This caused some excitement the other day in the Harvestmen group I am a part of. Note that the ‘A’ at the end in the title is not a typo, but is there because scientists have yet to name it! It was first discovered in Europe in the Netherlands back in 2004, and then in the UK in Worksop, Nottinghamshire in 2009. There are a few scattered records as this non-native species extends its range. Despite rigorous searches, its point of origin in the world has yet to be determined.
It has extremely long legs, up to 100 mm (4 in) in length, and an unusual dark metallic green sheen of the dorsal surface, especially in the male. It can form large congregations on shaded areas of walls of buildings which can be counted in their hundreds. Associated with stony ground, and found around buildings like houses and on brownfield sites and old industrial land.