Abstract
Colpomenia sinuosa plays an important role in marine ecosystem and biological resource utilization. The total length of mitochondrion genome was 39,055 bp in length and consists of a circular DNA molecule. The circular genome is composed of 66 genes, including 38 protein coding genes, 25 tRNA genes, and 3 rRNA genes.The total content of G + C is 32.01%, lower than that of A + T. Phylogenetic analysis confirmed the position of C. sinuosa within Pleurocladia lacustris, which offer valuable insights into the phylogeny and gene functions within the family Stramenopiles and promote novel references for the genetic and phylogenetic research of C. sinuosa through the provision of these data.