Who is the "King" of the bears?

[brotherbear]

I am finding very little mention of Arctotherium bonariense. But, what Little I am finding is interesting. I will have to dig deeper into the world of the short-faced bears.
http://www.biolib.cz/en/taxonposition/id608915/ 

system Vitae - living organisms
domain Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells
superregnum Unikonta
system Opisthokonta Cavalier-Smith, 1987
kingdom Animalia Linnaeus, 1758 - animals
subregnum Eumetazoa Butschli, 1910
divisio Bilateria Hatschek, 1888 - Bilaterians
subdivisio Deuterostomia - deuterostomes
phylum Chordata Bateson, 1885 - chordates
subphylum Vertebrata Cuvier, 1812 - vertebrates
infraphylum Gnathostomata Zittel, 1879 - jawed vertebrates
superclassis Tetrapoda Gaffney, 1979 - four-limbed vertebrates
class Mammalia Linnaeus, 1758 - mammals
subclass Theria Parker & Haswell, 1897
infraclass Eutheria Thomas Henry Huxley, 1880
order Carnivora Bowdich, 1821 - carnivores
suborder Caniformia Kretzoi, 1938 - dog-like
superfamily Ursoidea Fischer de Waldheim, 1817
family Ursidae Fischer von Waldheim, 1817 - bears
subfamily Tremarctinae Merriam & Stock, 1925
genus Arctotherium Bravard, 1857 †
species Arctotherium bonariense (Gervais, 1852) - Buenos Aires Bear † Reply