Crab Spider (Common Ground Crab Spider)

Scientific Name: Xysticus spp.

Order & Family: Araneae: Thomisidae

Size: 3 to 10 mm (body length), with females typically larger than males.

Crab Spider (Common Ground Crab Spider)

Natural Habitat

Commonly found on the ground, in low vegetation, leaf litter, and under rocks or logs. They are widespread across North America and Europe.

Diet & Feeding

Carnivorous; they are ambush predators that feed on insects like flies, bees, and other small arthropods. They do not spin webs to catch prey.

Behavior Patterns

Unlike typical spiders, they do not build webs. Instead, they sit and wait for prey to come within reach. They are known for their crab-like appearance and ability to walk sideways or backwards. Many species can change color slowly to match their surroundings.

Risks & Benefits

They are generally harmless to humans. While they possess venom to subdue prey, their bite is not medically significant and they are not aggressive. They benefit the ecosystem by controlling insect populations.

Identified on: 5/18/2026