Faunalization

Faunalization is a unique phenomenon on Sagan 4 in which many unrelated cells have evolved into complex multicellular fauna independently. This may happen as a result of many "basic" niches being unfilled, an artifact of species gaining complexity incredibly quickly and often replacing their ancestors.

Examples
This list may be incomplete.


 * Plents
 * Binucleid Worms
 * Carpofauna
 * Anipedes
 * Mason Fauna
 * Ukfauna
 * Arrowheads
 * Whorls
 * Iron Fauna

Faunalization on Earth
On Earth, the appearance of new fauna evolving from cells is generally prevented by competition with established animals, and complex fauna have thus only evolved once. However, this has not actually stopped simple non-animal fauna from evolving at least 3 times. Two extant lineages of cellular slime molds from nearly opposite ends of Eukaryota and an extinct cell of unknown relation convergently gained the ability to form into multicellular slug-like creatures, or "grexes", for the purpose of dispersal. Further, Earth is also home to complex animal-like cells, most famously Cilliates, some of which are capable of growing to the size of insects.