I don't believe that gas giant life is really possible. It's not that no life could possibly survive there, but it's really hard for life to adapt to the conditions of a gas giant, especially since you mentioned that in your scenario, the life arose on an Earth-like planet. And I also don't see how a gas giant that engulfs an Earth-like planet can have a high-enough concentration of organic material in its atmosphere. (Of course, that's less of a problem if this is inorganic life.) Finally, it's extremely difficult for liquid water to exist in any state viable for life's survival on a gas giant.

In general, I'm not a huge stickler about life having to exist on a planet almost exactly the same mass as the Earth with water on 70% of its surface, 150 million kilometers away from a G0 star, and with a large moon to stabilize its orbit. All of that is extremely unnecessary. But there certainly is a limit as to how different from Earth a planet can be and still support life, and I think gas giants are probably beyond that limit.

I'm still a supporter that alien life might be a lot more, well, alien, then a lot of us think it might be. I'd say it's entirely possible that life could exist on a gas giant. If you want to have a project about it, go ahead, although if you're trying to make it as plausible as possible the only people who might be able to help are on the forum, not on the wiki.

*ahhhhhem*

I'd say I know a fair bit about exobiology. But I've never worked with gas giant life, because once again I don't find it too plausible. I'm sure I can help with other types of alien life, but I can't quite get myself to figure out the biology of gas giant organisms.

Well, I could use some advice on Calida. Which do you think is more likely: a circular organism turning into a cnidaria-like organism and the bells turning into limbs, or a circular organism strecthing out into a worm with frills on the side?

You can go ahead and delete Tawhiri for right now since I'm still not sure about it myself. I just can't convince myself that the microbes will evolve to collect water in the atmosphere.

The bells turning into limbs just doesn't seem like a plausible way to repurpose them. I'd definitely go with the worm with frills because they seem to resemble flatworms, some of the most primitive organisms on Earth.

Also, I just deleted Tawhiri, but if you want to restore it, just tell me.

How about bells turning into branches or a similar structure?

Can you be a bit more specific?

The bells are structured with fibers that eventually turn it into a structure similar to a daisy flower.

(Sorry for the late reply.)

Yeah, that seems pretty plausible.