New surveys from the Bush Blitz and Planetary Biodiversity Inventory programs has revealed a largely unknown biota of plant bugs in Australia. The mirid subfamily Orthotylinae has exploded in Australia, in association with perennial shrubs in arid and semi-arid Australia. This work documents the discovery of a new clade of 18 new species of the plant bug subfamily Orthotylinae. These new species belong to Naranjakotta, gen. nov., which was analysed phylogenetically and found to be monophyletic. The distribution of Naranjakotta and included species are documented, and analysed in reference to the distribution of all other orthotylines across continental Australia. A paralogy-free subtree analysis was conducted based on a recent phytogeographic classification, which resulted in the recognition of eastern and western subclades, with Tasmania and the Eyre Peninsula unresolved. The host plant associations were optimised at generic and ordinal levels to the Naranjakotta phylogeny and an ancestral Lamiales association for Naranjakotta and an ancestral Acacia association for a subclade of Naranjakotta were found. The eighteen new species described in this work are: N. bicolorata, sp. nov., N. chinnocki, sp. nov., N. cryptandraphila, sp. nov., N. dimorpha, sp. nov., N. graphica, sp. nov., N. hakeaphila, sp. nov., N. hibbertiaphila, sp. nov., N. hyalina, sp. nov., N. keraudrenia, sp. nov., N. lochada, sp. nov., N. macfarlanei, sp. nov., N. minor, sp. nov., N. myrtlephila, sp. nov., N. rosa, sp. nov., N. splendida, sp. nov., N. unicolorata, sp. nov., N. wanarra, sp. nov. and N. watheroo, sp. nov. Orthotylus sidnicus (Stål) is transferred to Naranjakotta.