Dasyatis undetermined

Cicimurri, David J. & Knight, James L., 2022, Late Eocene (Priabonian) elasmobranchs from the Dry Branch Formation (Barnwell Group) of Aiken County, South Carolina, USA, PaleoBios 36, pp. 1-31 : 18

DASYATIS SP.

( FIG. 6Q–Y )

Referred specimens —SC2013.38.49, male tooth; SC2013.38.51, 12 male teeth; SC2013.38.52, tooth; SC2013.38.53, tooth; SC2013.38.54, 39 teeth; SC2013.38.55, tooth; SC2013.38.161, four teeth.

Remarks —These59 teeth differ from those of Dasyatis sp. cf. D. tricuspidatus (see above) in that they are smaller in overall size and are easily distinguished by their highly ornamented labial face ( Fig. 6S, U, W ). It is difficult to make accurate comparisons to other species with highly ornamented teeth (Ward 1979b, Noubhani and Cappetta 1997) due to the lack of enameloid on the Dry Branch specimens. However, the teeth of D. jaekeli ( Leriche, 1905) have ornamentation that is generally restricted to the apical region of the labial face ( Leriche 1905), and ornamentation on D. wochadunensis Ward, 1979b extends well onto the lingual side of the crown. Highly cuspidate teeth bearing weak labial ornamentation (i.e.,

Figures

Figure 6. Batoid teeth from the Dry Branch Formation (Priabonian) of Aiken County, South Carolina. A–D. Rhinobatos sp. Tooth in occlusal (A), labial (B), profile (C), and basal (D) views, SC2013.38.45. E–H. Rhynchobatus sp. cf. Rhy. pristinus. Tooth in occlusal (E), labial (F), profile (G), and basal (H) views, SC2013.38.46. I–P. Dasyatis sp. cf. D. tricuspidatus. Male anterior tooth in labial (I) and distal (J) views, SC2013.38.42. Tooth in labial (K) and occlusal (L) views, SC2013.38.43. Tooth in occlusal (M), labial (N), profile (O), and basal (P) views, SC2013.38.41. Q–Y. Dasyatis sp. SC2013.38.49. Male anterior tooth in labial (Q) and distal (R) views. Tooth in occlusal (S) view, SC2013.38.55. Tooth in occlusal (T), labial (U), and profile (V) views, SC2013.38.52. Tooth in occlusal (W), labial (X), and profile (Y) views, SC2013.38.53. Labial at top in A, D, E, H, L, M, P, S–T, W; at left in C, G, J, O, R, V, Y. Scale bars=1 mm.