Hunter-Schreger band

Hunter-Schreger bands, commonly abbreviated as HSB, are features of the enamel of the teeth in mammals, mostly placentals.By the late Paleocene, HSB is seen to extend throughout the enamel and the bands are located at nearly right angles to each other.Uniserial HSB, present in most living rodents, consist of a single layer of prisms.Multiserial HSB, three to seven prisms thick, characterize the living Hystricognathi and the gundis (Ctenodactylidae) and springhares (Pedetes).[8] The teeth of Arctodus pristinus transition between undulating to acute-angled Hunter-Schreger bands while Arctodus simus exhibited a transition between undulating to zigzag bands, demonstrating an evolution towards reinforced tooth enamel.
enamelmammalsplacentalsenamel prismsPaleoceneGliresrodentslagomorphsincisorsleporidsEoceneOchotonidsPaleogeneHystricognathigundisspringharesOctodontoideacarnivoranshyenasArctodus pristinusArctodus simustooth enamelagriotheriinHemicyon