Description
Original diagnosis after Cappetta, Morrison & Adnet, 2019 [27810]: The same as for the genus. Squaliform genus with teeth higher than broad and labio-lingually flattened. In lingual view, the crown shows an isosceles triangular outline with a sharp apex and very slightly convex smooth cutting edges. Lingual face is clearly concave with a straight basal limit narrower than the transversal lingual bulge of the root. Labial face of the crown clearly convex transversely and a little less in profile view. In labial view, the enameloid part of the crown is high with marginal limits oblique and concave, converging in a basal apron forming two rounded lobes separated medially by a not very deep and broad notch. This labial face of the crown is in relief, projects over the labial face of the root and stops well before the basal edge of the root. The root is higher than broad, with a rectangular outline and concave marginal limits. Its basal face flat and its basal edge thicken and is in relief compared with the rest of the root surface. A small median notch broaches the basal edge. There is a medially a small main foramen, opening below the transverse lingual bulge. A very superficial and narrow median groove is directed from this foramen towards the notch of the basal edge of the root. Labially, small foramina open above the basal thickening of the root and small ones open on the part of the root straddling the crown.
Genus separating from all other squaliform genera by its teeth displaying a symmetrical triangular crown with a transversely convex labial face and concave lingual face with smooth cutting edges. Absence of articular facets on the root, which has a rectangular outline higher than broad.

Remarks
shark-references Species-ID=15538;
type species of Hessinodon Cappetta, Morrison & Adnet, 2019 [27810] by monotypy (Art. 68.3 ICZN);
valid after Cappetta, Morrison & Adnet, 2021 [27810]

References