There are no additional races. This is just Aric's Mod 0.9.7 with expanded hybrid content and some gameplay tweaks. Try looking in the library (I think 4th tab from the left on the bottom when you're in the mansion; click on Browse Documents and there are some new entries on breeding). If the new entries are there, you're playing Ralph's version. Also, you can click on the underlined race of whatever slave when you're in Inspect Looks or seeing their description at the slave guild and it will list Breeding Notes after the usual description. If you want the subspecies, you have to get lucky and find one, or more often, you have to breed them yourself.