Notosyodon is an extinct genus of non-mammalian therapsids. The holotype PIN 2505/1, consists of a partial skull preserving the orbital, occipital, and basicranial regions.[1] Other remains include PIN 2505/2, a right lower incisor, and PIN 2505/3, a left upper postcanine, found associated with the holotype and PIN 2608/1, the anterior half of a left dentary found on the right bank of the Donguz River, near Dolmatovskii Farm, Sol-Iletsk District, Orenburg Region, Russia.[1]