arachnid structure (arachnoids) A strange pattern of ridges, gathered in braids and belts, which merge with radial and concentric ridges to give a ‘spiders and cobwebs’ appearance on the surface of Venus, particularly in the area between Sedna Planita and Bell Regio (about 43° N, 19° E). The ridges are large, 100–200 km long and up to 20 km wide.
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