Hormurus polisorum, also known as the Christmas Island cave scorpion, is a species of troglobitic scorpion in the Hormuridae family. It is endemic to Australia’s Christmas Island in the eastern Indian Ocean. It was first described in 2001; at the time of its discovery, it was the first troglobitic scorpion species recorded for Australia, and the second outside the Americas. The scorpions are rare, blind, obligate cave-dwellers, and are restricted to only a few caves on Christmas Island.

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