Some spiders live alone, guarding a web that belongs to them and no one else. The foliage webbing spider takes a different approach. During its early life, this small Australian spider shares an elaborate silk nest with dozens—and sometimes hundreds—of its relatives. Together, the young spiders occupy a network of passages woven through the leaves and branches of shrubs.
Known scientifically as Phryganoporus candidus, the foliage webbing spider is remarkable for its temporary social lifestyle, complex three-dimensional webs, and ability to turn ordinary foliage into a sheltered colony. Its behavior offers an unusual glimpse into how cooperation can develop among animals that are typically solitary.
Foliage Webbing Spider: Quick Facts
- Scientific name
- Phryganoporus candidus
- Family
- Desidae
- Common name
- Foliage webbing spider
- Body length
- Approximately 6–10 mm
- Color
- Silvery gray to brown, with darker abdominal markings
- Distribution
- Widespread across mainland Australia
- Habitat
- Open forests, woodlands, scrubland, and shrubs
- Diet
- Insects and other small arthropods
- Social behavior
- Communal as juveniles; generally solitary after dispersal
- Human risk
- Not recognized as a medically important spider
What Is a Foliage Webbing Spider?
The foliage webbing spider is a small web-building species native to Australia. It belongs to the family Desidae, a group that also includes several familiar lace-web spiders.
Unlike spiders that construct a simple circular orb web, P. candidus builds a dense structure of silk around leaves and twigs. The web provides both living space and a means of catching prey.
What makes this species particularly interesting is its periodic social behavior. Spiderlings remain together in a shared nest for an extended part of their development, but this communal arrangement does not normally last throughout adulthood.
This distinguishes foliage webbing spiders from most solitary spiders and from the relatively small number of spider species that maintain permanent social colonies.
How to Identify a Foliage Webbing Spider
Adult foliage webbing spiders are relatively small, generally measuring about 6–10 millimeters in body length, excluding the legs.
Their bodies range from silvery gray to brown. The abdomen typically displays a contrasting pattern of lighter and darker brown markings, while fine hairs may give the spider a slightly silvery appearance.
However, color alone is not enough for a reliable identification. Several unrelated Australian spiders have similar brown or gray markings.
The combination of physical appearance, location, and web structure is much more informative than any single characteristic.
Identification clues
- A small, gray-brown spider with patterned abdominal markings.
- Dense, irregular silk webbing surrounding leaves or small branches.
- Multiple interconnected silk retreats rather than a single open orb web.
- Several spiders occupying the same structure, particularly during the juvenile stage.
- A location in Australian woodland, open forest, or scrub vegetation.
Where Do Foliage Webbing Spiders Live?
Foliage webbing spiders occur widely throughout mainland Australia, particularly in habitats where shrubs and small trees provide suitable sites for constructing silk nests.
They inhabit open forests, woodlands, and scrubland. Their nests may be built among the branches of native shrubs, including thorny vegetation, or in small trees such as mallee eucalypts.
These plants provide a framework for the silk structure. Leaves and twigs become incorporated into the nest, creating enclosed chambers and sheltered passages.
Their habitat is not limited to pristine bushland. Large nests have also been recorded in agricultural environments, including orchards and vegetation used by grazing animals.
How Do Foliage Webbing Spiders Build Their Webs?
The web of a foliage webbing spider is more than a simple insect trap. It is a three-dimensional structure that combines a protected living area with an outer capture zone.
1. Inner retreats and connecting tunnels
The central part of a communal nest contains sheltered chambers connected by numerous silk-lined passages. Multiple openings allow spiders to move through different sections of the structure.
These passages provide hiding places and help separate the occupants from exposed areas of the surrounding vegetation.
2. Outer layers that capture insects
Beyond the retreat lies a network of silk sheets and ladder-like layers used to intercept passing insects and other small arthropods.
The species produces cribellate silk, a type of silk composed of extremely fine fibers. Unlike the familiar glue-coated capture threads used by many orb-weaving spiders, cribellate silk can entangle prey through its fine, woolly structure.
3. Expansion as the colony grows
As young spiders develop, the shared nest may become larger and more complex. Silk accumulates around the surrounding leaves and twigs, sometimes producing a conspicuous mass of webbing.
A nest of this kind may look untidy from the outside, but its internal organization supports shelter, movement, and prey capture.
Interesting fact: Australian Museum research describes communal nests containing between 9 and 224 spiders in one studied Queensland population. An exceptionally large nest recorded in Victoria contained 661 spiders. Such extreme colony sizes should not be considered typical.
Why Do Foliage Webbing Spiders Live Together?
Most spiders eventually disperse from their birthplace and establish their own hunting areas. Young foliage webbing spiders delay this separation.
After emerging from their egg sacs, the spiderlings remain in the maternal nest and interact with their siblings. During this period, groups of juveniles have been observed participating in several shared activities:
- Constructing and maintaining silk nest structures.
- Removing debris and maintaining living spaces.
- Capturing prey within the communal web.
- Feeding in groups on captured arthropods.
This behavior is often described as subsocial or periodically social because the group-living stage is temporary.
Researchers have suggested that chemical signals, including pheromones, may contribute to tolerance among young siblings. The exact mechanisms behind this behavior remain an area of biological interest.
As the spiders approach maturity, the social arrangement changes. Individuals gradually leave the shared nest and begin independent lives.
What Do Foliage Webbing Spiders Eat?
Foliage webbing spiders are predators of insects and other small arthropods. Their silk nests function as hunting structures that intercept animals moving through nearby vegetation.
When prey becomes entangled in the outer capture silk, spiders can approach it and begin feeding. Juveniles may participate in shared prey capture and feeding.
Their predatory activity can help reduce local populations of some insects. However, the ecological effects of a large colony are not entirely beneficial in every setting.
Dense webbing can also provide protected spaces for other arthropods. In orchards, for example, insects such as thrips may shelter within the silk structure, making them harder to reach with pesticide applications.
Life Cycle and Reproduction
The foliage webbing spider has an unusual life cycle in which solitary reproduction is followed by a prolonged period of communal juvenile development.
Solitary nest establishment
Females that have dispersed from communal nests construct smaller webs among foliage. These early nests include silk sheets and enclosed retreats.
Egg production
After mating, a female may produce a series of flattened, lens-shaped egg sacs over several months. Australian Museum accounts report females producing up to 16 egg sacs, with approximately 10–40 eggs in each sac.
These figures describe documented reproductive capacity rather than a fixed number produced by every female.
Communal juvenile development
Instead of dispersing soon after hatching, the spiderlings remain together and occupy an increasingly elaborate shared nest.
During this period, they develop through successive juvenile stages while sharing the silk structure with their siblings.
Dispersal toward adulthood
In studied Australian populations, dispersal occurs during summer. Females generally leave earlier, often as subadults, while males tend to disperse later and may remain until adulthood.
This difference in dispersal timing may reduce mating between close relatives and help maintain genetic exchange across the population.
Are Foliage Webbing Spiders Dangerous to Humans?
The foliage webbing spider is not recognized as one of Australia’s medically important spiders. It uses venom to subdue arthropod prey, but that does not mean its bite is known to cause serious illness in people.
Reliable species-specific information about human bites is limited. It would therefore be misleading to guarantee that a bite is harmless or to describe precise symptoms without supporting clinical evidence.
These spiders normally occupy foliage nests rather than seeking contact with people. Avoid handling them directly or disturbing a colony unnecessarily.
If a suspected spider bite occurs, gently clean the area and seek medical advice if pain, swelling, or other symptoms develop or persist. A wrapped cold pack may help with discomfort. Severe symptoms or uncertainty about a potentially dangerous Australian spider warrant urgent medical assessment.
Can Foliage Webbing Spiders Damage Plants?
Foliage webbing spiders occupy a complicated position in Australian agricultural ecosystems.
On one hand, they capture insects and contribute to the natural regulation of arthropod populations. On the other, particularly large nests can cover substantial areas of foliage.
Historical reports from Australian orchards describe leaf matting, leaf loss, and damage to small branches associated with heavy webbing infestations.
In some grazing areas, dense silk covering on shrubs has also made foliage less palatable to livestock.
These problems concern extensive colonies and should not be interpreted as evidence that every foliage webbing spider nest damages its host plant.
In a natural garden or bushland setting, an undisturbed colony may be better left in place unless there is a specific management concern.
Foliage Webbing Spider vs. Leaf-Curling Spider
Although both spiders use foliage as part of their shelter, foliage webbing spiders and leaf-curling spiders are not the same.
The foliage webbing spider, Phryganoporus candidus, builds irregular silk nests surrounding leaves and branches. Its young may live together in large communal groups.
The leaf-curling spider, Phonognatha graeffei, is an orb-weaving spider that uses a curled leaf as a protective retreat associated with its orb web.
The distinction is important: a curled leaf inside an orb web is very different from a dense, multi-chambered communal nest extending across vegetation.
Foliage webbing spiders are also related to the black house spider, another member of the family Desidae, but their nesting behavior and typical habitat differ.
Frequently Asked Questions
Do foliage webbing spiders live in groups?
Yes, particularly when young. Juveniles share communal silk nests, sometimes with hundreds of occupants. They generally become solitary after dispersing toward adulthood.
How big is a foliage webbing spider?
Its body is usually approximately 6–10 mm long. The overall span, including the legs, is greater and varies between individuals.
Where are foliage webbing spiders found?
They are widespread across mainland Australia and occur in open forests, woodland, and scrub, where they construct silk nests among vegetation.
What makes their webs unusual?
Their webs combine enclosed living chambers, connecting passages, and external prey-capture layers. Growing juvenile colonies can produce large silk nests around shrubs and branches.
Are foliage webbing spiders poisonous?
They are venomous predators, not poisonous animals in the usual biological sense. The species is not recognized as a major medical threat to humans, although detailed clinical information about its bites is limited.
Should I remove a foliage webbing spider nest?
Not necessarily. Spiders help control insects, and many nests do not create a problem. Extensive webbing affecting valuable plants may justify careful assessment, but routine destruction of colonies is generally unnecessary.
Final Thoughts
The foliage webbing spider is a compelling example of how diverse spider behavior can be. Its intricate silk architecture, communal juvenile development, and eventual return to solitary life set it apart from many familiar web-building species.
Rather than viewing a large web-covered shrub simply as an infestation, it is worth remembering that the structure may support an entire temporary colony of small predators, each approaching a different stage of life.
Observing these spiders without disturbing their nests offers a valuable opportunity to appreciate one of Australia’s more unusual arachnids.
References and Further Reading
- Australian Museum. Foliage Webbing Spider: Phryganoporus candidus. Species profile by Dr Mike Gray, updated 2024.
- Gray, M. R. (2002). The Taxonomy and Distribution of the Spider Genus Phryganoporus Simon (Araneae: Amaurobioidea: Desidae). Records of the Australian Museum, 54, 275–292.
- Australian Museum. Spider Bites and Venoms. Educational reference on spider venom and first aid.
