Minuca minax is a semi-terrestrial crustacean that commonly lives in low salinity, riverine habitats along the shores of the eastern United States. This study reports, for the first time, the complete mitochondrial genome of M. minax. The AT-rich mitochondrial genome of M. minax is 15,937 bp in length and comprised of 13 protein-coding genes (PCGs), 2 ribosomal RNA genes, and 22 transfer RNA genes. A single 737 bp long intergenic space is assumed to be the D-loop. Most of the PCGs and tRNA genes are encoded in the L-strand. The gene order observed in the mitochondrial genome of M. minax is new although almost identical to that reported in confamiliar species. In all other confamiliar species to which M. minax is compared, the positions of the trnQ gene and the trnI gene are switched. K_A/K_S ratios calculated for all mitochondrial PCGs show values of <1, indicating that these PCGs are evolving under purifying selection. A maximum likelihood phylogenetic analysis (concatenated PCGs [n = 13], 15 species) supports the monophyly of the subfamilies Ocypodinae and Gelaminidae. Mitochondrial PCGs have enough phylogenetic information to reveal relationships supporting higher taxonomic levels within this family. The knowledge of a complete mitochondrial genome from the red-jointed brackish-water fiddler crab M. minax contributes to the better understanding of meta-population connectivity and the mechanisms involved in the adaptation of marine organisms to near-limnic conditions.

Minuca minax是一种半陆生甲壳类动物，通常生活在美国东部沿岸的低盐度河流栖息地。这项研究首次报告了M. minax 的完整线粒体基因组。M. minax富含 AT 的线粒体基因组长度为 15,937 bp，由 13 个蛋白质编码基因 (PCG)、2 ​​个核糖体 RNA 基因和 22 个转移 RNA 基因组成。假设一个 737 bp 长的基因间空间是 D 环。大多数 PCG 和 tRNA 基因在 L 链中编码。在M. minax线粒体基因组中观察到的基因顺序是新的，尽管与在熟悉的物种中报道的几乎相同。在所有其他与M. minax相似的物种中比较时，trnQ基因和trnI基因的位置互换。为所有线粒体 PCG 计算的K _A /K _S比值显示 <1，表明这些 PCG 在纯化选择下进化。最大似然系统发育分析（连接 PCG [ n  = 13]，15 个物种）支持亚科 Ocypodinae 和 Gelaminidae 的单系。线粒体 PCG 有足够的系统发育信息来揭示支持该家族中更高分类水平的关系。来自红节咸水招潮蟹M. minax的完整线粒体基因组的知识有助于更好地了解元种群连通性以及海洋生物适应近海条件所涉及的机制。