 "Synchiropus picturatus" is one of only two animal species known to have blue coloring because of cellular pigment, the other being the closely related "Synchiropus splendidus".The name "cyanophore" was proposed for the blue chromatophores, or pigment-containing and light-reflecting cells.In all other known cases, the colour blue comes from thin-film interference from piles of flat, thin and reflecting purine crystals.