Conservation systematics of the shield-backed trapdoor spiders of the nigrum -group (Mygalomorphae, Idiopidae, Idiosoma ): integrative taxonomy reveals a diverse and threatened fauna from south-western Australia

The aganippine shield-backed trapdoor spiders of the monophyletic -group of Ausserer are revised, and 15 new species are described from Western Australia and the Eyre Peninsula of South Australia: Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , Rix & Harvey, , and Rix & Harvey, Two previously described species from south-western Western Australia, Main, 1952 and (O. P.-Cambridge, 1870), are re-illustrated and re-diagnosed, and complementary molecular data for 14 species and seven genes are analysed with Bayesian methods. Members of the -group are of long-standing conservation significance, and is the only spider in Australia to be afforded threatened species status under both State and Commonwealth legislation. Two other species, Rix & Harvey, and Rix & Harvey, , are also formally listed as Endangered under Western Australian State legislation. Here we significantly relimit to include only those populations from the central and central-western Wheatbelt bioregion, and further document the known diversity and conservation status of all known species.