Desis species
Intertidal Marine Spider Identification Australia
Unusual coastal spider that lives among intertidal rocks and reefs, sealing itself inside a silk air chamber when the tide covers its retreat.
Not known as medically significantAustralian intertidal spiders in the genus Desis live where very few people expect spiders: around rocky shores and reefs. Their marine lifestyle is the strongest clue. They shelter in air-filled silk chambers in crevices, shells or seaweed holdfasts while submerged, then emerge around low tide to hunt small shore animals.
Quick identification
- Found in the rocky intertidal zone or on a reef
- Shelters in crevices, shells or seaweed holdfasts
- Silk retreat traps an air pocket when submerged
- May emerge at low tide to hunt small crustaceans
What to check next
Prioritise the precise shore habitat over body colour. Photograph without turning occupied rocks or damaging the silk chamber, and avoid assigning a species from a general photo.
When to seek medical help
These spiders are not known as medically significant. Avoid handling wildlife; seek medical advice for severe or unusual symptoms after any bite.
Where it is usually seen
Rocky shores, reefs, crevices, empty shells and seaweed holdfasts in the intertidal zone around parts of the Australian coast.