F I G U R E 1 A in Phylogenetic placement and description of Ngaliadessus humphreysi gen. et sp. nov., Watts & Villastrigo (Coleoptera: Dytiscidae), a subterranean diving beetle from the Ngalia Basin in central Australia

F I G U R E 1 A geological representation of the Ngalia Basin with subterranean groundwaters and its main sampling sites for stygobiotic taxa, including Sullivans Well. The geology was determined from Australian Geological Survey 1: 250 000 maps SF52-12 Mt Doreen (1995) and Napperby SF53-09 (1982) and information compiled by Edgoose and Ahmad (2013). Inset shows the approximate location of the Ngalia Basin in central Australia.