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Walnut Orb-Weaver Spider

Nuctenea umbratica


The walnut orb-weaver spider is very wide and flattened, with a leathery skin. Its color ranges from red brown and grey brown to black with a dark, yellowish to yellow-greenish leaf-like fleckled marking on its opisthosoma, where small dents are visible. These are the onsets of muscles that flatten the abdomen. Female N. umbratica can reach up to 15 mm in size, the males grow only up to 8 mm.


The spider hides during the day outside of buildings in wall crevices, or under loose bark. They are very common in Central Europe; females occur all year long, while males appear mostly during summer. This spider has a flattened body, helping it to secrete itself in cracks and crevices. Walnut orb-weaving spiders are capable of concealing themselves in very confined spaces. This tends to act as a defensive advantage and increases the amount of locations an orb-web can be effectively constructed. In the evening the spider constructs an orb-web that can be up to 70 cm in diameter. A signaling thread leads from the web to her hiding place. After dusk she sits in the web's center. This spider is capable of biting humans, causing itchiness and a burning sensation followed by a red patch with white lumps


spotted in the river Homem Félinhos beach


Hema  Shah
Hema Shah 11 years ago


:) i presume they are all carnivoire ,if they eat lichen's this tree would be like a paradise

Hema  Shah
Hema Shah 11 years ago

Is there anything like Lichen eating spider?

Braga, Portugal

Spotted on Sep 3, 2012
Submitted on Sep 28, 2012

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