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Matthews, Emma F.; Abrams, Kym M.; Cooper, Steven J.B.; Huey, Joel A.; Hillyer, Mia J.; Humphreys, William F.; Austin, Andrew D.; Guzik, Michelle T.
Molecular phylogenetics and evolution, January 2020, 2020-01-00, 20200101, Volume: 142Journal Article
Display omitted •The Pilbara, Western Australia, is a biodiversity hotspot for subterranean fauna.•Twenty-four putative new species of Parabathynellidae identified from 32 locations.•New Pilbara species have expanded the known world diversity of this group by 22%. Like other crustacean families, the Parabathynellidae is a poorly studied subterranean and aquatic (stygobiontic) group in Australia, with many regions of available habitat having not yet been surveyed. Here we used a combined approach of molecular species delimitation methods, applied to mitochondrial and nuclear genetic data, to identify putative new species from material obtained from remote subterranean habitats in the Pilbara region of Western Australia. Based on collections from these new localities, we delineated a minimum of eight and up to 24 putative new species using a consensus from a range of molecular delineation methods and additional evidence. When we placed our new putative species into the broader phylogenetic framework of Australian Parabathynellidae, they grouped with two known genera and also within one new and distinct Pilbara-only clade. These new species significantly expand the known diversity of Parabathynellidae in that they represent a 22% increase to the 109 currently recognised species globally. Our investigations showed that sampling at new localities can yield extraordinary levels of new species diversity, with the majority of species showing likely restricted endemic geographical ranges. These findings represent only a small sample from a region comprising less than 2.5% of the Australian continent.
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