 In 1991, two femora (thighbones), one from an adult and one from a juvenile, were found within a metre of each other at the Dinosaur Cove East site, in the small "Lake Copco" quarry, at the southern tip of Australia.The type species, "Timimus hermani", was formally named and shortly described by Dr Thomas Rich and his wife Patricia Vickers-Rich in 1993/1994.The generic name means "Tim's Mimic" and combines the name of both the discoverers' son Timothy Rich and palaeontologist Tim Flannery with a Latin "mimus", "mimic", a reference to the presumed affinity of the species with the Ornithomimosauria.