California Trapdoor Spider 

Bothriocyrtum californicum

Color: Dark brown to black, glossy on top

Size: 0.75 – 1.5 inches (2- 4 cm)

Shape: Feathered abdomen, leg suitable for digging

Diet: Insects, arthropods and worms

Habitat: California

General Behavior

They build vertical nests 20 cm deep, lined with silk.

It lurks under the trap and senses vibration.

It catches its prey with its teeth.

Females can live up to 20 years.

Males live shorter.

Threats

Increasing urbanization and agricultural development threaten habitats.

How Do We Recognize Infestation?

Seeing the silk-lined traps they have laid.

Seeing dead insects and their parts.

They are very rarely seen alive.