neural parasite aliens attempted to infiltrate Starfleet Command in 2364. (TNG: "Conspiracy")
- In 2372, the crew of the USS Voyager encountered a species of orchid that has symbiotic properties. It used its lysosomal enzymes to merge itself during transport at the microcellular level with Lieutenant Tuvok and Neelix, to create Tuvix. (VOY: "Tuvix")