The first complete chloroplast genome of <i>Halodule uninervis</i> (Forssk.) Boiss. 1882 (Cymodoceaceae)

<i>Halodule uninervis</i> (Forssk.) Boiss. 1882 is a seagrass species. The complete chloroplast genome is 164,005 bp in length, with a GC content of 36.3%. This genome consists of a large single-copy region of 87,522 bp, a small single-copy region of 11,481 bp and a pair of inverse repeat regions of 32,501 bp each. A total of 131 genes were annotated in the genome, including 87 protein-coding genes, 36 tRNA genes, and 8 rRNA genes. Phylogenetic analysis revealed that <i>H. uninervis</i> shares the closest taxonomic relationship with <i>Cymodocea rotundata</i> and <i>Syringodium isoetifolium</i>, and all three species belong to the family Cymodoceaceae.