Description
Original diagnose after Shimada et al. (2017) p. 706 [24480]: Lamniform differing from all known species of otodontids (sensu this paper; see Discussion) by the following combination of characters: tooth consisting of a sharply-pointed, relatively tall, triangular main cusp, one prominent pair of triangular lateral cusplets, and strongly bilobed root; main cusp erect, slightly inclined distally, or gently curved distally; lingual crown face very convex without ornamentation; labial crown face flat or subtly convex except center of base with weak depression; height and width of each lateral cusplet nearly equal with tendency to point outward; both mesial and distal cutting edges of main cusp and lateral cusplets smooth and razor-like, and continuous from apex to base; main cusp and lateral cusplets nearly erect to gently curved lingually; concave crown base and distinct tooth neck on lingual face; prominent tooth neck also on labial face in tall teeth, forming rounded ledge with thin enameloid layer that grades into enameloid of main cusp and lateral cusplets; bilobed root with rounded basal tips and moderately tight basal concavity in between; root overall robust but particularly at lingual protuberance that generally exhibits one or two prominent and a few smaller nutritive foramina; root width slightly wider than total crown width; osteodentine tooth histology.

Remarks
shark-references Species-ID=14704;
type species of Megalolamna Shimada et al., 2016 p. 706 [24480] by original designation (Art. 68.2 ICZN);

valid after Shimada et al. (2017) p. 706 [24480];

References