If you need ideas for alien critters, look no further than Antarctica. Well, under Antarctica. Photo courtesy of footage provided by the Australian government, and the video linked above is worth checking out.
These structures are holding up under immense pressure and cold, even though they look lacy and delicate. If that’s possible on Earth, then what might grow on other celestial bodies with oceans under ice? What might grow in thick, soupy atmospheres?
The science on life forms is pretty limited by our current knowledge that limits it to carbon-based units. It’s entirely possible that everything in the Earth’s oceans is carbon-based, but maybe they’ll eventually find something that started from a different elemental unit.
All that aside, check out the colors and structures. Consider how those colors might be affected by the various elements present in atmospheres on other worlds. What structures would plant life need to flourish in a heavy sulphur-based atmosphere? Would they use photosynthesis? Would photosynthesis work if you altered the intake chemical? Instead of carbon dioxide, could plants process sulphur? If so, what would they emit?
I’m contemplating some large tree-like structures like this blue and white one, but I’m trying to fit it into the context of a new world. We’ll see how that goes.