Ixamatus caldera, also known as the tessellated wishbone spider[1] or volcanic ground spider,[2] is a species of mygalomorph spider in the Microstigmatidae family. It is endemic to Australia. It was described in 1982 by Australian arachnologist Robert Raven.[3]
The species occurs in north-eastern New South Wales in closed forest habitats. The type locality is Bar Mountain, near Kyogle in the Tweed Range.[3]
The spiders are terrestrial predators.[3]