@Lota lota Not sounds dumb at all. This book accept and illustrate all the new proposed species from Groves & Grubb, but only for family Bovidae (species list doubled from around 140 to 279) The classification of hoofed mammals received a massive revision back in 2010, but it is still not widely accepted.
Check this thread if you need more info: Ungulate taxonomy revisited: the evidence for the splits of G&G
