Red-green opponency in the long visual fibre photoreceptors of brushfoot butterflies (Nymphalidae)

Gregor Belušič, Marko Ilić, Primoz Pirih & Andrej Meglic
In many butterflies, the ancestral trichromatic insect colour vision, based on UV-, blue- and green-sensitive photoreceptors, is extended with red-sensitive cells. Physiological evidence for red receptors has been missing in Nymphalid butterflies, although some species can discriminate red hues well. In eight species from genera Archaeoprepona, Argynnis, Charaxes, Danaus, Melitaea, Morpho, Heliconius and Speyeria we found a novel class of green-sensitive photoreceptors that have hyperpolarising responses to stimulation with red light. These green-positive, red-negative (G+R–)...
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2 downloads reported since publication in 2021.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?