• Ákos KereszturiEmail author
  • Veli-Petri Kostama
Living reference work entry


Spider-like volcano-tectonic structure on Venus with inner concentric and outer radial lineament (fracture and ridge) systems (Head et al. 1992).


Arachnoids show a corona-like appearance of concentric or circular shape and also exhibit a radial pattern of ~100 km-long, <10 km-wide fractures that extend outward to several radii of arachnoids (Aittola and Kostama 2000). These linear features often follow the regional lineament and tectonic pattern (Krassilnikov 2002). Where arachnoids are located close to each other, the associated lineaments often form a chaotic and interconnected weblike texture (Head et al. 1992).

Some arachnoids show central depression at their interior (some display interior domes) and may show interior lava flows or small shield volcanoes. They resemble “coronae,” but despite the general similarity of the central structures, arachnoids do show differences from coronae. Arachnoids are dominated by a radial pattern instead of a circular...


Radial Fracture Mantle Upwelling Shallow Magma Chamber Lava Effusion Tectonic Pattern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Konkoly Thege Miklos Astronomical InstituteResearch Center for Astronomy and Earth SciencesBudapestHungary
  2. 2.University of OuluOuluFinland