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Sphaeromimus musicus is a species of chirping giant pill millipedes found on the island of Madagascar. Of the three described Sphaeromimus species, it has the widest distribution being found in both southeastern and southwestern Madagascar. The most exciting feature of S. musicus is its sexual characters. Males have a structure known as a harp which has stridulation ribs and is able to produce sounds. The number of stridulation ribs on the male harp is five, the highest within the genus. Female Sphaeromimus possess a structure known as the washboard which also has stridulation ribs and produces sounds. The number of stridulation ribs on the female S. musicus washboard is six, again being the highest number within the genus. No detailed studies have been conducted on the ecology of S. musicus and other Sphaeromimus species but it is believed that they are detritivores feeding on decaying organic matter in the leaf litter.