The Mediterranean scallop (Lat. Pecten jacobaeus). This species appears to be endemic to the Mediterranean Sea and it lives on a muddy bottom. It usually reaches a length of about 120–140 millimetres. The two valves have different shapes. They show 14 to 16 ribs (radial wrinkles) with a more or less rectangular cross section. The inside of the valves is porcelain-like smooth. The mollusc has at the edge of the mantle many short tentacles. By quickly closing of the two valves it can swim away several meters in case of danger. These scallops eat planktonic organisms and other floating food particles, which they obtain by filtering sea water with their gills. Scallops of this species are collected commercially for human consumption using such techniques as the Rapido trawl.