Sharks and Rays are primitive chordates with a skeleton of relatively flexible cartilage instead of bone. Although they are not always seen, they are often the best remembered creatures encountered on scuba dives with us in the Gulf of Thailand.
These superb creatures have changed little in millions of years, because they were ideally adapted to their environment. Until we came along and started interfering with nature. (3 Galleries)
Flat, bottom dwelling and feeding, cartilaginous fish with one or more barbed stings on the tail, which are used exclusively in self-defense. (3 Galleries)