Idiosoma rhaphiduca is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia. It was described in 1918 by Australian arachnologists William Joseph Rainbow and Robert Henry Pulleine.[1]
The species occurs in south-west Western Australia in open forest habitats, from the valleys of the Darling Scarp southwards to Bunbury and south-eastwards to Albany. The type locality is Kings Park in Perth.[1]
The spiders are fossorial, terrestrial predators. They construct burrows with trapdoors in wet creek banks, the flood flats of watercourses and on patches of open ground in clay soils.[1]