Theridiosoma

Theridiosoma is a genus of ray spiders that was first described by Octavius Pickard-Cambridge in 1879. They use their web as a high speed slingshot to actively hunt for prey.

== Description == Mature spiders in this genus have a body length of 0.5–2.5 mm. The carapace ranges from dark brown to light tan, sometimes with distinct markings around the eye region or fovea, The sternum is smooth, with sparse bristles, and is usually darker towards the margin. A pit organ is present on the anterior margin of the sternum, at both corners. The abdomen is ovoid in shape, and taller than wide or long; the dorsal side of the abdomen often bears a light, thin median band and/or symmetrical light spots, the ventral side is dark. The metatarsi of the legs are typically shorter than the tibiae. As with other spiders in the family, the tibiae of the 3rd and 4th legs bear a group of long, vibration-sensitive trichobothria. Species in this genus exhibit only slight sexual dimorphism; males are similar to females in colouration but are slightly smaller, with proportionally longer legs.