Biology:Enchodus
| Enchodus | |
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| Enchodus petrosus mounted skeleton cast in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Aulopiformes |
| Family: | †Enchodontidae |
| Genus: | †Enchodus Agassiz, 1835 |
| Species | |
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Enchodus (from Greek: ἔγχος enchos, 'spear' and Greek: ὀδούς odoús 'tooth')[6] is an extinct genus of aulopiform ray-finned fish related to lancetfish and lizardfish. Species of Enchodus flourished during the Late Cretaceous, and there is some evidence that they may have survived to the Paleocene or Eocene; however, this may just represent reworked Cretaceous material.[7][8][9]
Taxonomy
Species of Enchodus are generally classified into two different clades, the North American and the Mediterranean. It has been proposed that this distinction is the result of several isolated events between the two populations over the Late Cretaceous.[5]
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| Phylogeny of the genus with some species |
Description
Enchodus species were small to medium in size, large species (E. zinensis) reached 172.2 centimetres (67.8 in).[10] One of the genus' most notable attributes are the large "fangs" at the front of the upper and lower jaws and on the palatine bones, leading to its misleading nickname among fossil hunters and paleoichthyologists, "the saber-toothed herring". These fangs, along with a long sleek body and large eyes, suggest Enchodus was a predatory species.[1]
E. petrosus, with standard length around 76.7 centimetres (30.2 in)[10] and sometimes over 1 metre (3 ft 3 in),[11] remains of which are common from the Niobrara Chalk, the Mooreville Chalk Formation, the Pierre Shale, and other geological formations deposited within the Western Interior Seaway and the Mississippi Embayment. Large individuals of this species had fangs measuring over 6 centimetres (2.4 in) in length, giving its skull an appearance somewhat reminiscent of modern deep-sea fishes, such as anglerfish and viperfish. Other species were considerably smaller, some like E. parvus were only some centimeters (a few inches) long.[12]
Despite being a formidable predator, remains of Enchodus are commonly found among the stomach contents of larger predators, including sharks, other bony fish, mosasaurs, plesiosaurs and seabirds such as Baptornis advenus.[citation needed]
Distribution
Enchodus fossils have been found all over the world. In North America, Enchodus remains have been recovered from most US states with fossiliferous Late Cretaceous rocks, including Kansas , Nebraska, Colorado, Alabama, Mississippi, Georgia, Tennessee , Wyoming, Texas , California , North Carolina, and New Jersey. Fossils also have been found in the Aguja and El Doctor Formations of Mexico and the Ashville, Vermillion River and Dinosaur Park Formations, and Brown Bed Member of Canada . The taxon is also known from coeval strata in Africa, the Middle East, Europe, southwest Asia and the Tiupampan Santa Lucía Formation and Maastrichtian El Molino Formation of Bolivia and the Paraíba, Pernambuco and Sergipe states of Brazil.[2] Potentially the latest Enchodus remains are known from the earliest Eocene of Barmer, India .[8] However, it has also been suggested that all post-Cretaceous Enchodus records are just reworked material.[9]
Gallery
Restoration of E. petrosus
E. lewesiensis skull
Teeth of E. elegans from Khouribga
Teeth of E. libyus from Khouribga
References
- ↑ 1.0 1.1 Everhart, Mike (2013). "Enchodus sp. - The Sabre-Toothed Fish of the Cretaceous". http://www.oceansofkansas.com/Enchodus.html.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 Enchodus at Fossilworks.org
- ↑ "Global Names Index". http://gni.globalnames.org/name_strings?page=190&search_term=ns%3AENC*.
- ↑ "Enchodus libycus". Mundo Fosil. http://mundofosil.net/museo_virtual/fichas/chordata/enchodus_libycus.htm.
- ↑ 5.0 5.1 5.2 Waymon L. Holloway; Kerin M. Claeson; Hesham M. Sallam; Sanaa El-Sayed; Mahmoud Kora; Joseph J.W. Sertich; Patrick M. O’Connor (2017). "A new species of the neopterygian fish Enchodus from the Duwi Formation, Campanian, Late Cretaceous, Western Desert, central Egypt". Acta Palaeontologica Polonica 62 (3): 603–611. doi:10.4202/app.00331.2016.
- ↑ Roberts, George (1839) (in English). An etymological and explanatory dictionary of the terms and language of geology. London: Longman, Orme, Brown, Green, & Longmans. p. 55. https://archive.org/details/anetymologicala00robegoog. Retrieved 30 December 2021.
- ↑ Fielitz, Christopher; González-Rodríguez, Katia A. (2010). "A New Species of Enchodus (aulopiformes: Enchodontidae) from the Cretaceous (albian to Cenomanian) of Zimapán, Hidalgo, México". Journal of Vertebrate Paleontology 30 (5): 1343–1351. doi:10.1080/02724634.2010.501438. Bibcode: 2010JVPal..30.1343F.
- ↑ 8.0 8.1 Rana, R. S.; Kumar, K.; Singh, H.; Rose, K. D. (2005). "Lower vertebrates from the Late Palaeocene–Earliest Eocene Akli Formation, Giral Lignite Mine, Barmer District, western India". Current Science 89 (9): 1606–1613.
- ↑ 9.0 9.1 Davis, Matthew P.; Fielitz, Christopher (December 2010). "Estimating divergence times of lizardfishes and their allies (Euteleostei: Aulopiformes) and the timing of deep-sea adaptations". Molecular Phylogenetics and Evolution 57 (3): 1194–1208. doi:10.1016/j.ympev.2010.09.003. PMID 20854916.
- ↑ 10.0 10.1 Díaz-Cruz, Jesús Alberto; Alvarado-Ortega, Jesús; Ramírez-Sánchez, Marcia M.; Bernard, Emma Louise; Allington-Jones, Lu; Graham, Mark (November 2021). "Phylogenetic morphometrics, geometric morphometrics and the Mexican fossils to understand evolutionary trends of enchodontid fishes". Journal of South American Earth Sciences 111: 103492. doi:10.1016/j.jsames.2021.103492. Bibcode: 2021JSAES.11103492D.
- ↑ Chida, Mori; Brinkman, Donald B.; Murray, Alison M. (October 2023). "A large, new dercetid fish (Teleostei: Aulopiformes) from the Campanian Bearpaw Formation of Alberta, Canada". Cretaceous Research 150: 105579. doi:10.1016/j.cretres.2023.105579. Bibcode: 2023CrRes.15005579C.
- ↑ Everhart, M.J. (2017). Oceans of Kansas, Second Edition: A Natural History of the Western Interior Sea (Life of the Past). Indiana University Press. pp. 117. ISBN 978-0253026323.
Further reading
- Cope, Edward Drinker (1875). "Review of the Vertebrata of the Cretaceous Period Found West of the Mississippi River". Bulletin of the United States Geological and Geographical Survey of the Territories 1 (2): 5–16. Gale BAGPVO689069586. OCLC 879313308. https://books.google.com/books?id=dxW8AAAAIAAJ&pg=RA2-PA5.
- Everhart, Mike (2013). "Enchodus sp. - The Sabre-Toothed Fish of the Cretaceous". http://www.oceansofkansas.com/Enchodus.html.
- Russell, Dale A. (1988). A Check List of North American Marine Cretaceous Vertebrates Including Fresh Water Fishes. Tyrrell Museum of Palaeontology. ISBN 978-1-55006-106-2.
- Davis, Matthew P.; Fielitz, Christopher (December 2010). "Estimating divergence times of lizardfishes and their allies (Euteleostei: Aulopiformes) and the timing of deep-sea adaptations". Molecular Phylogenetics and Evolution 57 (3): 1194–1208. doi:10.1016/j.ympev.2010.09.003. PMID 20854916.
External links
Wikidata ☰ Q5375425 entry
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