Cladogram after Barasoain et al. 2022:[2]Boreostemma Glyptotherium Glyptodon Propalaehoplophorus Eucinepeltus Cochlops Palaehoplophorus Kelenkura Eosclerocalyptus Plohophorus Pseudohoplophorus Doedicurus Eleutherocercus Neosclerocalyptus Hoplophorus Propanochthus Panochthus Four species have been described in the genus Boreostemma.

[3] Unspecified Boreostemma fossils were found in the Ipururo Formation of the department of Ucayali, Amazonian Peru.

[7][8] The type species B. pliocena was described in 2008 by Carlini et al. based on 30 osteoderms palate fragment with M6-7 alveoli.

[9] Fossils have been described from the type locality along the road to Tío Gregorio in the Codore Formation at the Lagerstätte of Urumaco.

[21] Fossils have been uncovered from the Santa Inés Formation along the banks of the Güere River in the state of Anzoátegui in Venezuela.