Phylogeography and species delimitation of Cherax destructor (Decapoda: Parastacidae) using genome-wide SNPs

Cherax is a genus of 58 species of decapod crustaceans that are widespread across Australia and New Guinea. We use single-nucleotide polymorphisms (SNPs) to examine phylogeographic patterns in the most widespread species of Cherax, namely, C. destructor, and test the distinctiveness of one undescribed species, two C. destructor subspecies, previously proposed evolutionarily significant units, and management units. Both the phylogenetic analyses and the analysis of fixed allelic differences between populations support the current species-level taxonomy of C. setosus, C. depressus, C. dispar and C. destructor, the distinctiveness of C. destructor albidus and C. d. destructor and the existence of one undescribed species. The two populations of C. d. albidus from the Glenelg and Wimmera rivers were significantly distinct, with eight diagnostic differences (<1% fixed differences, null expectation is four fixed differences), but this low level of divergence is interpreted as within the ran...螯虾属（Cherax）是一个包含58个物种的十足目甲壳动物类群，广泛分布于澳大利亚与新几内亚地区。本研究采用单核苷酸多态性（single-nucleotide polymorphisms, SNPs），对分布最广的螯虾属物种——破坏螯虾（C. destructor）的系统地理格局展开探究，并检验一个未描述物种、两个破坏螯虾亚种、此前提出的进化显著单元以及管理单元的分化独立性。系统发育分析与种群间固定等位基因差异分析均支持如下结论：C. setosus、C. depressus、C. dispar与破坏螯虾（C. destructor）当前的物种级分类地位合理，C. destructor albidus与C. d. destructor的分化独立性得到证实，同时确认了一个未描述物种的存在。采自格伦内尔格河与威默拉河的两个C. d. albidus种群存在显著分化，共存在8个诊断性差异位点（固定差异占比不足1%，零假设预期为4个固定差异），但这种低水平的分化被认为处于