Global distribution of species of Polymixia.

Type localities of species are indicated by symbols with an enclosed letter “T”. Polymixia sp. types 1 and 2 were considered by investigators to be unusual and not assigned to species. DNA sample localities for this study are indicated by symbols with bold outlines; see S2 Table for sample details. Global base map as modified by F. Bennet, in the public domain, accessed at https://commons.wikimedia.org/wiki/File:BlankMap-FlatWorld6.svg.