Nursery Web Spider Identification in Australia

About the Nursery web spider

Nursery web spiders are often noticed on vegetation or near water, especially when a female guards a nursery web. Their long legs and active hunting can resemble wolf or fishing spiders, but the silk nursery around eggs or spiderlings is a particularly useful clue. Check the setting and silk structure together rather than treating leg length or brown patterning as a species-level match.

How to identify a nursery-web spider cautiously

Treat this as a family-level water-and-nursery-web guide, not a species page. Australian nursery-web spiders are commonly grouped under Pisauridae in field resources, but the current World Spider Catalog distinguishes the fishing-spider family Dolomedidae from Pisauridae, so a name such as “water spider”, “fishing spider” or “nursery-web spider” should not be treated as interchangeable proof of one taxon. A useful photograph shows a long-legged hunter, the eye arrangement, body pattern, the plant or water edge, and any egg sac or nursery silk. Some Australian species wait on pond margins or floating vegetation; others hunt away from water and may build sheet webs or use foliage. A female may carry an egg sac in her chelicerae on a silk safety line and later guard a loose nursery web around emerging spiderlings. These are family-level clues. They do not prove a genus or species from a brown spider on a leaf.

Clues that are not enough on their own

• Any long-legged brown spider near water, because Dolomedidae, Pisauridae, wolf spiders and huntsmans overlap
• An egg sac alone, because several spider families carry or guard eggs in silk
• A nursery web assumed to be built by every Australian Pisauridae species
• A spider standing on water without a whole-body view and current taxonomic context
• A large leg span used instead of measured body length
• Brown, grey or striped colour alone, because Australian water spiders are variable
• A garden pond used to assign a species without genus-level characters
• An older “Pisauridae” label copied forward despite current Dolomedidae separation
• A family or overseas nursery-web photograph substituted for an exact Australian taxon

Colour, sex and life-stage variation

Australian water and nursery-web groups range from small foliage hunters to very large water-edge spiders. Body length can be roughly 5–35 mm, while leg span may exceed 15 cm in the largest forms; measure the body without legs. Females may be larger, swollen with eggs or carrying a sac, while males can be slimmer or similarly sized depending on the genus. Colours include grey, brown, tan, greenish and striped forms, and wet cuticle, flash, moulting and reflections alter the contrast. A female carrying an egg sac is not necessarily the same genus as a female guarding a nursery web. The existing image set for this seeded family profile contains fishing and overseas nursery-web species, not a single exact Australian Pisauridae taxon, so this cycle removes the images rather than presenting a species photograph as a family template. Use locality, habitat, body proportions and several views instead of colour alone.

Behaviour, web and retreat

Nursery-web spiders and their close Australian water-spider relatives are active predators rather than neat orb-web sitters. Aquatic species can stand on the surface with front legs touching the water, detect ripples, scull across ponds or streams and dive when threatened; body hairs can trap an air layer during submergence. Other species hunt on foliage, forest floor, heath, mangrove edges or open ground and may build a sheet web. The nursery web is a temporary silk enclosure in foliage that can protect spiderlings as they emerge and begin dispersing; Australian Museum notes that this behaviour is not documented for every Australian genus. Do not test a spider by placing it on water, touching an egg sac or shaking a nursery web. Record what it was already doing and leave the shelter intact.

Australian distribution

Australian Museum describes water or nursery-web spiders as Australia-wide, with aquatic species near ponds, lakes, slow streams, billabongs and mangroves and other genera in rainforest, heath, open forest or suburban gardens. The 2018 Raven and Hebron review revised the Australian and New Caledonian Pisauridae and described four new genera and 23 new species. The World Spider Catalog now also records a modern separation between Pisauridae and Dolomedidae, so older Australian material may use Pisauridae more broadly than current catalogues do. The state filters remain Australia-wide as discovery prompts for this family-level page, not as a range claim for any one genus. Keep state, exact water or vegetation setting, season and photographs; do not infer species from a broad “near a pond” observation.

What to do if you find one

Watch a nursery-web spider from the bank, path or garden edge and leave any egg sac or silk enclosure undisturbed. Take one whole-body frame, one front or three-quarter frame showing the eyes, one image of the habitat and one of the web or sac if present. Put a ruler or familiar object beside the animal rather than touching it, and do not place a terrestrial spider on water to test its identity. Keep children and pets away from ponds, reeds, rock edges and dense foliage. If an indoor spider must be moved and no bite has occurred, use a wide container and card only when hands can remain clear, then release it into sheltered vegetation. For a suspected bite, wash the area and follow current Australian health advice; seek care for severe pain, spreading symptoms, allergic signs, infection or uncertainty. Photo identification cannot determine medical risk.

Compare with similar spiders

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

• Fishing spider — Fishing spider - many Australian water-edge spiders are now treated under Dolomedidae in current catalogues; compare water-running behaviour, body pattern and taxonomy rather than forcing a Pisauridae label.
• Clever fishing spider — Clever fishing spider - Dolomedes facetus has a dedicated profile for a likely species-level water spider; use it only when adult characters, locality and freshwater behaviour agree.
• Wolf spider — Wolf spider - Lycosidae females carry egg sacs attached to the spinnerets, while pisaurids carry them in the chelicerae on a silk line; a clear photo of the attachment point matters.
• Net-casting spider — Huntsman spider - huntsmans can be long-legged and found on vegetation, but they do not make a nursery web around spiderlings. Keep an uncertain brown hunter at family level.

Sources for this profile

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

• World Spider Catalog: Pisauridae family
• World Spider Catalog: Pisauridae generic list
• Australian Museum: Water spider
• Australian Museum: Classifying spiders
• Queensland Museum: Raven & Hebron 2018 Pisauridae review
• Australian Faunal Directory: Pisauridae
• Atlas of Living Australia: Pisauridae
• Australian checklist: Pisauridae
• Australian Museum: Spider webs
• Australian Museum: spiders overview
• healthdirect: Spider bites

Profile review

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