Megaphragma mymaripenne is a microscopically sized wasp. At 200 μm in length, it is the third smallest extant insect, comparable in size to single celled organisms. It has a highly reduced nervous system, containing only 7400 neurons, several orders of magnitude fewer than in larger insects. This is the smallest known number of neurons in all insects and in all flying animals. Its average lifespan at adulthood is 5 days.