Idiosoma subtristeIdiosoma subtriste is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia. It was described in 1877 by British arachnologist Octavius Pickard-Cambridge.Distribution and habitatThe species occurs in South Australia, in the Mount Lofty and Flinders Ranges, in open scrub and woodland habitats. The type locality is Adelaide.BehaviourThe spiders are fossorial, terrestrial predators.