Philoponella congregabilis

Hackled Orb-Weaver Spider Identification in Australia

Small humped Australian hackled orb-weaver often found in communal, messy-looking webs around foliage, shrubs and sheltered house edges.

Usually low risk

About the Hackled orb-weaver

Hackled orb-weavers in the Philoponella group are small Australian web-building spiders that can be overlooked until several appear together in a shared web mass. Philoponella congregabilis is useful to compare when a tiny brown, grey or pale-patterned spider rests in a messy-looking colony of fine silk with a small orb section rather than roaming on the ground.

Exact-species hero photograph: Philoponella congregabilis by Claudia Schipp, CC0 via Wikimedia Commons.

How to recognise a possible Hackled orb-weaver

Begin with the web and family before trusting the common name. The World Spider Catalog accepts Philoponella congregabilis (Rainbow, 1916) in the venomless spider family Uloboridae; the older combination Uloborus congregabilis still appears in historical material. In a useful field view, a very small spider has a humped outline and rests with its front legs folded beneath the body in a fine, often horizontal or sloping web. Australian Museum guidance notes that the rear eye row curves backwards at the ends and is well separated from the front row, while a female’s bowed calamistrum may show in a hand lens or safe macro photograph. Those clues support Philoponella, not automatically this species. The communal web, locality and an exact licensed image can strengthen a route, but specialist examination is still needed when a photo must separate congregabilis from other humped species.

Clues that are not enough on their own

A humped brown or grey body treated as proof of Philoponella congregabilis
A communal web assumed to contain only one species
A colony size or web diameter used as a fixed species character
A small orb section treated as evidence of a complete, undamaged orb web
A grey or pointed egg sac assigned to this species without the female
Folded front legs or the appearance of debris used alone
A Queensland, NSW, Victorian, Tasmanian or ACT sighting treated as a confirmed species record
The old Uloborus congregabilis label treated as a different living species
A similar online image or CC0 photograph copied across Philoponella species

Colour, sex and life-stage variation

The “little humped” form is not a fixed colour chart. Individuals may be brown, grey, cream, orange-brown or dark, with pale mottling that disappears against silk and debris. Females are larger than males in many small orb-weavers, and juveniles may remain in the colony before dispersing or adding a new web section. A communal colony can contain many tiny spiders at different stages, making body size a poor species clue. The long, tapered egg sac of P. congregabilis is described as grey or brown, roughly 9 mm and pointed or spiky at the sides, but an egg sac without the resident female is not a diagnosis. Rain, damage, moult, camera exposure and the angle of the web can all change the apparent hump and pattern.

Behaviour, web and retreat

Philoponella congregabilis is a communal hackled orb-weaver. Its colonies join many small webs with connecting lines, often producing a layered, messy mass in low shrubs, foliage, eaves, sheds or window edges; seasonal colonies can become conspicuous while each spider remains well camouflaged as detritus. The orb section may be horizontal or sloping, heavily modified or pushed aside as a fresh web is added. Cribellate silk is combed into a fuzzy capture surface that snags spiny insect legs. Without venom glands, uloborids subdue prey by wrapping and crushing rather than injecting venom. Communal spiders may defend their local web area by shaking or retreating. Do not shake a colony, remove its debris or assume every spider in a connected web is the same species.

Australian distribution

The World Spider Catalog lists Philoponella congregabilis as Australia, introduced to New Zealand. The Australian Faunal Directory and Atlas of Living Australia retain the accepted name and show substantial Australian occurrence records, while the 2020 redescription documents its recent Christchurch presence. The local quick filters retain Queensland, New South Wales, Victoria, Tasmania and the ACT as broad discovery prompts from the project inventory; they do not prove a species identification in any one suburb. Hackled orb-weavers as a family occur across all Australian states and territories, but that wider family distribution must not be copied onto this species page. Record a broad region, web structure and habitat, not a precise colony address. Outside the expected Australian context, stop at Philoponella sp. unless an expert supports the identification.

What to do if you find one

Observe the colony without touching the silk. Wear closed shoes around shrubs, sheds, verandahs and stored garden items; keep children and pets away from a dense web and do not brush it onto skin. A safe photograph should include the whole web mass, several spiders, the support plant or building edge and a scale object held away from the colony. Do not poke an egg sac, collect a spider by hand or destroy a colony to expose a hidden orb. If the web is indoors or in a difficult location, use a professional removal option. Uloborids lack venom glands and are not considered medically important, but any unexpected bite-like event should be washed and monitored. Seek medical advice for significant or persistent symptoms, and call 000 for collapse, breathing difficulty or anaphylaxis rather than delaying first aid to name a tiny spider.

Compare with similar spiders

Use body shape, web or retreat, location and behaviour together before settling on a likely match.

Panther hackled orb weaver — Panther hackled orb-weaver - Philoponella pantherina is another humped species and the current WSC filter is New South Wales; a fine web or humped outline does not separate it from the communal species.
Garden orb weaver — Dewdrop spider - Argyrodes is a tiny Theridiidae kleptoparasite that lives in or near a larger host web; a silver glint and the host context point in a different direction from a colony-building Philoponella.
Dewdrop spider — Ninja-star ceiling spider - Zosis geniculatus can occupy sheltered house webs and has a distinctive abdominal outline, but a ceiling location is not enough to identify either species.
Long-jawed orb weaver — Miagrammopes line spider - its slender body and four eyes can mimic a twig or thread. A stretched spider on one line is not the humped, eight-eyed Philoponella route.

Sources for this profile

These accessible authoritative sources support the identification and bite-safety context on this page.

Profile review

Published by Spider Identifier Australia. Last factual review: 13 August 2026.

Quick identification

Very small humped orb-weaver, often only a few millimetres long
Brown, grey or pale mottled camouflage that can look like tiny debris in the web
Often found in communal or connected web masses on shrubs, foliage, sheltered walls or house edges
Fine hackled silk may look messy overall even though small orb sections or decorated silk flecks are present

What to check next

Check for tiny size, a humped body and several small spiders in connected fine silk. Compare with dewdrop spiders, silver orb-weavers and tiny house cobweb spiders if the web shape or body detail is unclear.

When to seek medical help

This spider is not usually considered dangerous. Avoid handling it and seek medical advice for severe pain, allergic symptoms, infection signs, spreading symptoms or uncertainty after any bite.

Where it is usually seen

Shrubs, foliage, garden plants, sheltered house edges, hollow trees, rock overhangs and other protected web sites in eastern and south-eastern Australia.

Still not sure?

Compare this spider with more clues

Spider lookalikes can be close. Compare size, web, hiding place and state before handling anything.

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