 UA 8653 , the holotype , is hypsodont and curved . It is 11 @.@ 2 mm high , of which the crown makes up about 85 % , and the dimensions of its crown are 3 @.@ 4 x 3 @.@ 2 mm . The occlusal ( chewing ) surface is worn flat and contains a V @-@ shaped island of dentine surrounded by enamel . One side of the crown lacks enamel . Between the two arms of the V , at the lingual ( inner ) side of the tooth , is a furrow filled with cementum , which extends all the way through the tooth ; the presence of such a long furrow distinguishes it from Gondwanatherium . The enamel is made up of small , round prisms ( bundles of hydroxyapatite crystals ) that are separated by large , continuous bands of interprismatic matrix ( IPM ; the material between the enamel prisms ) . 
