Eothynnus

Eothynnus is an extinct species of prehistoric jackfish that lived during the lower Eocene of Europe and eastern North America. It contains a single species, E. salmoneus.[1][2] It is known primarily from some preserved skulls from what is now the Isle of Sheppey (as a part of the London Clay Lagerstatten) in England.[3] A single vertebra is also known from the Nanjemoy Formation of Virginia, US.[4]

It was originally thought to be a tuna or mackerel, hence the generic name translating as "dawn" or "Eocene tuna."[2] Later, it was reappraised to be a jackfish, related to Teratichthys and Eastmanalepes (syn. "Caranx primaevus").[5][6] It is one of the largest fish known from the London Clay.[4]

## See also

* Prehistoric fish
* List of prehistoric bony fish

## References

1. ↑ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: 560. Archived from the original on 2011-07-23. https://web.archive.org/web/20110723131237/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class. Retrieved 2009-02-27.
2. ↑ 2.0 2.1 Geology, British Museum (Natural History) Department of; Woodward, Arthur Smith (1901) (in en). Catalogue of the Fossil Fishes in the British Museum (Natural History): Actinopterygian Teleostomi of the suborders Isospondyli (in part), Ostariophysi, Apodes, Percesoces, Hemibranchii, Acanthopterygii, and Anacanthini. order of the Trustees. https://books.google.com/books?id=ZtEKAQAAIAAJ.
3. ↑ "PBDB Taxon". https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=263693.
4. ↑ 4.0 4.1 Weems, Robert E. (2021). "ADDITIONS TO THE BONY FISH FAUNA FROM THE EARLY EOCENE NANJEMOY FORMATION OF MARYLAND AND VIRGINIA (U.S.A)". The Mosasaur : The Journal of the Delaware Valley Paleontological Society XI: 117-152. https://www.researchgate.net/publication/348579659_The_Mosasaur_The_Journal_of_the_Delaware_Valley_Paleontological_Society_Editor_Layout_Editor_ADDITIONS_TO_THE_BONY_FISH_FAUNA_FROM_THE_EARLY_EOCENE_NANJEMOY_FORMATION_OF_MARYLAND_AND_VIRGINIA_USA.
5. ↑ Monsch, Kenneth A. (2004). "Revision of the scombroid fishes from the Cenozoic of England" (in en). Earth and Environmental Science Transactions of the Royal Society of Edinburgh 95 (3–4): 445–489. doi:10.1017/S0263593300001164. ISSN 1755-6929. Bibcode: 2004EESTR..95..445M. https://www.cambridge.org/core/journals/earth-and-environmental-science-transactions-of-royal-society-of-edinburgh/article/abs/revision-of-the-scombroid-fishes-from-the-cenozoic-of-england/4C0CBDC19BB39C4709617722D6FBE64C.
6. ↑ Bannikov, A. F. (1987). "On the taxonomy, composition and origin of the family Carangidae". Journal of Ichthyology 27 (1): 1–8. https://www.researchgate.net/publication/308986252.

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