White Porch Spider Identification in Australia

About the White porch spider

The white porch spider, Cryptachaea gigantipes, is a native Australian comb-footed spider of rocky overhangs, caves and sheltered buildings. Its pale body, exceptionally long front legs and open gum-foot web are useful field clues, but a small household tangle web should still be compared with redbacks, cupboard spiders, common house spiders and the close C. veruculata.

How to identify Cryptachaea gigantipes

Start with the combination of body proportions, colour, front legs and web. This is a small theridiid: the Australian Museum gives body lengths of about 4.7–7.0 mm for males and 4.5–7.9 mm for females, with the long legs excluded. The body is usually pale cream, white, amber, yellowish or greyish with variable darker marks; a male is often more strongly marked than a female. The standout character is the first pair of legs. They are extremely long and fine, and in a male each long section between the joints can exceed the total body length. In a female, each corresponding section is approximately as long as the body. The spider may hold these legs along the substrate or web frame, making it look even longer. The front body is small compared with the abdomen, as in other comb-footed spiders. A confident species call still needs a clear whole-spider view because pale Parasteatoda, Steatoda, Nesticodes and Cryptachaea veruculata can overlap in ordinary photographs. The accepted name is Cryptachaea gigantipes; the older combination Theridion gigantipes is taxonomic history, not a second Australian species.

Clues that are not enough on their own

• A pale or white body alone, because flash, moult stage and related theridiids change colour
• A very long leg span measured from a distorted close photograph rather than a body-length view
• A web on a porch or window, because several comb-footed spiders use the same structures
• A visible egg sac without the adult spider and its leg proportions
• The absence of a red mark used to rule out a redback or prove C. gigantipes

Colour, sex and life-stage variation

Sex, maturity, feeding and lighting change the appearance. Females are usually more robust through the abdomen and can look almost translucent or plain cream when the light comes from behind. Males are smaller in body but often have stronger dark markings and very conspicuous long first legs; a male may be found travelling on silk near a female rather than sitting in the centre of the web. Juveniles are smaller, paler and less predictable in pattern, and their leg proportions can look exaggerated in a close phone image. A gravid or well-fed female has a fuller abdomen, while a recently moulted spider may be soft-looking and washed out. Flash can erase subtle cream tones or turn amber markings white. Do not transfer a measurement from one sex to the other, and do not use a long leg span as body length. The white porch name describes a useful field impression, not a requirement that every adult be bright white or live on a literal porch.

Behaviour, web and retreat

Cryptachaea gigantipes builds a three-dimensional tangle web with sticky gum-foot lines. Unlike a redback’s usually dense secluded retreat, the resting area is often open and visible under an eave, overhang, verandah or window frame, although the spider can press close to bark, stone or painted substrate and disappear against it. The web intercepts insects and other arthropods. Documented prey includes flies, beetles, bugs, moths, caterpillars and other spiders, including black house spiders, wolf spiders and white-tailed spiders. Adult males move along silk in search of females and may guard or remain near an immature female’s retreat. Egg sacs are brownish silk and may contain up to about 250 eggs; they hang in the web near the female’s resting place. Spiderlings can remain together in the maternal web for a period, then disperse rapidly as later egg sacs hatch. Adults occur year-round but are more noticeable in warmer months. A quiet web under cover is therefore normal biology, not evidence that the spider is aggressive or unusually dangerous.

Australian distribution

Australian Museum records the species from the south-eastern corner of Queensland south through eastern Australia to Victoria and across Tasmania. Natural sites include sandstone overhangs, rock crevices and cave entrances, while eaves, porches, verandas and other buildings provide the same shelter and a concentration of flying insects around lights. Norfolk Island records and an introduced New Zealand population are part of the wider biological story, but they should not be used to expand an Australian state filter for a photograph. The exact Atlas of Living Australia page currently shows no aggregate occurrence records, so that display is not evidence that the spider is absent. This profile keeps Queensland, New South Wales, Victoria and Tasmania as conservative search filters and does not infer the ACT, South Australia or the Northern Territory from a broad “eastern Australia” description. Human transport may blur the boundary around buildings; locality is useful context, not a species diagnosis. Preserve the date, broad locality, substrate and whether the web was natural rock or a building.

What to do if you find one

A white porch spider can usually be left where it is. It catches insects and normally stays in a web or on the nearby substrate rather than seeking people. For a useful record, photograph the entire web and support first, then take a dorsal view showing the abdomen and a side or oblique view showing how far the first legs project. Put a ruler or familiar object beside the web, never against the spider, and avoid touching the silk to make it move. If an indoor web is in a high-contact location, keep hands away from the spider and use a wide container, card or long-handled tool only when you can see the animal clearly; professional pest or wildlife help is sensible if a redback or another medically important spider cannot be excluded. Do not pull apart an egg-sac web. For a suspected bite, wash the site and use a wrapped cold pack for pain or swelling. Healthdirect advises medical help for severe or persistent symptoms, breathing difficulty, collapse, a significant allergic reaction or uncertainty about the spider. Call 000 and follow pressure-immobilisation guidance if a funnel-web, mouse spider or unidentified large black spider could be involved.

Compare with similar spiders

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

• Redback spider — Common house spider - Parasteatoda tepidariorum is often darker and more strongly mottled, with a high abdomen and banded legs, and has a loose household tangle web. Its ordinary form can overlap with a pale white porch spider, so the exceptionally long first legs and open eave setting matter.
• Brown house spider / cupboard spider — Diamond comb-footed spider - Cryptachaea veruculata is a close Australian relative with a smaller, more patterned body and shorter-looking front legs. It was historically mixed with other names in the same group; a tiny blurred theridiid should not be forced to species.
• Cape tangle-web spider — Brown house or cupboard spider - Steatoda species tend to look darker, smoother and glossier, often with a more substantial rounded abdomen and a sheltered tangle web. Do not handle a dark spider to inspect it because a redback or another medically important lookalike may be present.
• Red house spider — Redback spider - Latrodectus hasselti is usually darker and may show a red or orange dorsal stripe or ventral hourglass, but juveniles and poor photographs vary. A missing stripe is not a safe exclusion; compare the whole body and web from a distance.

Sources for this profile

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

• Australian Faunal Directory: Cryptachaea gigantipes
• Atlas of Living Australia: Cryptachaea gigantipes
• World Spider Catalog: Cryptachaea gigantipes
• Australian Museum: White Porch Spider
• Zootaxa: Cryptachaea gigantipes redescription
• Lucid Central: Cryptachaea gigantipes
• Museum of New Zealand Te Papa Tongarewa: White porch spider
• healthdirect: Spider bites

Profile review

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