Oldest evidence found of color vision cells
G. Tanaka et al/Nature Communications 2014
Examining the eye of a beautifully preserved specimen of the ancient jawed fish Acanthodes bridgei from a 300 million-year-old rock formation in Kansas, scientists have found the first evidence of fossilized rods and cones. Located in the retina, these important cells absorb light and allow animals to see both color and contrast, but the delicate structures usually decay quickly after an animal’s death. Quick burial in a lagoon environment helped preserve this fossil. Early fish saw life in color, Gengo Tanaka of Kumamoto University in Japan and colleagues report December 23 in Nature Communications.
G. Tanaka et al. Mineralized rods and cones suggest colour vision in a 300 Myr-old fossil fish. Nature Communications. Published online December 23, 2014. doi: 10.1038/ncomms6920.
E. Engelhaupt. Find your inner fish with PBS series on human evolution. Science News Online April 15, 2014.
A. Yeager. Ancient fish may have set stage for jaws. Science News Online, June 11, 2014.