Despite Diplostomum baeri (Dubois, 1937) being one of the most widely distributed parasites of freshwater fish, there is no complete mitochondrial (mt) genome currently available. The complicated systematics presented by D. baeri has hampered investigations into the species distributions and infective dynamics of the species. Within this study we obtained complete mt genome sequences of D. baeri and assessed its phylogenetic relationship with other species of Digenea. The complete mitochondrial genome of D. baeri is 14,480 bp in length, containing 36 genes in total. The phylogenetic tree resulting from Bayesian inference of concatenated 12 protein coding gene sequences placed D. baeri alongside published mt genomes of Diplostomidae, with the overall taxonomic placement of the genus being a sister lineage of the order Plagiochiida The characterization of further mitochondrial genomes within the family Diplostomidae will help progress phylogenetic and epidemiological investigations as well as providing a framework for the analysis of diagnostic markers to be used in further monitoring of the parasite worldwide.

尽管Diplostomum baeri（Dubois，1937）是淡水鱼中分布最广泛的寄生虫之一，但目前尚无完整的线粒体（mt）基因组。D. baeri提出的复杂的系统阻碍了对物种分布和物种感染动力学的研究。在这项研究中，我们获得了D. baeri的完整mt基因组序列，并评估了其与Digenea其他物种的系统发育关系。D. baeri的完整线粒体基因组长度为14,480 bp，总共包含36个基因。贝叶杆菌串联的12个蛋白质编码基因序列的贝叶斯推论形成的系统进化树。一起发表Diplostomidae的MT基因组，与属是家庭Diplostomidae将有助于进步进化和流行病学调查范围内的进一步线粒体基因组的顺序Plagiochiida表征的妹妹血统以及为分析提供了一个框架的整体分类地位诊断标记将用于进一步监测全世界的寄生虫。