Molecular phylogeny of the subfamily Schizothoracinae (Teleostei: Cypriniformes: Cyprinidae) inferred from complete mitochondrial genomes

The schizothoracine fishes, members of the Teleost order Cypriniformes, are one of the most diverse group of cyprinids in the Qinghai Tibetan Plateau and surrounding regions. However, taxonomy and phylogeny of these species remain unclear. In this study, we determined the complete mitochondrial genome of Schizopygopsis malacanthus. We also used the newly obtained sequence, together with 31 published schizothoracine mitochondrial genomes that represent eight schizothoracine genera and six outgroup taxa to reconstruct the phylogenetic relationships of the subfamily Schizothoracinae by different partitioned maximum likelihood and partitioned Bayesian inference at nucleotide and amino acid levels. The schizothoracine fishes sampled form a strongly supported monophyletic group that is the sister taxon to Barbus barbus. A sister group relationship between the primitive schizothoracine group and the specialized schizothoracine group + the highly specialized schizothoracine group was supported. Moreover, members of the specialized schizothoracine group and the genera Schizothorax, Schizopygopsis, and Gymnocypris were found to be paraphyletic. (C) 2015 Elsevier Ltd. All rights reserved.

裂腹鱼属鱼类是鲤形目鲤科的成员，是青藏高原及周边地区鲤科鱼类中多样性最高的类群之一。然而，这些物种的分类和系统发育关系仍不明确。在本研究中，我们测定了软刺裸裂尻鱼的完整线粒体基因组。我们还利用新获得的序列，以及已发表的代表8个裂腹鱼属和6个外类群的31个裂腹鱼线粒体基因组，在核苷酸和氨基酸水平上通过不同的分区最大似然法和分区贝叶斯推断来重建裂腹鱼亚科的系统发育关系。所研究的裂腹鱼样本形成了一个具有强支持的单系群，是鲃鱼的姊妹分类群。原始裂腹鱼群与特化裂腹鱼群 + 高度特化裂腹鱼群之间的姊妹群关系得到了支持。此外，发现特化裂腹鱼群的成员以及裂腹鱼属、裸裂尻鱼属和裸鲤属是并系的。(C) 2015爱思唯尔有限公司。保留所有权利。