 M1 is flat-crowned. The anteroloph, a crest at the front of the tooth, lacks a smaller accessory spur that is present in N. rufus. The paracone, one of the main cusps, is quite small; this cusp is more prominent in N. rufus. The mesoloph, a crest on the middle of the tooth, is distinct but short and located further to the back than in N. rufus. M2 has a longer mesoloph. M3 is largely flat-crowned, but the paracone is a bit more prominent than the rest. The valley between the cusps at the front is deeper than the valleys at the back. Each of the upper molars has three roots.
