Description
Original diagnosis after Kent & Ward, 2018 [26544]: The holotype (CMM-V-385; Figure 2.A1A,B) is an upper anterior (A3?) tooth. The crown is broad and compressed, with cutting edges that are coarsely serrated. The serrations are irregular in size on the basal portions of the crown, becoming somewhat finer and more regular apically. The mesial cutting edge is convex, whereas the distal edge is markedly concave. The lingual coronal face is relatively flat, whereas the labial face is weakly convex. The root is compressed with substantially shortened and relatively deep root lobes that do not extend beyond the lateral shoulders of the crown. The basal root margin is strongly arched.
Anterior teeth closer to the jaw symphysis (Figure 2.A1C,D) are less strongly arched distally than the holotype and have somewhat broader crowns. The root lobes on these teeth may extend slightly beyond the lateral margins of the crown. Upper lateral teeth (Figure 2.A1E,F) are more triangular, with the height and width being nearly identical. The mesial cutting edge is less convex than in anterior teeth and may become weakly sigmoidal in some specimens. The distal edge is only weakly concave. The root is compressed, with a broadly arched to slightly obtuse basal margin. The root is typically slightly broader than the base of the crown.
Lower lateral teeth (Figure 2.A1G,H) have crowns weakly inclined distally and a strongly arched basal root margin. The root is slightly thicker than in upper lateral teeth, although this character is somewhat variable.
Lateral teeth located nearer the commissure have crowns that become lower and more distally arched. In some cases the coronal apex is positioned distal to the distal margin of the root. The distal cutting edge becomes progressively more strongly concave, and the basal root margin becomes more weakly arched.

Remarks
shark-references Species-ID=17582;

valid after Tanaka & Kohno (2025) p. 72 [34351]

References