The only other sense-organs are the captacula, which are tactile and olfactory.
t, Tactile hairs springing from surface of body.
9, E) that cover the body of an insect have a tactile function.
The tentacles are organs which serve both for the tactile sense and for the capture of food.
In fact, we have to suppose that the actual somite which in grades 1 and 2 bore the mandibles lost those mandibles, developed their rami as tactile organs, and came to occupy a position in front of the mouth, whilst its previous jaw-bearing function was taken up by the next somite in order, into which the oral aperture had passed.