The Giant African Millipede Is a Master of Nutrient Recycling and Chemical Defense

Nature · Published 3 October 2026 Swipe more like this →

In short: Growing up to 33.5 centimetres long, the giant African millipede is the world's largest extant millipede. Beyond its impressive size, this docile creature serves as a vital decomposer in tropical ecosystems, utilizing a unique gut microbiota to break down plant matter and return essential nutrients to the forest floor.

Archispirostreptus gigas, also known as the shongololo, thrives in the lowland forests of East Africa, ranging from Mozambique to Kenya, and is native to Southern Arabia. These creatures are remarkably adapted to low-oxygen environments, such as dense leaf litter and rotting logs, where they remain active. Their role as decomposers is critical for forest floor health, as they facilitate carbon cycling and nutrient recycling. Recent research highlights that their gut microbiota performs methanogenesis, which significantly aids in the breakdown of decaying plant material.

Physically, these millipedes are defined by their size and their numerous legs, which average around 256. Because they molt throughout their lives, the exact number of legs can vary between individuals. They rely on hemocyanin, a copper-based protein, for oxygen transport. Their life expectancy typically spans 7 to 10 years. Interestingly, they maintain a symbiotic relationship with small mites that crawl over their exoskeletons, cleaning the surface in exchange for food and protection from their host.

When threatened, A. gigas employs two primary defense mechanisms: curling into a tight spiral to protect its soft underside with a hard exoskeleton, or secreting an irritating chemical liquid. This secretion, which contains toluquinone and 2-methoxy-3-methylbenzoquinone, is potent enough to deter even driver ants, which are otherwise formidable predators. While they are sometimes kept as pets due to their docile nature, importing them into the United States requires specific federal permits. Their ability to survive in diverse habitats, from forests to coastal areas with minimal tree cover, underscores their resilience as a key species in tropical nutrient-cycling zones.

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