Pieris napi (Green-veined White / Klein geaderd witje) is a butterfly of the Pieridae family. It is a circumboreal species widespread across Europe and Asia, including the Indian subcontinent, Japan and the Maghreb and North America. I posted some more detailed images on this species back in april this year (see here and here).
The underside hindwings are pale yellow with the veins highlighted by black scales giving a greenish tint, hence Green-veined White. Like other "white" butterflies, there is some sexual dimorphism (the sexes differ). The female has two spots on each forewing, the male only one. The veins on wings of the female are usually more heavily marked. So this image shows probably a male specimen.
Although being a very common species in Western Europe, there are still some secrets to be discovered: Recent research has shown that when males mate with a female, they inject "methyl salicylate" along with their sperm. The smell of this chemical compound repels other males, thus ensuring the first male's paternity of the eggs—a form of chemical mate guarding. Wonderfull nature !
Image: Lille (BE) - 21/07/2010
© Johan Dierckx
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All species are photographed in their natural habitat, without cutting or capturing them, and with maximal respect and the least possible disturbance to the environment.
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