Dwardius sudindicus
Underwood, Goswami, Prasad, Verma & Flynn, 2011
Classification: Elasmobranchii Lamniformes incert. fam.
Reference of the original description
Marine vertebrates from the 'middle' Cretaceous (early Cenomanian) of South India. Journal of Vertebrate Paleontology, 31(3), 539–552
Marine vertebrates from the 'middle' Cretaceous (early Cenomanian) of South India. Journal of Vertebrate Paleontology, 31(3), 539–552
Description:
Citation: Dwardius sudindicus Underwood, Goswami, Prasad, Verma & Flynn, 2011: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
Description
Original diagnosis after Underwood, Goswami, Prasad, Verma & Flynn, 2011 [13074]: Lamniform with large teeth showing moderate monognathic and dignathic heterodonty. Parasymphyseal teeth variable in size, some relatively large. All teeth to some degree asymmetrical, with a degree of mesiodistal curvature of the main cusp of all teeth other than some upper anteriors and lower laterals. Upper and lower anterior teeth with lingual curvature of main cusp. Main cusp higher than wide in all teeth and flanked by a single pair of lateral cusplets, which are of similar size on both sides of tooth. Cusplets of similar height to width, triangular, sharply pointed, and divergent in all teeth. Additional incipient cusplets present only on large lower lateral teeth. Prominent neck present at the base of the lingual face of all teeth. No ornament on any teeth. Root robust and ‘U’-shaped with rounded tips of root lobes. Lingual bulge present but not strongly protruding with one or more foramina but no groove.
Original diagnosis after Underwood, Goswami, Prasad, Verma & Flynn, 2011 [13074]: Lamniform with large teeth showing moderate monognathic and dignathic heterodonty. Parasymphyseal teeth variable in size, some relatively large. All teeth to some degree asymmetrical, with a degree of mesiodistal curvature of the main cusp of all teeth other than some upper anteriors and lower laterals. Upper and lower anterior teeth with lingual curvature of main cusp. Main cusp higher than wide in all teeth and flanked by a single pair of lateral cusplets, which are of similar size on both sides of tooth. Cusplets of similar height to width, triangular, sharply pointed, and divergent in all teeth. Additional incipient cusplets present only on large lower lateral teeth. Prominent neck present at the base of the lingual face of all teeth. No ornament on any teeth. Root robust and ‘U’-shaped with rounded tips of root lobes. Lingual bulge present but not strongly protruding with one or more foramina but no groove.
References
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Cretaceous vertebrate fauna of the Cauvery Basin, southern India: Palaeodiversity and palaeobiogeographic implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 431, 53–67
DOI: 10.1016/j.palaeo.2015.04.021
Marine vertebrates from the 'middle' Cretaceous (early Cenomanian) of South India. Journal of Vertebrate Paleontology, 31(3), 539–552
DOI: 10.1080/02724634.2011.574518

Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116

Cretaceous vertebrate fauna of the Cauvery Basin, southern India: Palaeodiversity and palaeobiogeographic implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 431, 53–67
DOI: 10.1016/j.palaeo.2015.04.021

Marine vertebrates from the 'middle' Cretaceous (early Cenomanian) of South India. Journal of Vertebrate Paleontology, 31(3), 539–552
DOI: 10.1080/02724634.2011.574518







