Common Crab Spider Xysticus cristatus

The Common Crab Spider, named "crab" after the way they hold their front legs, like other crab spiders is an ambush predator that doesn't build webs. It is a ground hunter whose prey includes ants.

Females grow to some 8mm long and males to 5mm. Both have a distinguishing, well-defined dark triangle on the head/thorax with a sharp end point (the related, similar Swamp Crab Spider, X. ulmi, doesn't have the sharp point). The abdomen also has triangular marks.