Cretolamna twiggsensis
(Case, 1981)
Classification: Elasmobranchii Lamniformes Otodontidae
Reference of the original description
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176(1–3), 52–79
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176(1–3), 52–79
Types
Cretolamna twiggsensis
Cretolamna twiggsensis
Description:
Citation: Cretolamna twiggsensis (Case, 1981): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 12/2024
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Description
Diagnosis after Case 1981 [391]: Teeth ranging in size from 1.5 to 3 cms, and averaging 2.5 cms, a vestigial median furrow (groove) on the root area, teeth with from 1 to 2 lateral cusps on either side. Description: Lower jaw teeth erect. Anterior teeth with slender cuspidate lateral cusps. Lateral teeth wider, with from 1 to 2 lateral cusps, triangular in shape, and the larger of the cusps — flaring out in opposite directions from the tooth blade. No medial furrow (groove), but an imperfectly developed "furrow" on some specimens, with a definitive apical foramen positioned on the lingual boss of the tooth's root.
Diagnosis after Case 1981 [391]: Teeth ranging in size from 1.5 to 3 cms, and averaging 2.5 cms, a vestigial median furrow (groove) on the root area, teeth with from 1 to 2 lateral cusps on either side. Description: Lower jaw teeth erect. Anterior teeth with slender cuspidate lateral cusps. Lateral teeth wider, with from 1 to 2 lateral cusps, triangular in shape, and the larger of the cusps — flaring out in opposite directions from the tooth blade. No medial furrow (groove), but an imperfectly developed "furrow" on some specimens, with a definitive apical foramen positioned on the lingual boss of the tooth's root.
Remarks
shark-references Species-ID=1642;
valid after Zalat et al. (2017) p. 207 [25860];
synonym of Brachycarcharias twiggsensisi after Ebersole et al. (2019) p. 43 [27789];
shark-references Species-ID=1642;
valid after Zalat et al. (2017) p. 207 [25860];
synonym of Brachycarcharias twiggsensisi after Ebersole et al. (2019) p. 43 [27789];
References
Feeding ecology has shaped the evolution of modern sharks. Current Biology, 31(23), 5138–5148
DOI: 10.1016/j.cub.2021.09.028
Taxonomy and morphological study on the vertebrate remains of Shark and rays fauna from the Middle and Late Eocene succession, Fayoum Depression, Egypt. Delta Journal of Science, 38, 202–217
The Turanian Basin in the Eocene: the new data on the fossil sharks and rays from the Kyzylkum Desert (Uzbekistan). Proceedings of the Zoological Institute, Russian Academy of Sciences, 320(1), 50–65
A new Priabonian Chondrichthyans assemblage from the Western desert, Egypt: Correlation with the Fayum oasis. Journal of African Earth Sciences, 61(1), 27–37
DOI: 10.1016/j.jafrearsci.2011.04.005
A Middle-Late Eocene vertebrate fauna (marine fish and mammals) from southwestern Morocco; preliminary report: age and palaeobiogeographical implications. Geological Magazine, 147(6), 860–870
DOI: 10.1017/S0016756810000348
Middle Eocene selachian fauna from Wadi Al-Rijla Al-Bayda, Eastern Desert of Jordan. Abhath Al–Yamouk Basic Sciences and Engineering, 12(2b), 619–631
Angaben zur Hai- und Rochenfauna aus dem Eozän von Turnu Roșu (Rumänien). Naturwissenschaftliche Forschung über Siebenburgen VI. Beitrage zur Geographie, Botanik, Zoologie und Palaontologie. Siebenburgisches Archiv, 36, 265–270
Late Eocene selachians from Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson Country, Georgia. Münchner Geowissenschaftliche Abhandlungen Reihe A, Geologie und Paläontologie, 39, 5–16, 5 pl., 3 fig., 1 tabl.
Colecţia de selacieni - Richard Breckner [Richard Breckner selachian collection]. Studii şi comunicări, Științele Naturii, Muzeul Brukenthal, 28: 115–119
Geology and Paleontology of the Eocene Drazinda Shale Member of the Khirthar Formation, central Western Pakistan, Part II Late Eocene fishes. Tertiary Research, 12(3–4), 105–120
The Eocene selachian fauna from the Fayum Depression in Egypt. Palaeontographica, Abt. A, 212(1–6), 1–30
Feeding ecology has shaped the evolution of modern sharks. Current Biology, 31(23), 5138–5148
DOI: 10.1016/j.cub.2021.09.028
Taxonomy and morphological study on the vertebrate remains of Shark and rays fauna from the Middle and Late Eocene succession, Fayoum Depression, Egypt. Delta Journal of Science, 38, 202–217
The Turanian Basin in the Eocene: the new data on the fossil sharks and rays from the Kyzylkum Desert (Uzbekistan). Proceedings of the Zoological Institute, Russian Academy of Sciences, 320(1), 50–65
A new Priabonian Chondrichthyans assemblage from the Western desert, Egypt: Correlation with the Fayum oasis. Journal of African Earth Sciences, 61(1), 27–37
DOI: 10.1016/j.jafrearsci.2011.04.005
A Middle-Late Eocene vertebrate fauna (marine fish and mammals) from southwestern Morocco; preliminary report: age and palaeobiogeographical implications. Geological Magazine, 147(6), 860–870
DOI: 10.1017/S0016756810000348
Middle Eocene selachian fauna from Wadi Al-Rijla Al-Bayda, Eastern Desert of Jordan. Abhath Al–Yamouk Basic Sciences and Engineering, 12(2b), 619–631
Angaben zur Hai- und Rochenfauna aus dem Eozän von Turnu Roșu (Rumänien). Naturwissenschaftliche Forschung über Siebenburgen VI. Beitrage zur Geographie, Botanik, Zoologie und Palaontologie. Siebenburgisches Archiv, 36, 265–270
Late Eocene selachians from Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson Country, Georgia. Münchner Geowissenschaftliche Abhandlungen Reihe A, Geologie und Paläontologie, 39, 5–16, 5 pl., 3 fig., 1 tabl.
Colecţia de selacieni - Richard Breckner [Richard Breckner selachian collection]. Studii şi comunicări, Științele Naturii, Muzeul Brukenthal, 28: 115–119
Geology and Paleontology of the Eocene Drazinda Shale Member of the Khirthar Formation, central Western Pakistan, Part II Late Eocene fishes. Tertiary Research, 12(3–4), 105–120
The Eocene selachian fauna from the Fayum Depression in Egypt. Palaeontographica, Abt. A, 212(1–6), 1–30
