The complete mitochondrial genome of Neptuneopsis gilchristi GB Sowerby III, 1898 (Neogastropoda: Volutidae: Calliotectinae)

We report the complete mitochondrial genome of Neptuneopsis gilchristi G.B. Sowerby III, 1898, the type species of the monotypic genus Neptuneopsis. This mitogenome is 15,312 bp in length and has a GC content of 31.3%. The gene order of the 13 protein-coding genes, 2 ribosomal RNA genes, and 22 transfer RNA genes, is identical to that of most neogastropods other than of several conoidean taxa, which differ only in the location of one or more tRNA genes. The potential origin of replication is located in a 127 bp non-coding region between tRNA-Phe and COX3 that has a high A + T content (77.9%). Phylogenetic analyses using maximum likelihood and Bayesian inference with nucleotide sequences of all protein coding and ribosomal genes show Neptuneopsis to be sister to the few volutid species for which complete or partial mitogenome data are available. Neptuneopsis gilchristi has an operculum and a triserial radula, while the other volutids in our analyses have lost the operculum and have a derived uniserial radula.