 The arched mouth bears inconspicuous furrows at the corners; some sources report that the hyomandibular pores (a series of pores above the corners of the mouth) are enlarged, while others report that they are not.The upper teeth number 29–32 rows and have a narrow, smooth-edged central cusp with very coarse serrations at the base on either side.The lower teeth number 26–29 rows and are narrow and smooth-edged.