Immunocytic gel worm
The immunocytic gel worm was a corkscrew-shaped organism that lived in a viscous pink fluid. Doctor Phlox kept a jar full of them in the sickbay on  for medical purposes.

Although Phlox allowed Captain Jonathan Archer, commanding officer of Enterprise, to observe the worms in 2151, Phlox told him not to shake them. ()

de:Immunocytischer Gelwurm
Animals