Idiosoma occidentale is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia. It was described in 1903 by British arachnologist Henry Roughton Hogg.
Distribution and habitat The species occurs in north-west Western Australia. The type locality is Roebourne in the Pilbara region, some 1,560 km north of Perth.
Behaviour The spiders are fossorial, terrestrial predators.
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