On the phylogenetic positioning of the South American freshwater crayfish genera (Decapoda: Parastacidae)
On the phylogenetic positioning of the South American freshwater crayfish genera (Decapoda: Parastacidae)
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DOI：
10.1651/0278-0372(2000)020
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发表时间：
2000-08-01
影响因子：
1.1
通讯作者：
Buckup, L
中科院分区：
文献类型：
--
作者：
Crandall, KA;Fetzner, JW;Buckup, L
南美洲有三种特有的半腹面淡水小龙虾属（即，Parastacus Huxley，Samastacus Riek和Virilastacus Hobbs），目前共有10个描述的物种。以前的一位作者认为，这些属中的每一个都与澳大利亚的属有着比彼此更密切的亲缘关系。我们从线粒体DNA的16S基因的约500个核苷酸的测序，以估计南美属的淡水小龙虾之间的系统发育关系，并确定其相对于澳大利亚属的系统发育定位。我们采样了来自南美洲的所有三个属的七种19个个体。这些序列与其他澳大拉西亚小龙虾的总代表性的54个序列，涵盖13个属。我们的研究结果表明，南美洲属形成了一个良好的支持单系群密切相关的澳大利亚小龙虾（Paranephrops和Parastacoides）的一个子集。我们的研究结果也为目前公认的通用名称提供了强有力的支持。
South America contains three endemic genera of parastacid freshwater crayfishes (i.e., Parastacus Huxley, Samastacus Riek, and Virilastacus Hobbs), with a current total of ten described species. A previous author has argued that each of these genera has closer affinities with genera from Australia than to each other. We sequenced approximately 500 nucleotides of the 16S gene from mitochondrial DNA to estimate phylogenetic relationships among the South American genera of freshwater crayfishes and determined their phylogenetic positioning relative to the Australian genera. We sampled seven species representing all three genera from South America with 19 individuals. These sequences were combined with other Australasian crayfishes for a total representation of 54 sequences covering 13 genera. Our results indicate that the South American genera form a well-supported monophyletic group closely related to a subset of the Australasian crayfishes (Paranephrops and Parastacoides). Our results also provide strong support for the currently recognized generic designations.