Negaprion frequens Dames, 1883

Vliet, Hendrik Jan Van, Schulp, Anne S., Abu El-Kheir, Gebely A. M. M., Paijmans, Theo M., Bosselaers, Mark & Underwood, Charles J., 2017, A new Oligocene site with terrestrial mammals and a selachian fauna from Minqar Tibaghbagh, the Western Desert of Egypt, Acta Palaeontologica Polonica 62 (3), pp. 509-525 : 518

Negaprion frequens Dames, 1883

Fig. 12G .

Material.—41 mostly damaged teeth (CGM67191: 13, CGM67194: one, CGM67195: 27) from the BOS, early Oligocene, Minqar Tibaghbagh, Qattara Depression, Egypt. Dimensions: height 6–22 mm, width 3–10 mm.

Description.—Teeth are small and slender. There is a single slender erect cusp, which is somewhat distally inclined in posterior teeth but more commonly vertical. This is unornamented and has a smooth cutting edge. There are very weakly developed lateral extensions of the crown on the upper edge of the root. The root is low and straight to somewhat bent basally.

Remarks.—Teeth are very similar to typical specimens of Negaprion frequens seen elsewhere in North Africa ( Adnet et al. 2011; Underwood et al. 2011).

Negaprion frequens from the Daba’a Formation at Minqar Tibaghbagh has been described by Zalmout et al. (2012). Negaprion frequens is known from the late Eocene and early Oligocene of Egypt, and the middle and late Eocene of South Western Morocco in Africa, the middle Eocene of Qatar and late Eocene of Jordan in Asia ( Zalmout et al. 2012).

Figures

Fig. 12. A–C. Carcharhiniformes and Myliobatiformes from the BOTM, early Oligocene, Minqar Tibaghbagh, Qattara Depression, Egypt; photographed and left in the field. A. Carcharhinus sp., incomplete upper tooth in lingual view. B, C. “Aetobatus” sp. B. Lower tooth in occlusal (B1) and basal (B2) views. C. Lower tooth in occlusal view. D–M. Carcharhiniformes and Lamniformes from the BOS, early Oligocene, Minqar Tibaghbagh, Qattara Depression, Egypt. D. Hemipristis cf. serra Agassiz, 1835 (1843) (CGM67195), upper lateral teeth in lingual (D1, D2, D4) and labial (D3) views. E. Carcharhinus cf. perseus Adnet,Antoine, Hassan Baqri, Crochet, Marivaux, Welcomme, and Métais, 2007 (CGM67194), upper antero-lateral teeth in lingual view. F. Carcharhinus sp. (CGM67195), upper teeth in lingual (F1, F4, F5, F6) and labial (F2, F3) views. G. Negaprion frequens (Dames, 1883) (CGM67191), lower teeth in lingual (G1, G3, G4) and lateral (G2, G5) views. H. Galeocerdo sp. (CGM67195) in lingual view. I–L. Otodus (Carcharocles) cf. sokolowi. I. CGM67195, upper tooth in lingual view. J. CGM69186 upper tooth in lingual (J1) and labial (J2) views. K. CGM69186, lower tooth in labial view. L. CGM69186, lower tooth in lingual (L1) and labial (L2) views. M. Carcharias? sp. (CGM67195), lower teeth in lateral (M1) and lingual (M2) views.