Rediscovered Illacme plenipes: A 750-Leg Millipede’s Return

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A millipede once thought to vanish from the wild for 84 years has reappeared, offering a rare glimpse into a line of life that has long puzzled scientists. The creature is Illacme plenipes, a name that translates to the acme of plentiful legs, a fitting title for a species that surpasses most of its kin in limb count. In body length it sits at about three centimeters, yet it can bear as many as 750 legs when mature. To put that into perspective, most millipedes max out around a hundred legs. The rediscovery marks a landmark moment for invertebrate science, reminding researchers that the diversity of life still hides surprising details, even in familiar corners of the world. The find also underscores the resilience of life and the enduring curiosity that drives field exploration.

Beyond its leg count, Illacme plenipes carries a suite of unusual adaptations. It is said to spin silk from long hairs along its dorsal surface, weaving a delicate, protective layer around its body. Its antennae are notably long, serving as sensitive feelers that help the millipede sense its surroundings in dim light and tight crevices. The legs lie in close clusters along the body and can function like tiny claws, enabling the animal to cling to rocks as it moves across rough terrain. Some observers describe its exoskeleton as unusually subtle in appearance, almost invisible against the rock and leaf litter. The mouthparts are arranged to access plant tissue, a design that supports a diet rooted in plant material and the microhabitats where these creatures hunt for nourishment. The combination of these features highlights a creature built to thrive in precarious, shaded spaces among stones and soil, where navigation requires a sensitive touch and a careful grip.

Despite the wonder surrounding the sighting, the habitats of Illacme plenipes face increasing pressure from human activity. Development, agriculture, and climate-driven shifts have altered the microhabitats where these millipedes live, narrowing their range and heightening the risk that they could vanish again. Conservationists stress the importance of protecting native habitats, including soil health, leaf litter, and rocky refuges that shelter these creatures. Researchers hope to learn more about their reproductive biology, ecological role, and evolutionary history, information that can inform broader strategies for preserving rare invertebrates. The rediscovery offers a spark for ongoing study and a reminder that safeguarding small, often overlooked species is essential to maintaining the balance of healthy ecosystems.

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