M18 · Insect
Portuguese Millipede
Ommatoiulus moreletii
Introduced species that invades homes in plague numbers after autumn rains. Crushes into a smelly stain.
- Size
- 20–45 mm
- Habitat
- Mulch, leaf litter, garden beds
- Activity
- Autumn, after rain
Safety Warning
Do NOT crush millipedes on carpet or paint. The defensive fluid stains permanently. Vacuum them up instead.
Overview
Portuguese millipedes were accidentally introduced to Australia and have become a seasonal nightmare in SA, Victoria and WA. After rain in autumn, they migrate in huge numbers, entering homes through the tiniest gaps. When disturbed or crushed they excrete a foul-smelling fluid that stains carpets and skin yellow-brown. They don't bite and are not venomous.
How to identify
- Dark grey or black, cylindrical body with 50+ pairs of legs
- Slow-moving with a wave-like leg motion
- Curl into a tight spiral when disturbed
- Appear in large numbers on walls, paths and doorways after rain
General guidance only. Information on Home Pest Defence is provided for educational purposes and is not a substitute for professional advice. For termites, venomous spider bites, wasp nests in walls, or protected wildlife, contact a licensed pest controller, your GP, or the relevant state wildlife authority. In emergencies call 000; for poisoning call 13 11 26.