New Year´s Eve, along the Swedish west coast, Sweden.
Text & Photo © CM Cordeiro & JE Nilsson 2020
While humans have a trichromatic vision, seeing colours in combination of red, blue and green because of light-sensitive proteins in our eyes called opsins, the remarkable dragonfly has no fewer than eleven different visual opsins. Some species of dragonflies have 30 visual opsins [1]. Dragonflies and damselflies are colourful, diurnal insects that depend strongly on their keen sense of vision for an array of activities, from catching small prey in the air to forming territories. The compound eyes of dragonflies contain three to five classes of photoreceptors, with distinct spectral sensitivities covering the UV to red spectral range. These photoreceptors combine to produce a mosaic of images for the dragonfly, although how this visual mosaic is integrated in the insect brain remains uncertain.