Eoptolamna supracretacea

Guinot, Underwood, Cappetta & Ward, 2013


Classification: Elasmobranchii Lamniformes Eoptolamnidae

Reference of the original description
Guinot, G. & Underwood, C.J. & Cappetta, H. & Ward, D.J. (2013)
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6): 589–671

Types
Eoptolamna supracretacea
Holotype: NHMUK: P. 67075;


Description:


Citation: Eoptolamna supracretacea Guinot, Underwood, Cappetta & Ward, 2013: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2021

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Description
Original diagnose after Guinot et al. (2013) p. 635 [24889]: Teeth less than 5 mm high, showing a gradient monognathic heterodonty. Erect main cusp lingually directed with fine lingual folds originating at the base of the crown and not reaching the apex; distinct vertical median ridge on labial face of anterior teeth with short basal folds; numerous sharp-edged labial ridges in anterolateral and lateral teeth. All ridges slightly sinuous and rarely bifurcating. Flat labial face of the main cusp separated from the strongly convex lingual face by well-developed cutting edges; depressed basal edge of the labial face; marked lingual neck. Pair of slender, lingually curved and sharp lateral cusplets with ornament similar to that of the main cusp; lateral cusplets originating well below the main cusp and projecting labially in anterior teeth. Root with marked lingual protuberance in anterior and anterolateral teeth; nutritive groove from open to closed. Well-developed root branches.

Remarks
valid after Guinot et al. (2013) p. 635 [24889];


References
Condamine, F.L. & Romieu, J. & Guinot, G. (2019)
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
Guinot, G. & Underwood, C.J. & Cappetta, H. & Ward, D.J. (2013)
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6): 589–671
DOI: 10.1080/14772019.2013.767286
Guinot, G. (2013)
Regional to global patterns in Late Cretaceous selachian (Chondrichthyes, Euselachii) diversity. Journal of Vertebrate Paleontology, 33(3), 521–531
DOI: 10.1080/02724634.2013.740116
Guinot, G. (2013)
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388: 23–41
DOI: 10.1016/j.palaeo.2013.07.027