Escape reflex
Crayfish: the sensory hairs of the tail fan of crayfish are connected to a reflex arc. Giant sensory and motor nerves are connected with electrical synapses. This flicks the tail, and shoots the crayfish away from the stimulus. The neurons bypass the main neural system that controls locomotion, so shortening the reaction time. The lateral giant connection to motor giant fast flexor neurons was the first known example of an electrical synapse.