Portuguese Millipede

Fascinating facts about the Portuguese Millipede

• When autumn rains break the summer drought, Portuguese millipedes covering up to 50 metres in a single day. Their activity spikes in a narrow climate window: temperatures of 17 to 21 °C and humidity hovering around 95 %. Under hotter conditions, around 27 °C, they shut down.
• A single Portuguese millipede can lay a clutch of 60-80 eggs in a shallow 1-2 cm soil chamber, then spend three years grinding through up to 16 moulting stages before reaching adulthood. By the tenth or eleventh stage most are mature, and adults grow to 20-45 mm long, the size of a small matchstick.
• Since hitching a ride on 20th-century ships, the Portuguese millipede appears on Atlantic islands, South Africa, Australia and New Zealand. It first arrived in South Australia around 1953, likely in ballast water, and has since spread to Victoria, Tasmania, the ACT, New South Wales and Western Australia. Its ability to survive long, dry summers in a quiescent state lets it endure months at sea, turning global trade routes into highways for this invasive detritivore.
• In its native Iberian forests the millipede lives at modest densities, about five individuals per square metre in oak litter, but in Australian grasslands those numbers can soar above 40 per square metre. Despite such crowding, it has not displaced native millipedes, instead filling empty detritus niches. This contrast shows how the species can become hyper-abundant when predators are absent, yet coexist peacefully when ecological roles are already occupied.
• When swarms of Portuguese millipedes blanket railway tracks, trains can lose traction; a 2013 minor crash in Clarkson, Western Australia was linked to crushed millipedes on the line. In response, Adelaide's suburban trains now sport brush-like front wheels that sweep the insects away. This engineering tweak highlights how a tiny soil dweller can force costly changes in modern transport infrastructure.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Portuguese Millipede

In the damp, moss-softened crevices of ancient stone walls, the Portuguese Millipede weaves its subtle path, a whispered rustle of innumerable legs as it navigates the hidden topography of its subterranean realm. With each delicate, segmented wave, it propels itself forward, a mesmerizing embodiment of slow, relentless purpose, driven by the primal urges of survival and exploration. As it moves, the millipede leaves behind a trail of faint, glistening threads, a testament to its quiet industry and the mysterious, unseen world it inhabits.

More insects and spiders to discover

Browse Feravox