Description
Original diagnose after Cappetta & Case (2016) p. 52 [24889]: Compared with Tethylamna twiggsensis, T. dunni possesses teeth of smaller size (34.46mmtotal height for the largest anterior tooth). Anterior teeth are also more slender, and mainly more labio-lingually lattened. he lateral cusplets are usually more slender, sharper, and more hook-shaped. In lateral teeth, the cusp of T. dunni is less wide, with an apical part more bent distally. he main diferences can be noted for the marginal cusplets. In T. dunni they are not very large, rather erect, with a triangular outline and almost of the same size for each pair. In T. twiggsensis the lateral cusplets are larger with clearly asymmetrical pairs. he mesial pair shows a main cusplet triangular, erect and slightly diverging. he main cusplet of the distal pair is larger, asymmetrical, and strongly bent distally, with a covering of its basal mesial part by the cutting edge of the cusp in labial view.

Remarks
shark-references Species-ID=14824;
type species of Tethylamna Cappetta & Case, 2016 p. 50 [24889] by original designation (Art. 68.2 ICZN);

valid after Cappetta & Case (2016) p. 51 [24889]; Ebersole et al. (2019) p. 53 [27789];

References