"Floaters" - Massive colonial organisms that spend most of their time in the air, or in gigantic, pulsing masses on the ground, they share a common ancestor with the organisms considered analogous to animals on Earth, but this ancestor was before both became multicellular. They appear to be mixotrophic, with each colony having various members dedicated to doing specific tasks. The ones that constitute the topmost layers of their body can photosynthesize, and the ones at the bottom can be used either for feeding/drinking, or for gathering extra gases if it is not producing enough inside. Most species have symbiotic relations with various microbes that can release gases such as methane, hydrogen, etc, into their body cavity, allowing for lift. Of note is that aquatic species use this to control their depth in the water column. The insides are filled with cells that can easily form a makeshift stomach extremely quickly, with flagella-like structures that can keep a prey item in place while the other cells drain it dry. They do not fossilize well, due to having no hard parts, but evidence suggests they are extremely ancient, and have survived out many, many mass extinctions, even ones that would put an organism like this in danger. Unlike their animal relatives, they do not reproduce sexually, but instead, grow buds that form off into new individuals. While they can't have actual sex, they can exchange cells between colonies, in a process analogous to horizontal gene transfer. As they are fairly slow, even in the air, they are often preyed on by animals, but some have unique relations with them, such as some floater species having symbiotic relationships for protection. Aquatic species exist as well, and it is believed the current line of species that all exist are descended from an aquatic ancestor, due to evidence of a gamma ray burst during the Cambrian of Earth that hit this planet. It also seems they have genes that show this, with excessive amounts of antioncogenes being common in these organisms, as well as extremely convoluted mechanisms to destroy diseased or cancerous cells.