Chlorocruorins - Respiratory Pigments
These types of respiratory pigments are found in four polychaete families: Sabellidae, Serpulidae, Ampharetidae and Chlorhaemidae. The pigment is found in plasma solution and bears close identities to the extra-cellular Hemoglobins so generally found dissolved in the blood of annelids. Chlorocruorins are large molecules, along with molecular weights nearly 3 million. In dilute solution chlorocruorins are greenish, but in concentrated solution, they are red in color.