Nineteen new species of Karaops are described: K. durrantorumsp. nov. (♂), K. morganoconnellisp. nov. (♀♂), K. joehaenerisp. nov. (♀), K. dalmanyisp. nov. (♀♂), K. garyodwyerisp. nov. (♂), K. dejongisp. nov. (♀♂), K. malumbusp. nov. (♀♂), K. conilurussp. nov. (♂), K. yumbubaarnjisp. nov. (♀♂), K. markharveyisp. nov. (♀♂), K. nitmiluksp. nov. (♀), K. kennerleyorumsp. nov. (♂), K. jawaywaysp. nov. (♀), K. mparntwesp. nov. (♀), K. larapintasp. nov. (♀), K. kwartatumasp. nov. (♂), K. madhawundusp. nov. (♀), and K. mareebasp. nov. (♀). The male of K. umiida Crews, 2013 was found to be misidentified and is now K. conilurussp. nov.Karaops yindjibarndisyn. nov. is a new synonym of K. nyiyaparli. Selenops australiensis L. Koch, 1875 is considered a nomen dubium because the holotype is an immature male, and the species previously referred to as K. australiensis (L. Koch, 1875) is here described as K. strayamatesp. nov. (♀♂). The males of K. marrayagong Crews & Harvey, 2011 and K. banyjima Crews, 2013 are described for the first time. To manage the growing diversity of the genus, most of the species have been placed in species groups, which are diagnosed. They are the Central Desert group, the strayamate group, the raveni group, the dawara group, the francesae group, the Kimberley group, and the Pilbara-Gascoyne group. New keys are provided to accommodate the new species, and new distribution maps and new records are provided for all species. Diagnoses and descriptions are emended where required. Images of live spiders, many not previously seen alive, and natural history information are also provided.
