Abstract
The genus Thaumatocrinus is composed of species displaying 10 undivided arms arising from 10 radials. Thaumatocrinus naresi is also considered to be a 10-arm species, but individuals with 9 arms were also reported. Here, we report the mitochondrial genome of T. naresi with 9 arms collected from the western Pacific. The genome is 16,047 bp in length with a 67.84% AT content. It contains 13 protein-coding genes (PCGs), 2 ribosomal RNA genes, and 22 transfer RNA genes. Phylogenetic analysis shows that T. naresi forms an independent lineage within Comatulida.