Heterodontus sp.

Adolfssen, Jan S. & Ward, David J., 2015, Neoselachians from the Danian (early Paleocene) of Denmark, Acta Palaeontologica Polonica 60 (2), pp. 313-338 : 326

Heterodontus sp.

Fig. 5I, J .

Material.—Anterior and lateral tooth from the Br2 at Faxe MGUH 298451, OESM-10046-13).

Description.—The anterior tooth is poorly preserved. It has a single rounded principal cusp and a single mesial cusplet and two distal cusplets, the more distal being very small. The labial crown base is only slightly ornamented. The lateral tooth bears a long straight carina, no central cusp, and is ornamented by a series of fine ridges originating from the carina and passing at right angles across the crown.

Remarks.—This large tooth, which probably represents an undescribed species, despite having a distinct carina, is closer to the H. portusjacksoni grouping in ornamentation, consisting of fine striae rather than large pits. It is similar in morphology to the Late Cretaceous species H. lonzeensis (Herman, 1977) and less inflated than the Paleocene species H. lerichei ( Casier, 1943) . Case and Borodin (2000) published a new species H. elongatus from the middle Eocene of North Carolina ( USA), which shares a similar morphology, with a faint ornamentation on the anterior teeth, but with less distinct ridges on the lateral teeth.

Figures

Fig. 5. Orectolobiformes and Heterodontiformes from the Danian of Stevns Kridtbrud, Kulstirenden, Faxe kalkbrud, and Terkelskov Kalkvaerk. A–E. Delpitoscyllium planum (Davis, 1890). A. MGUH 1400, holotype (Br2) anterior tooth in labial (A 1), basal (A 2), and lateral (A 3) views. B. OESM-10046-20 Br2) anterior tooth in labial (B 1), basal (B 2), and lateral (B 3) views. C. OESM-10046-21 (Br2) anterior tooth in labial (C 1), basal (C 2), and lateral (C 3) views. D. OESM-10046-19 (Br2) lateral tooth in labial (D 1), basal (D 2), and lateral (D 3) views. E. OESM-10046-22 (Br2) posterior tooth in labial (E 1), basal (E 2), and lateral (E 3) views. F–H. Heterodontus rugosus (Agassiz 1843). F. MGUH 29848 (Ce) anterior tooth in labial (F 1), lingual (F 2), and lateral F 3) views. G. MGUH 29849 (Ce) lateral tooth in occlusal view. H. MGUH 29850 (Ce) lateral tooth in labial (H 1), occlusal (H 2), and lateral (H 3) views., J. Heterodontus sp. I. MGUH 298451 (Br2) anterior tooth in labial view. J. OESM-10046-13 (Br2) lateral tooth in occlusal view.