Gymnura sp.

Cicimurri, David J. & Knight, James L., 2009, Late Oligocene sharks and rays from the Chandler Bridge Formation, Dorchester County, South Carolina, USA, Acta Palaeontologica Polonica 54 (4), pp. 627-647 : 639

Gymnura sp.

Fig. 8H .

Referred specimen.—BCGM 9107.

Comments.—Although crown size and morphology compares favorably to Rupelian Gymnura hovestadti Herman, 1984 , root lobes of our specimen are not as robust. Reinecke et al. (2005) noted that their specimen (Chattian) was similar to G. hovestadti , but because morphological variation within the taxon is unknown (based on only three teeth) they chose not to assign the tooth to any species. Gymnura van Hasselt, 1823 is a rare component of the Chandler Bridge elasmobranch assemblage, being far outnumbered by comparably sized teeth of Raja cecilae Steurbaut and Herman, 1978 (ratio of 900:1).

Figures

Fig. 8. Stingrays from Summerville, upper Chattian. A. Dasyatis cavernosa (Probst,1877), BCGM 9097, occlusal (A1) and labial (A2) view. B. D. cf. cavernosa, BCGM 9103, male tooth, occlusal (B1) and labial (B2) view. C. D. rugosa (Probst, 1877), BCGM 9099, occlusal (C1) and labial (C2) view. D. Dasyatidae gen. et. sp. indet., BCGM 9101, occlusal (D1), labial (D2), and lateral (D3) view. E. BCGM 9106, Dasyatis sp. denticle, lateral−oblique view.