This is the fossil of an ancient, shrimp-like thing that lived in the oceans more than half a billion years ago.
It's from a period in Earth's history called the "Cambrian explosion". Beforehand, the world was dominated by simple, single-celled organisms; suddenly, there was a profusion of complex life.
It's pretty amazing to find anything that old. But the C. kunmingensis is especially exciting, because unusually, its nervous system has been preserved.
The discovery will teach scientists huge amounts about how nerves and brains developed when complex life first arose.
A small, vaguely eel-like creature called Metaspriggina walcotti was swimming around at about the same time as C. kunmingensis.
Tom Chivers is a science writer for BuzzFeed and is based in London.
Contact Tom Chivers at firstname.lastname@example.org.
Got a confidential tip? Submit it here.