Escape reflex
Squid: The squid giant axon is the very large (up to 1 mm in diameter; typically around 0.5 mm) axon that controls part of the water jet propulsion system in squid. It was first described by L.W. Williams  in 1909, but this discovery was forgotten until English zoologist J.Z. Young demonstrated the axon’s function in the 1930s. Squids use this system for making brief but very fast movements through the water.