Idiosoma formosum sp. n., male holotype (WAM T139470) from Mount Gibson Station (Western Australia; AVW), somatic morphology. 145–146 Carapace and abdomen, dorsal view 147 Carapace, lateral view 148 Eyes, dorsal view 149 Mouthparts, ventral view 150 Sternum, ventral view 151 Abdomen, posterior view 152 Leg I, prolateral view 153 Leg I tibia, clasping spurs, prolateral view 154 Leg I tibia, proventral view. Scale bars 2.0. SP1–4 = sigilla pairs 1–4.