Any race, regardless of their place of origin and evolutionary history, can still be applied to the already existing classifications within the taxonomic rank if they still exhibit the same characteristics as those found in the rank. For those that don't fit any of the descriptions they're still able to come in under new classifications at any part of the taxonomic rank where they don't fit in any other.
Race can be used interchangeably with species, but also as a descriptor for different groups within the same species, such as a member of the human race who's race is also caucasian. Breed can also be used for the purpose of distinguishing between those of the same species depending on certain circumstances. The English translation is not good for such matters, but there are distinct terms for this in many other languages.
Races can also be classified according to their level of Seynience.