Sac spiders are spiders that make a kind of silken sac in which they lay their eggs.
The following families are included in the common named group of "Sac spiders":
Anyphaenidae, Tengellidae, Zorocratidae, Miturgidae, Liocranidae, and on this page the Clubionidae, Corinnidae and Gnaphosidae.
Family Corinnidae
Worldwide this family contains 75 genera with over 900 species mostly in the tropical and sub-tropical regions. Many of the species mimic ants on which they hunt.
Nyssus coloripes, previous name Supunna picta,
The
Orange-legged Swift spider or Nyssus coloripes is one of the fastest spiders in Australia. While running, it waves its two forelegs above its body, mimicking the two antennas of a wasp.
The front two legs have a brown tinge. Male and females are identical and their length varies between 5 and 7 mm.
This species is closely related to much larger Supunna albopunctum (7 - 12 mm) but this spider has two rows of white dashed spots on its abdomen.
In autumn and winter the females construct a flat very white disc shaped egg-sac of 5 - 6 mm. The spider feeds on ground dwelling insects and spiders.
