Leg-colour-dimorphism
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Nebria gyllenhali
Nebria gyllenhali is a ground beetle in the family Carabidae found in Iceland and the Faroe Islands. The species exhibits leg-colour dimorphism, with populations containing both red-legged and black-legged individuals. In Iceland, the frequency of red-legged individuals correlates strongly with geographic and climatic variables, being lowest in the south and highest in the north and west. On the Faroes, the pattern is less distinct but shows highest frequencies in the south. The genetic basis of this dimorphism remains to be confirmed experimentally.