Bark Crab Spider

Scientific Name: Bassaniana utahensis

Order & Family: Araneae: Thomisidae

Size: 4 to 7 mm (males are typically smaller than females)

Bark Crab Spider

Natural Habitat

Commonly found on the bark of trees, logs, and under foliage in wooded areas or gardens where its camouflage is effective.

Diet & Feeding

Carnivorous; it is an ambush predator that feeds on a variety of small insects including flies, beetles, and ants.

Behavior Patterns

Unlike many spiders, it does not spin a web to catch prey. Instead, it relies on camouflage to wait motionless for prey to come within reach and then strikes with its front legs.

Risks & Benefits

Benefits the ecosystem by controlling pest insect populations; they are generally harmless to humans and rarely bite unless handled roughly.

Identified on: 5/11/2026