There are many kinds of clams, some of them very large. The bigger ones are classified as "giant" clams. All were thought to be known. However, a new species has been identified. Examples were found at Ningaloo in Western Australia and near the Solomon Islands.
The reason it has been overlooked for so long is because it is very similar to Tridacna maxima, which is quite common. There are a plethora of colors including yellow, green, brown and blues. They are in many different shades of these main colors.
Clams produce large amounts of edible meat for human consumption. Their shells are also valuable for displays. Many species are under threat. They cannot run away and hide from divers and snorkelers. Two similar species in the same region means numbers for each are lower than first thought.
Conservation by Ty Buchanan