Coriarachne

Coriarachne is a genus of crab spiders that was first described by Tamerlan Thorell in 1870. Over half of described species have been synonymized or moved to similar genera, including Bassaniana, Bassaniodes, and Pycnaxis.
They are found in boreal and temperate regions almost exclusively on tree bark, wooden fence posts and similar areas where they can take advantage of their natural camouflage. They are rather slow-moving and robust, with the crab-like appearance characteristic of the subfamily Thomisinae. Similar to others in its subfamily, they will wait to ambush their prey rather than actively pursuing it. Often these spiders will congregate under loose bark, leaf litter, or similar situations to spend the winter either in the adult or penultimate stage.

Species

it contains four species, found in Europe, Asia, Canada, and the United States:

Coriarachne brunneipes Banks, 1893 – USA, Canada
Coriarachne depressa – Europe, Turkey, Caucasus, Russia, Central Asia
Coriarachne fulvipes – Korea, Japan
Coriarachne melancholica Simon, 1880 – China

Formerly included:

C. fienae Jocqué, 1993
C. floridana Banks, 1896
C. nigrostriata Simon, 1886
C. utahensis
C. versicolor Keyserling, 1880

In synonymy:

C. nakina Gertsch, 1953 = Coriarachne brunneipes Banks, 1893
C. potanini Schenkel, 1963 = Coriarachne melancholica Simon, 1880

Nomen dubium

C. lenta (Walckenaer, 1837