We often have the opportunity to talk with our divers and no-divers friends about the particular underwater living creatures: the ones that can freely swim and the others colorful that spend their life attached to the bottom of the sea, both colorful, luminescent and they have strange and not understandable behaviors. For this reason we thought to suggest a little manual on the marine animal and vegetable species of our sea that simply helps to give some information about them,
 
              
 
make more enjoyable diving and perhaps it helps to better understand the sea life and increase the attention on preservation. On the short sheets that follow we give some biological information about the animal and vegetable living creatures which are developed into the marine environment, their interaction with it, and their anatomical, structural and behavioral characteristics. Have a good diving everyone!