Gnaphosidae (ground spiders)
Swift Ground Spider Identification Australia: Gnaphosidae
A fast ground hunter with no capture web, usually recognised by two separated cylindrical spinnerets and angular rear middle eyes.
Usually low riskSwift ground spider is a useful descriptive name for the family Gnaphosidae, but it is not a species name and not every fast spider on a floor belongs to this family. Australian gnaphosids are mostly ground-level hunters found in litter, beneath bark, under rocks and sometimes wandering through buildings. Colour ranges from charcoal grey to reddish or pinkish brown, so colour and speed are weak clues by themselves. The most useful family-level evidence is at the rear of the spider: a pair of large cylindrical anterior spinnerets, separated from each other, combined with angular or oval rear middle eyes. A sharp dorsal photograph may support Gnaphosidae; genus or species identification usually needs finer anatomy.
Quick identification
- Two stout cylindrical spinnerets visible at the rear, usually separated by about their own width
- Eight eyes in two rows, with the rear middle pair commonly angular, oval or silvery rather than round
- Usually a low, elongated or oval ground-hunting body, though the family includes strongly flattened forms
- Runs over litter, soil, bark or floors instead of waiting in an orb, lace or tangled capture web
- Often charcoal, grey, reddish brown or pinkish brown; some Australian genera have shiny or iridescent hairs
What to check next
Photograph the spider from directly above and include the whole abdomen tip so the paired spinnerets can be assessed. Add a close rear view, a clear eye photograph and a ruler beside the spider without touching it. Record whether it was running or inside a small silk resting retreat. Keep the identification at family level unless diagnostic genital or other fine anatomical characters have been examined.
When to seek medical help
Gnaphosidae are not among the Australian spider groups highlighted by healthdirect as medically dangerous. Avoid handling any unidentified spider. For a suspected bite, wash the area and use a wrapped cold pack for local pain. Seek medical advice if pain, swelling or other symptoms are severe, persist or worsen. Call Triple Zero (000) for breathing difficulty, collapse or other signs of anaphylaxis.
Where it is usually seen
Leaf litter, soil surface, beneath rocks and logs, under loose bark, garden beds, woodland and forest floors, arid ground and sheltered floors or sheds. Australian Museum records the family across Australia from rainforest to desert.