Genus Platycephalus in the Indo-West Pacific comprises about 20 species, of which only five are known in the northwest Pacific. In this study, we sequenced and annotated the complete mitogenome of 4 species: Platycephalus indicus, Platycephalus cultellatus, Platycephalus sp., Platycephalus sp. 2, and downloaded two complete mitogenome of Platycephalus from GenBank for comparative mitogenome researches. The complete mitogenomes of the 5 species (Platycephalus indicus, Platycephalus cultellatus, Platycephalus sp., Platycephalus sp. 1, Platycephalus sp. 2.) are 16,560, 16,672, 16,548, 16,552, and 16,544 bp in length respectively. The mitogenomes are similar in organization and structure with usual mitogenomes of fish species, containing 13 protein-coding genes (PCGs), 22 transfer RNA genes, 2 ribosomal RNA genes, and 2 non-coding regions (control region and L-strand replication origin, O_L). The analysis of genetic distances shows that the variations between 5 Platycephalus species are 0.051 ~ 0.160 on mitogenomes, 0.060 ~ 0.185 on PCGs, and 0.024 ~ 0.085 on rRNA genes, supporting the taxonomic validity of Platycephalus sp., Platycephalus sp. 1, Platycephalus sp. 2. Phylogenetic relationships of genus Platycephalus were first carried out based on mitogenome. The results reveal that Platycephalus indicus was split at the basal clade. Platycephalus sp. and Platycephalus sp. 2 were the most closely clustering with Platycephalus sp. 1 and next with Platycephalus cultellatus. The distribution, relationships, and evolution history of Platycephalus were discussed to provide basic information for taxonomy and phylogenetic relationships of genus Platycephalus.

印度洋-西太平洋的鸭嘴兽属包括约 20 种，其中仅 5 种在西北太平洋已知。在这项研究中，我们对 4 个物种的完整有丝分裂基因组进行了测序和注释：Platycephalus indicus、Platycephalus cultellatus、Platycephalus sp.、Platycephalus sp.。2、从GenBank下载两个完整的Platycephalus有丝分裂基因组，用于比较有丝分裂基因组研究。5个物种（Platycephalus indicus、Platycephalus cultellatus、Platycephalus sp.、Platycephalus sp. 1、Platycephalus）的完整有丝分裂基因组sp. 2.) 的长度分别为 16,560、16,672、16,548、16,552 和 16,544 bp。有丝分裂基因组在组织和结构上与鱼类常见的有丝分裂基因组相似，包含 13 个蛋白质编码基因 (PCG)、22 个转移 RNA 基因、2 个核糖体 RNA 基因和 2 个非编码区（控制区和 L 链复制起点） , _OL )。的遗传距离示出了分析该5个之间的变化Platycephalus物种上mitogenomes 0.051〜0.160，0.060〜0.185上的PCG，和0.024〜0.085的rRNA基因，支持的分类学有效性Platycephalus属，Platycephalus藻。1、Platycephalus sp. 2.属的系统发育关系Platycephalus最初是基于有丝分裂基因组进行的。结果表明，Platycephalus indicus在基底进化枝处分裂。侧柏属 和Platycephalus sp。2 与Platycephalus sp 的聚类最紧密。1 和下一个与Platycephalus cultellatus。的分布，关系和演化历史Platycephalus讨论提供分类和属的系统发育关系基本信息Platycephalus。