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As it currently stands, the Laurasiatheria superorder holds eight orders and the ungulates are split -- unevenly -- between two of them: the Artiodactyla and Perissodactyla.
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Nonetheless, the current consensus is that the ungulates don’t represent a genetic unit; that is to say that they’re not a group of mammals more closely related to one another than to other (non-ungulate) mammals.
Rather, it seems that the ungulates form an evolutionary grade – in other words, they’re a group whose members have evolved similar adaptations (significantly, although not limited to, hooves in place of claws).
Well, back in 1766, Carl von Linne did indeed group all hoofed mammals under the umbrella (more specifically known as a grandorder) Ungulata, stemming from the Latin unguis, meaning “nail” or “hoof”.
Of late, however, there has been much debate over the validity of Ungulata as a taxonomic clade; as recently as 2004 Andrew Duff and Ann Lawson included the Ungulata as a grandorder in their checklist of mammals of the world.