I recognize the name osiris for the subspecies, thanks for letting me know that neglecta is a synonym
I also have some info to share myself, there have been four subspecies of Dorcas gazelle (Gazella dorcas) imported into the United States, those subspecies are the Saharan dorcas gazelle (Gazella dorcas osiris), Pelzelns gazelle (Gazella dorcas pelzelnii) , Isabelline gazelle (Gazella dorcas isabella), and the Moroccan dorcas gazelle (Gazella dorcas massaesyla), As far as I know San Diego Zoo had 3 out of the 4, San Diego Zoo had Saharan, Pelzelns and Isabelline.
I also know that it is very endangered subspecies.
The largest protected population of this subspecies is located in
Souss-Massa National Park, southwest Morocco.
This subspecies was once widespread from the southern slopes of the Atlas from Morocco to Tunis. Its horns are straight, slightly bent backwards, other subspecies of dorcas gazelle horns are beautifully formed harp type.
Pelzelns gazelle (Gazella dorcas pelzelnii) unoccupied region is nothing more than mountainous Guban in the north of Somalia. As well as Moroccan gazelle and she include the Red Data Book as endangered subspecies. Endangered status.
I hope I did with that information, though a little more help.