Aplysia gill and siphon withdrawal reflex
INVOLUNTARY DEFENSIVE REFLEX
Aplysia siphon-withdrawal reflex; Aplysia gill and siphon withdrawl reflex
The Aplysia gill and siphon withdrawal reflex (GSWR) is an involuntary, defensive reflex of the sea hare Aplysia californica, a large shell-less sea snail or sea slug. This reflex causes the sea hare's delicate siphon and gill to be retracted when the animal is disturbed.