Brachycarcharias twiggsensis
(Case, 1981)
Classification: Elasmobranchii Lamniformes Odontaspididae
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
Brachycarcharias twiggsensis
Brachycarcharias twiggsensis
Description:
Citation: Brachycarcharias twiggsensis (Case, 1981): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2025
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Brachycarcharias twiggsensis (Case, 1981), Late Eocene, Priabonian, Daklha, Morocco © Jean-Francois LHOMME, www.vertebres-fossiles.com
Brachycarcharias twiggsensis (Case, 1981), Late Eocene, Priabonian, Daklha, Morocco © Jean-Francois LHOMME, www.vertebres-fossiles.com
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.
References
Fossil chondrichthyans of the Carpathian-Pannonian Region (in Hungarian: A Kárpát-Pannon-térség fosszilis porcoshalai). Hungarian Natural History Museum, Dabasi Nyomda Zrt., Budapest. 255 pages, ISBN 978-963-9877-52-8
Paleogene Fishes of Alabama, Brachycarcharias version 1. In J.A. Ebersole (ed.), Fossil Fishes of Alabama. McWane Science Center, Birmingham, Alabama 4(12), 1–8
DOI: 10.69737/QQGJ1332
Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths. European Journal of Taxonomy, 585, 1–274
DOI: 10.5852/ejt.2019.585
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
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
Fossil chondrichthyans of the Carpathian-Pannonian Region (in Hungarian: A Kárpát-Pannon-térség fosszilis porcoshalai). Hungarian Natural History Museum, Dabasi Nyomda Zrt., Budapest. 255 pages, ISBN 978-963-9877-52-8
Paleogene Fishes of Alabama, Brachycarcharias version 1. In J.A. Ebersole (ed.), Fossil Fishes of Alabama. McWane Science Center, Birmingham, Alabama 4(12), 1–8
DOI: 10.69737/QQGJ1332
Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths. European Journal of Taxonomy, 585, 1–274
DOI: 10.5852/ejt.2019.585
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
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
