Use of different light colours permits easier "identification-marker" visualization and "removes dirt". A. Unfixed Gamarus salinus (Spooner, 1947). Left: "white light", Right: UV light. B. Unfixed Macropodia linaresi (Forest & Alvarez, 1964). Left: "white light" Right: UV light. C. Unfixed Membranipora membranacea (Lineaus, 1767) Left: "white light"; Middle: UV light. D. Chaetae of a polychaete under UV light. E. Illumination with different light colors of Gamarus salinus. Left panel: white light. Left-middle panel: UV light. Right-middle panel: Blue light. Right panel: Green light.