Phylogenetic relationships and timing of diversification in gonorynchiform fishes inferred using nuclear gene DNA sequences (Teleostei: Ostariophysi)

The Gonorynchiformes are the sister lineage of the species-rich Otophysi and provide important insights into the diversification of ostariophysan fishes. Phylogenies of gonorynchiforms inferred using morphological characters and mtDNA gene sequences provide differing resolutions with regard to the sister lineage of all other gonorynchiforms (Chanos vs. Gonorynchus) and support for monophyly of the two miniaturized lineages Cromeria and Grasseichthys. In this study the phylogeny and divergence times of gonorynchiforms are investigated with DNA sequences sampled from nine nuclear genes and a published morphological character matrix. Bayesian phylogenetic analyses reveal substantial congruence among individual gene trees with inferences from eight genes placing Gonorynchus as the sister lineage to all other gonorynchiforms. Seven gene trees resolve Cromeria and Grasseichthys as a clade, supporting previous inferences using morphological characters. Phylogenies resulting from either concate...

北梭鱼目（Gonorynchiformes）是物种丰富的耳骨总目（Otophysi）的姊妹演化支，可为骨鳔鱼类（ostariophysan fishes）的物种多样化提供重要研究视角。此前基于形态学特征与线粒体DNA（mtDNA）基因序列推导的北梭鱼目系统发育树，在“其余北梭鱼目的姊妹支为遮目鱼属（Chanos）还是鼠𬶮属（Gonorynchus）”这一问题上存在不同的分辨率，且对两个微型演化支克氏鱼属（Cromeria）与格拉瑟鱼属（Grasseichthys）的单系性支持度存在差异。本研究利用9个核基因的DNA序列与已发表的形态学特征矩阵，对北梭鱼目的系统发育关系与分化时间展开探究。贝叶斯系统发育分析显示，各单基因树之间存在显著一致性：其中8个单基因树将鼠𬶮属（Gonorynchus）定为其余北梭鱼目的姊妹演化支；7个单基因树将克氏鱼属与格拉瑟鱼属聚类为单系演化支，这一结果与此前基于形态学特征的推导结果一致。由串联得到的系统发育树……