Gelatinous lifeform
A gelatinous lifeform was a lifeform that existed in a gelatinous state, or in the form of a gel or jelly.

Travis Mayweather once pulled a practical joke on Hoshi Sato when he called her down to decon, claiming to have "brought some kind of gelatinous lifeform aboard," adding that he thought "it might be sentient, that the Captain needed me to figure out how to communicate with it." She later found out that it was not a lifeform afterall, and that "it was only strawberry gelatin." ()

In their natural state, Changelings existed as gelatinous lifeforms, as they lived in a gelatinous state. () Odo often explained the he regenerated by reverting to a gelatinous state, something he once described as "relaxing". () Arissa, upon learning this fact about Odo, claimed that she was so tired, that she "wouldn't mind being in a gelatinous state myself." () 

Lifeform classifications