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Nigma walckenaeri
Nigma walckenaeri


Nigma walckenaeri
Nigma walckenaeri are a species in the genus Nigma, in the order spiders (Araneae), the suborder Araneomorph spiders (Araneomorphae), the division Entelegynae, the superfamily Dictynoidea and the family Dictynidae. Scientific synonyms for Nigma walckenaeri are: Nigma viridissima, Aranea viridissima, Drassus viridissimus, Ergatis viridissima, Argus viridissimus, Dictyna viridissima, Dictyna walckenaeri, Heterodictyna viridissima and Heterodictyna walckenaeri.
Nigma walckenaeri - Front view
Nigma walckenaeri - Front view
Nigma walckenaeri are found in the southwestern Palearctic from Central Europe to North Africa and from Britain to the Middle East. They have not been observed in Ireland, Scandinavia and the Baltic States. In Germany, Nigma walckenaeri are relatively rare and they are only encountered in appropriately warm habitats in any number. It is suspected that Nigma walckenaeri are under threat.
Nigma walckenaeri love warmth and were originally mainly found in southern Europe. They are also common in northern Germany where they live almost exclusively in areas inhabited by humans. They prefer gardens or overgrown sunlit facades. Here they can be found on the leaves of herbs, shrubs, and climbing plants (ivy, wild wine), but rarely on such broad-leaf bushes as Syringa (Lilac). Due to its camouflaged appearance the Nigma walckenaeri is difficult to see. In the warmer parts of Europe, it lives in sunny forest edges and in clearings. It can even be found inside buildings.
Nigma walckenaeri are diurnal and can be encountered from August to October (in and around buildings until December). In the morning, after sunrise, they build a transparent tissue, on the upper surface of leaves with upward curving edges, which resembles a tent and serves as a shelter. In order to build a web to catch insects, separate fibres of silk are excreted from the spinnerets into many extremely fine fibres, giving the web a wooly structure.
After mating, the females erect a cocoon for the eggs. The white cocoon is 6 - 7 mm in length and is hidden, at a slight distance from the hideout of the spider. After reaching maturity (after the last moult) the life expectancy of the males is very short, and most die shortly after mating.


Description of images / photos
Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Nigma walckenaeri
2. Nigma walckenaeri - Front view
Keywords
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