Latin name: Araneae (order)
Spiders are widespread throughout Australia and are commonly found in homes, commercial buildings, landscaped areas, and natural environments. Australia is home to a large number of spider species, most of which are harmless to humans and play an important role in controlling insect populations.
Spiders are predatory arachnids that feed on insects and other small invertebrates. While beneficial in gardens and natural areas, spiders can become a nuisance when they enter buildings or establish webs in high-traffic areas.
Spider activity tends to increase during warmer months. In Western Australia, spring and summer conditions encourage breeding and increased movement, often leading to spiders entering buildings in search of food or shelter.
Lifecycle
The spider lifecycle consists of egg, juvenile (spiderling), and adult stages and varies significantly between species.
- Eggs are laid in silk egg sacs, often hidden in sheltered locations
- Spiderlings hatch and disperse, sometimes using silk threads to “balloon” on air currents
- Juveniles grow by moulting multiple times
- Adults mature and reproduce, with some species living for several years
Reproduction rates and lifespan vary widely depending on species and environmental conditions.
Identification
- Two main body segments: cephalothorax and abdomen
- Eight legs and no antennae
- Size ranges from a few millimetres to several centimetres depending on species
- Colour varies widely, including brown, black, grey, and patterned forms
- Many species build webs, while others actively hunt prey
- Often noticed by the presence of webs, shed skins, or sightings at night
Spiders are generally reclusive and avoid human contact.
Damage
Most spiders pose little risk to people, but some species can be medically significant.
- Webs in corners, ceilings, outdoor furniture, and entryways
- Bites are uncommon and usually occur when spiders are trapped or handled
- Some species, such as redback spiders, can cause painful bites requiring medical attention
- Anxiety or fear associated with spider presence
- Reduced amenity in residential and commercial environments
Spiders do not damage structures, furnishings, or plants.
