Sac Spiders – Clubionidae
These are small to medium sized spiders that generally live beneath the loose bark of trees such as eucalypts and acacias. They shelter within white silken sacs during the day, and roam the tree trunk and branches at night in the search for prey. Many species are rusty brown in colour and some have very large chelicerae. The are not considered dangerous to humans, although some can give a painful bite.
Example Australian species
Sac Spider – Clubiona robusta (male)
Sac Spider – Clubiona species (female)
Green Sac Spider – Matidia species