Behavioral wavelength discrimination tests (Δλ functions) in stomatopods revealed a surprisingly poor performance, ruling out color vision that makes use of the conventional color - opponent coding system (6 — 8). (science.sciencemag.org)
One of the most complex eyes in the animal kingdom can be found in species of stomatopod crustaceans (mantis shrimp), some of which have 12 different photoreceptor types, each sampling a narrow set of wavelengths ranging from deep ultraviolet to far red (300 to 720 nanometers)(1 — 3). (science.sciencemag.org)
Stomatopods use multiple photoreceptors to allow rapid color recognition rather than color discrimination. (science.sciencemag.org)