1School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia. .
2Australian Museum Research Institute, Australian Museum, 1 William Street, Sydney, NSW 2000, Australia, and School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia. .
Zootaxa. 2022 Dec 20;5222(3):285-297. doi: 10.11646/zootaxa.5222.3.6.
The Giant Sydney Crayfish (Euastacus spinifer (Heller, 1865)) was thought to have a wide range in New South Wales, Australia, spanning some 600 km north-south. A recent extensive molecular phylogenetic and population genomic analysis of E. spinifer across its geographical range revealed strong population structure corresponding to several major geographically correlated clades, the southernmost clade being the most genetically divergent and clearly a separate species. This southern clade corresponds to the junior synonym E. clydensis Riek, 1969 and is sister to the clade comprising the remaining populations of E. spinifer and Euastacus vesper. We formally remove E. clydensis from the synonymy of E. spinifer, increasing the recognised number of species of Euastacus to 54. Euastacus clydensis is redescribed based on type and other material, and is distinguished from E. spinifer by differences in abdominal spination and the form of the antennal scaphocerite. Euastacus clydensis has a restricted southern New South Wales range in the Shoalhaven and Jervis Bay-Clyde River catchments, from Moss Vale south to the vicinity of Clyde Mountain; much of the known range of E. clydensis was burnt in the 2019-2020 eastern Australian megafires.
巨型悉尼淡水小龙虾（Euastacus spinifer (Heller, 1865)）曾被认为分布广泛，在澳大利亚新南威尔士州南北跨度约 600 公里。最近对其地理分布范围内的 E. spinifer 进行了广泛的分子系统发育和群体基因组分析，结果显示其种群结构与几个主要的地理相关分支明显相关，最南端的分支是遗传上差异最大的，显然是一个独立的物种。这个南部分支与次级同义词 E. clydensis Riek, 1969 相对应，与包含 E. spinifer 和 Euastacus vesper 的其余种群的分支是姐妹关系。我们正式将 E. clydensis 从 E. spinifer 的同义词中删除，将 Euastacus 的公认物种数量增加到 54 种。Euastacus clydensis 根据模式和其他材料重新描述，并通过腹部刺的差异和触角 scaphocerite 的形式与 E. spinifer 区分开来。Euastacus clydensis 在新南威尔士州南部的肖尔黑文和杰维斯湾-克莱德河流域的范围有限，从莫斯谷南部到克莱德山附近；E. clydensis 的大部分已知分布范围在 2019-2020 年澳大利亚东部大火中被烧毁。
