The spider is nocturnal, spinning a cart-wheel-shaped web at night which it consumes in the morning.

[3] Females are about 8 mm in length and brightly coloured: the upper surface of the abdomen is yellow and olive with two white horn-like 'spines' that give this spider its common name.

[1] The front of the abdomen has a broad band of cream and yellow, and the rear has an upward pointing chevron marking against a red/yellow background.

They lack the horns and the bright colours of an adult female, and at first were thought to be a different species and named Cyrtarachne setosa.

[2] Females can be found guarding a small, papery, brown, spindle-shaped egg sac.