Egertonodus Explained

Egertonodus is an extinct genus of shark-like hybodont fish. It includes E. basanus from the Jurassic of Europe and North Africa and Cretaceous of North America, North Africa and Europe, and E. duffini from the Middle Jurassic of England.[1] [2] Indeterminate remains of the genus have been reported from the Early Cretaceous of Asia.[3] E. basanus is known from preserved skull material,[4] while E. duffini is only known from teeth. The genus is distinguished from Hybodus sensu stricto by characters of the skull and teeth.[5] E. basanus, the most common species, is thought to have reached 1.5 m (4 ft 11in) in length.[6] E. fraasi from the Late Jurassic of Germany, known from a poorly preserved full body fossil, was placed in Egertonodus in one study, but this has been subsequently questioned by other authors, due to strong differences in tooth morphology from the type species.[7] Fossils have been found in freshwater and lagoonal environments.[8] [9]

Notes and References

  1. Web site: †Egertonodus basanus Egerton 1845 (elasmobranch) . 28 August 2023 . fossilworks.org.
  2. Web site: Egertonodus duffini Rees & Underwood, 2008 . 28 August 2023 . shark-references.com.
  3. Teng . Yu He . Sone . Masatoshi . Hirayama . Ren . Yoshida . Masataka . Komatsu . Toshifumi . Khamha . Suchada . Cuny . Gilles . 2019-01-02 . First Cretaceous fish fauna from Malaysia . Journal of Vertebrate Paleontology . en . 39 . 1 . e1573735 . 10.1080/02724634.2019.1573735 . 2019JVPal..39E3735T . 155143419 . 0272-4634.
  4. Lane . Jennifer A. . 2010-03-04 . Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning . American Museum Novitates . en . 3681 . 1–70 . 10.1206/681.1 . 83939893 . 0003-0082.
  5. Rees . Jan . Underwood . Charlie J. . 17 January 2008. Hybodont Sharks of the English Bathonian and Callovian (Middle Jurassic) . Palaeontology . en . 51 . 1 . 117–147 . 10.1111/j.1475-4983.2007.00737.x . 2008Palgy..51..117R . 48229914 . 0031-0239. free .
  6. Web site: Have you seen the 120 million year old shark fossil yet? See it at Dinosaur Isle . 28 August 2023 . onthewight.com. 7 January 2015 .
  7. Villalobos-Segura . Eduardo . Stumpf . Sebastian . Türtscher . Julia . Jambura . Patrick L. . Begat . Arnaud . López-Romero . Faviel A. . Fischer . Jan . Kriwet . Jürgen . March 2023 . A Synoptic Review of the Cartilaginous Fishes (Chondrichthyes: Holocephali, Elasmobranchii) from the Upper Jurassic Konservat-Lagerstätten of Southern Germany: Taxonomy, Diversity, and Faunal Relationships . Diversity . en . 15 . 3 . 386 . 10.3390/d15030386 . 1424-2818 . 7614348 . 36950327. free.
  8. Bermúdez-Rochas . David Didier . November 2009 . New hybodont shark assemblage from the Early Cretaceous of the Basque-Cantabrian Basin . Geobios . en . 42 . 6 . 675–686 . 10.1016/j.geobios.2009.06.004. 2009Geobi..42..675B .
  9. Turmine-Juhel . Pernelle . Wilks . Richard . Brockhurst . David . Austen . Peter A. . Duffin . Christopher J. . Benton . Michael J. . December 2019 . Microvertebrates from the Wadhurst Clay Formation (Lower Cretaceous) of Ashdown Brickworks, East Sussex, UK . Proceedings of the Geologists' Association . en . 130 . 6 . 752–769 . 10.1016/j.pgeola.2019.08.003. 2019PrGA..130..752T . 202904040 .

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