The eleven currently recognized species in the genus Stomias form a monophyletic group. Their interrelationships are hypothesized as follows: brevibarbatus and danae are sister taxa, forming the sister group to other members of the genus. S. longibarbatus and pacificus, both formerly placed in Macrostomias, form a sister lineage to the remaining species. S. colubrinus and lampropeltis are sister taxa, as are affinis and nebulosus. S. atriventer, boa and gracilis form a group, with the latter two as sister taxa. The relationships among the colubrinus, affinis and boa lineages remain unresolved, since there is conflicting evidence for two resolutions. Evidence for monophyly of the species is discussed.