| Summary: | The mitochondrial genome (mitogenome) is essential for identifying species and tracing genetic variation, gene patterns, and evolutionary studies. Here, the mitogenome of <i>Grateloupia turuturu</i> was sequenced on the Illumina sequencing platform. This circular mitogenome (28,265 bp) contains 49 genes, including three rRNAs, twenty transfer RNAs (tRNAs), and twenty-six protein-coding genes (PCGs). Nucleotide composition indicates biased AT (68.8%) content. A Group II intronic sequence was identified between two exons of the <i>cox1</i> gene, and this sequence comprises an open reading frame (ORF) that encodes a hypothetical protein. The gene content, annotation, and genetic makeup are identical to those of Halymeniaceae members. The complete mitogenome sequences of the <i>Grateloupia</i> and <i>Polyopes</i> species were used in a phylogenetic analysis, which revealed that these two genera are monophyletic and that <i>G. turuturu</i> and <i>G. elliptica</i> are closely related. This newly constructed mitogenome will help us better understand the general trends in the development of <i>cox1</i> introns in Halymeniaceae, as well as the evolution of red algal mitogenomes within the Rhodophyta and among diverse algal species.
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