Tethylamna twiggsensis

(CASE, 1981)


Classification: Elasmobranchii Lamniformes Odontaspididae

Reference of the original description
CASE, G.R. (1981)
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176 (1–3): 52–79, 9 fig., 9 pl., 3 tabl.

Synonyms / new combinations and misspellings
Brachycarcharias cf. twiggsensis, Brachycarcharias twiggsensis, Cretolamna twiggsensis, Lamna twiggsensis, Tethylamna cf. twiggsensis

Types
Tethylamna twiggsensis
Holotype: UNSM: 23506; Paratype: UNSM: 23507; UNSM: 23508; UNSM: 23509; UNSM: 23510;


Description:


Citation: Tethylamna twiggsensis (CASE, 1981): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 04/2019

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Tethylamna twiggsensis (CASE, 1981) © G. Case

Distribution Geographic
Priabonian of Georgia, USA, Priabonian of Egypt, western Sahara, Morocco, of Pakistan and of Peru [24889]

Distribution Strategraphy
Eocene

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.

References
ZOUHRI, S. & GINGERICH, P. & ADNET, S. & BOURDON, E. & JOUVE, S. & KHALLOUFI, B. & AMANE, A. & ELBOUDALI, N. & RAGE, J.-C. & DE LAPPARENT DE BROIN, F. & KAOUKAYA, A. & SEBTIA, S. (2018)
Middle Eocene vertebrates from the sabkha of Gueran, Atlantic coastal basin, Saharan Morocco, and their peri-African correlations. Comptes Rendus Geoscience, 350 (6): 310-318
DOI: 10.1016/j.crte.2018.06.006
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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
MALYSHKINA, T.P. & WARD, D.J. (2016)
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
CAPPETTA, H. & CASE, G.R. (2016)
A Selachian Fauna from the Middle Eocene (Lutetian, Lisbon Formation) of Andalusia, Covington County, Alabama, USA. Palaeontographica, Abt. A, 307 (1–6): 43–103
ZALMOUT, I.S. & ANTAR, S.M. & ABD-EL SHAFY, E. & METWALLY, M.H. & HATAB, E.-B.E. & GINGERICH, P.D. (2012)
Priabonian sharks and rays (late Eocene: Neoselachii) from Minqar Tabaghbagh in the Western Qattara Depression, Egypt. Contributions from the Museum of Paleontology, University of Michigan, 32 (6): 71–90
UNDERWOOD, C.J. & WARD, D.J. & KING, C. & ANTAR, S.M. & ZALMOUT, I.S. & GINGERICH, P.D. (2011)
Shark and ray faunas in the Middle and Late Eocene of the Fayum Area, Egypt. Proceedings of the Geologists' Association, 122 (1): 47–66
DOI: 10.1016/j.pgeola.2010.09.004
UNDERWOOD, C.J. & WARD, D.J. & KING, C. & ANTAR, S.M. & ZALMOUT, I.S. & GINGERICH, P.D. (2011)
Shark and ray faunas in the Middle and Late Eocene of the Fayum Area, Egypt. Proceedings of the Geologists' Association, 122 (1): 47–66
DOI: 10.1016/j.pgeola.2010.09.004
ANTAR, M.S.M. (2011)
Paleo-environments of the exposed Eocene Sediments between Wadi El-Hitan and east Siwa in the Egyptian Western Desert based on their faunal content especially the vertebrates. Thesis, Zagazig University, Faculty of Science, Geology Department
ANTAR, M.S.M. (2011)
Paleo-environments of the exposed Eocene Sediments between Wadi El-Hitan and east Siwa in the Egyptian Western Desert based on their faunal content especially the vertebrates. Thesis, Zagazig University, Faculty of Science, Geology Department
ADNET, S. & CAPPETTA, H. & ELNAHAS, S. & STROUGO, A. (2011)
A new Priabonian Chondrichthyans assemblage from the Western desert, Egypt: Correlation with the Fayum oasis. Journal of African Earth Sciences, 61 (1): 27–37
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ADNET, S. & CAPPETTA, H. & TABUCE, R. (2010)
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
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SMADI, A. & ABU AZZAM, H. & ZALMOUT, I.S. & MUSTAFA, H.A. (2003)
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
CIOBANU, R. (2000)
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
CASE, G.R. & BORODIN, P.D. (2000)
Late Eocene selachians from Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson Country, Georgia. Münchner Geowissenschaftliche Abhandlungen, (A), 39: 5–16, 5 pl., 3 fig., 1 tabl.
CIOBANU, R. (1998)
Colecţia de selacieni - Richard Breckner [Richard Breckner selachian collection]. Studii şi comunicări, Științele Naturii, Muzeul Brukenthal, 28: 115–119
CASE, G.R. & WEST, R.M. (1991)
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, 1 pl.
KRUCKOW, T. & THIES, D. (1990)
Die Neoselachier der Paleokaribik (Pisces: Elasmobranchii). Courier Forschungsinstitut Senckenberg, 119: 1–102
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The Eocene selachian fauna from the Fayum Depression in Egypt. Palaeontographica, Abt. A, 212 (1–6): 1–30, 9 pl., 1 fig, 3 tabl.
CASE, G.R. (1981)
Late Eocene selachians from South-central Georgia. Palaeontographica, Abt. A, 176 (1–3): 52–79, 9 fig., 9 pl., 3 tabl.