Opilio parietinus is a species of harvestman found in Europe and North America. It is similar to O. canestrinii, but has dark spots on its coxae, and is generally more of a grayish green color. Like O. canestrini, it was often found on house walls in Central Europe, but has by now almost everywhere been replaced by this invasive species.Bellmann, Heiko (1997): Kosmos-Atlas Spinnentiere Europas. Kosmos. (in German)
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Further reading
Joel Hallan's Biology Catalog: Phalangiidae