Serb Jeanne M, Buhay Jennifer E, Lydeard Charles
Department of Biological Sciences, Biodiversity and Systematics, University of Alabama, Box 870345, Tuscaloosa, AL 35487-0345, USA.
Mol Phylogenet Evol. 2003 Jul;28(1):1-11. doi: 10.1016/s1055-7903(03)00026-5.
A molecular phylogeny of the bivalve genus Quadrula (Unionidae) was constructed based on nucleotide sequences of the mitochondrial ND1 gene. Phylogenetic analysis of 66 specimens representing 17 of the 20 currently recognized taxa within Quadrula, three closely allied species, and 16 outgroup taxa reveals a non-monophyletic Quadrula due to the placement of Tritogonia verrucosa, 'Fusconaia' succissa, and 'Quincuncina' infucata. We suggest that the taxonomic description of the genus Quadrula be expanded to include these species. Within the genus, we continue to recognize three monophyletic species groups (the quadrula, metanvera, and pustulosa species groups), as historically described; however, the pustulosa species group must include 'F.' succissa and 'Quincuncina' infucata. Finally, while our findings place the monotypic genus Tritogonia within Quadrula, its relationship to members within the genus Quadrula remains unresolved.
基于线粒体ND1基因的核苷酸序列构建了双壳贝类Quadrula属（蚌科）的分子系统发育树。对代表Quadrula属目前公认的20个分类单元中的17个、3个近缘物种和16个外类群分类单元的66个标本进行系统发育分析，结果显示由于疣边三角蚌、“Fusconaia” succissa和“Quincuncina” infucata的位置，Quadrula属并非单系类群。我们建议扩大Quadrula属的分类描述以包括这些物种。在该属内，我们继续认可历史上描述的三个单系物种组（quadrula、metanvera和pustulosa物种组）；然而，pustulosa物种组必须包括“F.” succissa和“Quincuncina” infucata。最后，虽然我们的研究结果将单型属三角蚌属置于Quadrula属内，但其与Quadrula属内成员的关系仍未解决。
