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The ostracod genus <em>Bennelongia</em> De Deckker &amp; McKenzie, 1981 occurs in Australia and New Zealand. We redescribe <em>B. nimala</em> from the Northern Territory and describe six new species from Western Australia belonging to the <em>B. nimala</em> (five species) and <em>B. triangulata</em> sp. nov. (one species) lineages: <em>B. tirigie</em> sp. nov., <em>B. koendersae</em> sp. nov., <em>B. pinderi</em> sp. nov., <em>B. muggon</em> sp. nov., <em>B. shieli</em> sp. nov. and <em>B. triangulata</em> sp. nov. For six of these seven species, we could construct molecular phylogenies and parsimonious networks based on COI sequences. We tested for specific status and for potential cryptic diversity of clades with Birky’s 4 theta rule. The analyses support the existence of these six species and the absence of cryptic species in these lineages. <em>Bennelongia triangulata</em> sp. nov. is a common species in the turbid claypans of the Murchison/ Gascoyne region. <em>Bennelongia nimala</em> itself is thus far known only from the Northern Territory. <em>Bennelongia tirigie</em> sp. nov., <em>B. pinderi</em> sp. nov. and <em>B. muggon</em> sp. nov. occur in the Murchison/ Gascoyne region, whereas <em>B. koendersae</em> sp. nov. and <em>B. shieli</em> sp. nov. are described from the Pilbara. With the six new species described here, the genus <em>Bennelongia</em> now comprises 31 nominal species.