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A Prickly Problem: Genome Skimming Reveals Varying Levels of Phylogenetic Diversity in the Freshwater Crayfish Euastacus armatus Complex (Parastacidae) With Implications for Taxonomy and Conservation.

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Title: A Prickly Problem: Genome Skimming Reveals Varying Levels of Phylogenetic Diversity in the Freshwater Crayfish Euastacus armatus Complex (Parastacidae) With Implications for Taxonomy and Conservation.
Authors: Austin, Christopher M.1,2,3 (AUTHOR), Ahyong, Shane T.4,5 (AUTHOR), Miller, Adam6 (AUTHOR), Raadik, Tarmo A.7 (AUTHOR), Lintermans, Mark8,9 (AUTHOR), McCormack, Rob10 (AUTHOR), Zukowski, Sylvia11 (AUTHOR), Hammer, Michael P.3 (AUTHOR), Grandjean, Frederic12 (AUTHOR), Gilligan, Dean M.13 (AUTHOR), Beitzel, Matt14 (AUTHOR), Whiterod, Nick S.11,15,16 (AUTHOR) nick.whiterod@adelaide.edu.au
Source: Ecology & Evolution (20457758). Apr2026, Vol. 16 Issue 4, p1-14. 14p.
Subject Terms: *Nature conservation, *Species diversity, Taxonomy, Crayfish, Mitochondrial DNA, Phylogeny, Nucleotide sequencing
Geographic Terms: Australia
Abstract: Accurate resolution of species taxonomies and natural distributions is paramount to enable effective conservation and management. But this can be a challenge in systems that lack sufficient genomic resources and systematic research, and when species ranges are dynamic due to population decline, human‐mediated introduction, or responses to climate change. This is particularly true for many of the world's 690 species of freshwater crayfish, including Australia's endemic spiny crayfish from the Euastacus genus. In this study, we use genome skimming to successfully recover whole mitogenomes and nuclear markers to examine the molecular taxonomy, phylogeography and range uncertainty in a wide‐ranging complex, which includes the nationally Vulnerable Murray crayfish Euastacus armatus, the nationally Endangered Glenelg spiny crayfish E. bispinosus and the Southern Victorian spiny crayfish E. yarraensis. The analyses revealed high levels of genetic structure in both E. armatus and E. yarraensis, including sufficiently divergent lineages within E. yarraensis that potentially warrants independent taxonomic recognition. Furthermore, analyses resolved the status of E. armatus populations persisting outside known contemporary ranges as being relictual and of high conservation importance. Whilst one outlying population of E. bispinosus was confirmed as relictual, another was revealed as being translocated. This study demonstrates genome skimming as a powerful technique for generating molecular data to support key elements of conservation for freshwater crayfish and other species. Whole mitogenome and nuclear molecular analyses clarify conservation uncertainty in wide‐ranging freshwater crayfish complex. We reveal high levels of genetic structure and resolves the conservation status of several outlying populations, and divergent lineages that potentially warrants independent taxonomic recognition. This study demonstrates genome skimming as a powerful technique for generating molecular data to support key elements of conservation for freshwater crayfish and other species. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A Prickly Problem: Genome Skimming Reveals Varying Levels of Phylogenetic Diversity in the Freshwater Crayfish Euastacus armatus Complex (Parastacidae) With Implications for Taxonomy and Conservation.
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Apr2026, Vol. 16 Issue 4, p1-14. 14p.
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  Data: *<searchLink fieldCode="DE" term="%22Nature+conservation%22">Nature conservation</searchLink><br />*<searchLink fieldCode="DE" term="%22Species+diversity%22">Species diversity</searchLink><br /><searchLink fieldCode="DE" term="%22Taxonomy%22">Taxonomy</searchLink><br /><searchLink fieldCode="DE" term="%22Crayfish%22">Crayfish</searchLink><br /><searchLink fieldCode="DE" term="%22Mitochondrial+DNA%22">Mitochondrial DNA</searchLink><br /><searchLink fieldCode="DE" term="%22Phylogeny%22">Phylogeny</searchLink><br /><searchLink fieldCode="DE" term="%22Nucleotide+sequencing%22">Nucleotide sequencing</searchLink>
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  Data: Accurate resolution of species taxonomies and natural distributions is paramount to enable effective conservation and management. But this can be a challenge in systems that lack sufficient genomic resources and systematic research, and when species ranges are dynamic due to population decline, human‐mediated introduction, or responses to climate change. This is particularly true for many of the world's 690 species of freshwater crayfish, including Australia's endemic spiny crayfish from the Euastacus genus. In this study, we use genome skimming to successfully recover whole mitogenomes and nuclear markers to examine the molecular taxonomy, phylogeography and range uncertainty in a wide‐ranging complex, which includes the nationally Vulnerable Murray crayfish Euastacus armatus, the nationally Endangered Glenelg spiny crayfish E. bispinosus and the Southern Victorian spiny crayfish E. yarraensis. The analyses revealed high levels of genetic structure in both E. armatus and E. yarraensis, including sufficiently divergent lineages within E. yarraensis that potentially warrants independent taxonomic recognition. Furthermore, analyses resolved the status of E. armatus populations persisting outside known contemporary ranges as being relictual and of high conservation importance. Whilst one outlying population of E. bispinosus was confirmed as relictual, another was revealed as being translocated. This study demonstrates genome skimming as a powerful technique for generating molecular data to support key elements of conservation for freshwater crayfish and other species. Whole mitogenome and nuclear molecular analyses clarify conservation uncertainty in wide‐ranging freshwater crayfish complex. We reveal high levels of genetic structure and resolves the conservation status of several outlying populations, and divergent lineages that potentially warrants independent taxonomic recognition. This study demonstrates genome skimming as a powerful technique for generating molecular data to support key elements of conservation for freshwater crayfish and other species. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/ece3.73428
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      – Code: eng
        Text: English
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        PageCount: 14
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      – SubjectFull: Nature conservation
        Type: general
      – SubjectFull: Species diversity
        Type: general
      – SubjectFull: Taxonomy
        Type: general
      – SubjectFull: Crayfish
        Type: general
      – SubjectFull: Mitochondrial DNA
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      – SubjectFull: Phylogeny
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      – SubjectFull: Nucleotide sequencing
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      – SubjectFull: Australia
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      – TitleFull: A Prickly Problem: Genome Skimming Reveals Varying Levels of Phylogenetic Diversity in the Freshwater Crayfish Euastacus armatus Complex (Parastacidae) With Implications for Taxonomy and Conservation.
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              Text: Apr2026
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