Scientists have discovered a half-billion-year-old creature that is considered the earliest known asymmetrical animal. The fossil, named Quaestio simpsonorum, was found in South Australia's Nilpena Ediacara National Park and dates back to the Ediacaran period (635 million to 541 million years ago). The unique "backward question mark"-shaped protrusion on its back is a groundbreaking evolutionary trait that shows evidence of early animal development.

Source: https://www.livescience.com/animals/extinct-species/half-a-billion-year-old-marine-roomba-is-earliest-known-asymmetrical-animal