Although in certain species the eyes may be reduced to certain extent, they still always possess cornea, unlike in Neobirsteiniamysis.

[1] Boreomysis is one of the most difficult mysid genera, mostly due to considerable variation with age.

[3] The species of Boreomysis are distributed among two subgenera: The nominate subgenus combines most of the species of Boreomysis sensu lato, found in epi-bathypelagic waters, which have pointed rostrum and large ventrolateral projections of the carapace.

[1] Subgenus Petryashovia, with the type species Boreomysis megalops G. O. Sars, 1872, includes epi-mesopelagic species with somewhat less developed carapace projections (no rostrum and rather short ventrolateral lobes) and undevided propodus of pereopods.

[1] Members of the genus are found in all oceans, and Boreomysis can be considered cosmopolitan.