The underwater world in Sardinia: nudibranches

A nudibranch is a soft-bodied mollusk (= invertebrate animal) which leaves their shell after their larval stage. They are famous and loved for their often extraordinary colors and striking forms. There are more than 3,000 described species of nudibranches. The word "nudibranch" comes from the Latin nudus, naked, and the Greek brankhia, gills.

While in Sardinia we were told that nudibranches in the Mediterranean sea love cold water and when the summer start they are more rarely sighed, but we were still lucky enough to discover and see different ones:-) The biggest one is the so called in Italian "vaccheta di mare" (the white with the balk dots, literally the "sea cow"). It can reach up to 10 cm.

Most of the them are however really tiny, from 0,5 to 2-3cm. The bright and impressive colours are signal for predators that the soft body contains venom. This is also their only protection...