Complete mitochondrial genome and phylogenetic analysis of the sea anemone <i>Heteractis doreensis</i> (Quoy &amp; Gaimard, 1833)

The first complete mitochondrial genome of <i>Heteractis doreensis</i> (Quoy & Gaimard, 1833) was sequenced to clarify its mitogenomic features and phylogenetic position. The circular genome is 20,720 bp long with 60.34% A+T content, comprising 13 protein-coding genes, two ribosomal RNA genes, two transfer RNA genes, and one putative open reading frame. Maximum-likelihood phylogenetic analysis of 19 Hexacorallia species revealed that <i>H. doreensis</i> clusters with <i>Stichodactyla haddoni</i> and <i>Heteractis crispa</i> in a strongly supported clade (bootstrap = 96%) within Stichodactylidae. These findings provide valuable molecular insights into the evolution and phylogeography of <i>H. doreensis</i>, supporting future research on its conservation and breeding.