Sappharina copepod,transparent copepod crustacean that can change color in blue tones when his body reflects the rays of light, Copepod crustaceans are the most abundant organisms among the zooplankton, numbering more than 14,000 species. These arthtopod range in size from 0.2 to 10 millimetres and occupy nearly all marine and freshwater ecosystems. Black Water Diving, Atlantic Ocean, S.E. Florida, Gulfstream Current glide,"In the case of blue sea sapphires, these crystal layers are separated by only about four ten thousandths of a millimeter; about the same distance as a wavelength of blue light. When blue light bounces off these crystal layers, it is perfectly preserved and reflected. But for other colors of light, these small differences in distance interfere, causing the colors to cancel out. So while white light is composed of all colors, only blue light is reflected back. This type of coloration is known as structural coloration, and though resembling a gem in hue, a sea sapphire's color has more in common with an oil sheen than a pigmented jewel. Combine this nifty trick with the sea sapphire's impressively transparent body, and you have an animal as radiant as a star in one moment, and invisible in the next."
This male Sappharina copepod reflects and diffracts light through tiny plates situated in the epidermal cells covering its surface. Depending on the orientation of the animal, its flat body switches from fully transparent to brightly coloured. Sapphirina are most abundant when their hosts, the salps, proliferate.Black Water diving over Gufstream Current,depth 600 ft. Full moon, Super moon, with Pura Via Divers, off Singer Island, Florida