GINGLYMOSTOMATIDAE GEN. ET SP. INDET.

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 : 6

GINGLYMOSTOMATIDAE GEN. ET SP. INDET.

( FIG. 2H )

Referred specimen —SC2013.38.7, incomplete anterior tooth.

Remarks —This specimen differs from Nebrius sp. cf. Neb. thielensi (see above) in having only a single pair of large lateral cusplets, and the labial crown foot is distinctively bifid but not drawn out into an elongate basal protuberance. SC2013.38.7 is similar to the anterior teeth of Cretaceous Plicatoscyllium Case and Cappetta, 1997 , but there is no indication of labial crown ornamentation. The single pair of lateral cusplets also distinguishes SC2013.38.7 from the various early Paleogene species of Ginglymostoma (Noubhani and Cappetta 1997) . In terms of gross morphology, SC2013.38.7 is similar to Protoginglymostoma ypresiensis ( Casier, 1946) from the early to middle Eocene of Belgium and Morocco ( Casier 1946, Herman 1977, Tabuce et al. 2005), but the poor condition of the only available tooth makes a more precise identification difficult.

Figures

Figure 2. Shark teeth from the Dry Branch Formation (Priabonian) of Aiken County, South Carolina. A–D. Notorynchus sp. cf. No. kempi teeth. Lower left tooth in lingual (A) and labial (B) views, SC2013.38.1. Lower right tooth in labial (C) and lingual (D) views, SC96.97.4. E. Squatina sp. cf. Sq. prima. Antero-lateral tooth in labial view, SC96.97.9. F,G. Nebrius sp. cf. Neb. thielensi. Anterolateral tooth in labial (F) and occlusal (G) views, SC2013.38.5. Labial at top in G. H. Ginglymostomatidae. Tooth in labial view, SC2013.38.7. I–O. Carcharias sp. Third lower right anterior tooth in labial (I) view, SC2001.1.55. Third upper right anterior tooth in lingual (J) and labial (K) views, SC2001.1.57. First lower right anterior tooth in labial (L) view, SC2001.1.59. Second lower right anterior tooth in labial (M) view, SC96.97.44.1. Second upper right anterior tooth in lingual (N) view, SC96.97.42. Lower left lateral tooth in lingual (O) view, SC96.97.43. P–S. Alopias sp. Tooth in labial (P) and lingual (Q) views, SC2001.1.65. Tooth in labial (R) and lingual (S) views, SC2001.1.66. Scale bars=1 cm in A–D, I–K, N, O; 5 mm in E–G, L–M, P–S; 1 mm in H.