Genome data on the extinct Bison schoetensacki establish it as a sister species of the extant European bison (Bison bonasus).
Palacio P, Berthonaud V, Guérin C, Lambourdière J, Maksud F, Philippe M, Plaire D, Stafford T, Marsolier-Kergoat MC, Elalouf JM. BMC Evol Biol. 2017 Feb 10; 17(1):48. Epub 2017 Feb 10.