Characterization of the complete mitochondrial genome of the green alga <i>Graesiella emersonii</i> GEGS21 (Chlorophyta)

<i>Graesiella emersonii</i> is a green microalga, belonging to the phylum Chlorophyta, with ecological and industrial significance. However, its phylogenetic position and mitogenome structure remain largely unexplored. We analyzed the complete mitogenome of <i>G. emersonii</i> GEGS21. This genome was 35,893 bp in length and contained 43 genes that comprised 13 protein-coding, six ribosomal RNA, and 24 transfer RNA genes. Phylogenetic analysis based on six protein-coding genes placed <i>G. emersonii</i> GEGS21 in a strongly supported clade with <i>Pectinodesmus pectinatus</i>, confirming its affiliation within the order Sphaeropleales. This study will provide valuable insights into the mitogenome architecture of <i>G. emersonii</i>, thereby contributing to further elucidation of green algal phylogeny and organelle genomic evolution.