Trapdoor spiders prefer the warmth of the underground. They do not weave webs like other spiders, but dig burrows with a cork-like trapdoor which is something of an engineering marvel. The door is made out of silk produced by its saliva, mixed with vegetation and mud. This cozy place is where they spend most of their life.
Trapdoor spiders stealthily hunt their prey with the help of the camouflaged trapdoor. The prey will not even be aware of the presence of the spider as it quickly pops out of the burrow to hunt. Like most other spider species, the males are smaller than females.


Common name Trapdoor Spider
Scientific name Bothriocyrtum Californicum
Weight Approximate 17 to 30 grms
Length Approximate 25 to 40mm
Color Yellowish brown to reddish, brown to black
Mating Season Summer
Number of eggs Approximate 200 to 300
Habitat Underground and warm places
Lifespan 5 to 20 years


Egg:Trapdoor Spiders lay thousands of eggs. They wrap the sheet and eggs with more silk to form an egg sac. They lay eggs in a sheet of silk. The egg sac helps shelter the eggs from the weather and from predators. Inside each egg, the yolk provides nutrients for the body to grow.

Spider Lings: Spider lings are ready to hatch within a few weeks after the eggs are laid. They break their eggs with a small, sharp growth near the base of their palps. The tiny spiders do not have any colour and their bodies are not yet fully formed. They molt once or twice before they are ready to leave the sac. Once they develop the colour, they are ready to leave the sac.
The life span is between 5 to 20 years and they take several years to reach maturity.

Damage:The bite of the Trapdoor Spider is of low risk (non toxic) to humans. It is a non-aggressive spider and is usually timid. However, it may stand up and present its fangs if harassed. It bites rarely, but when they do so, it can be very painful.