| Summary: | The tube-web spider genus <i>Ariadna</i> Audouin, 1826 has been revised for South Australia and Victoria, revealing a remarkable diversity, particularly centred in the arid north of South Australia. We describe 23 species as new, ten of which are supported by molecular data, where these were available. We recognise two species groups for some of the species based on a combination of genitalic morphology, macrosetae patterns and somatic characters: the <i>clavata</i> species group, which includes <i>Ariadna clavata</i> Marsh, Baehr, Glatz & Framenau, 2018 and <i>A. spinosa</i> <b>sp. nov.</b> from South Australia, and <i>A. otwayensis</i> <b>sp. nov.</b> and <i>A. sinuosa</i> <b>sp. nov.</b> from Victoria, and the <i>formosa</i> species group, including <i>A. formosa</i> <b>sp. nov.</b> and <i>A. umbra</i> <b>sp. nov.</b> from South Australia, and <i>A. tria</i> <b>sp. nov.</b> from Victoria. Seventeen new species could not be placed into these two species groups: <i>A. arenacea</i> <b>sp. nov.</b>, <i>A. bellatula</i> <b>sp. nov.</b>, <i>A. curvata</i> <b>sp. nov.</b>, <i>A. deserta</i> <b>sp. nov.</b>, <i>A. diucrura</i> <b>sp. nov.</b>, <i>A. flavescens</i> <b>sp. nov.</b>, <i>A. inflata</i> sp. nov., <i>A. insula</i> sp. nov., <i>A. pollex</i> sp. nov., <i>A. propria</i> sp. nov., <i>A. rutila</i> sp. nov., <i>Ariadna simplex</i> <b>sp. nov.</b>, <i>A. subplana</i> <b>sp. nov.</b>, <i>A. una</i> <b>sp. nov.</b>, <i>A. ungua</i> sp. nov., <i>A. valida</i> sp. nov. and <i>A. woinarskii</i> <b>sp. nov</b>. We provide updated diagnoses and distributional data for <i>A. clavata</i> and <i>A. tangara</i> Marsh, Baehr, Glatz & Framenau, 2018; however, the holotype of <i>A. burchelli</i> (Hogg, 1900) from Victoria could not be located for this project.
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