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Egertonia Temporal range: Maastrichtian to Middle Eocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Albuliformes
Family:	†Phyllodontidae
Subfamily:	†Phyllodontinae
Genus:	†Egertonia Cocchi, 1866
Species:	†E. isodonta
Binomial name
†Egertonia isodonta Cocchi, 1866

Egertonia (named after paleontologist Sir Philip Grey Egerton, 10th Baronet) is an extinct genus of prehistoric marine and estuarine ray-finned fish known from the Late Cretaceous to the middle Eocene. It contains one known species, E. isodonta, although indeterminate remains potentially referable to other species are also known. It was a member of the Phyllodontidae, an extinct family of elopomorph fish with crushing tooth plates, which are the primary remains found of the genus.

Excluding dubious records from the Campanian (Tar Heel Formation) and Maastrichtian (Severn Formation) of eastern North America, the earliest confirmed occurrences of the genus in the fossil record are from the Maastrichtian of Madagascar (Maevarano Formation) and Tamil Nadu, India (Kallamedu Formation). These formations are suggestive of a fluvial-estuarine environment with frequent marine intrusions. Notably, despite Egertonia expanding its range to the Northern Hemisphere during the Cenozoic, both of these early localities are Gondwanan in origin. These fossil tooth plates are reminiscent of E. isodonta.

As with several other members of its family, Egertonia survived the Cretaceous-Paleogene extinction event and it became more widespread during the Cenozoic, when the type species E. isodonta appears. The earliest remains of E. isodonta are from the Late Paleocene of South Carolina. It becomes much more common during the Eocene, when remains are known from the Ypresian to Bartonian of the eastern United States (Gosport Sand and Tallahatta Formations of Alabama, Tuscahoma Formation of Mississippi, Nanjemoy Formation of Virginia), Ypresian of England (London Clay), and the Lutetian of Barbados (Scotland Formation). Indeterminate Egertonia fossils are known from the Lutetian of England (Selsey Formation), Ypresian of Belgium (Argile des Flandres Formation), and the Ypresian of India (Cambay Shale Formation). It went extinct at some point during the mid-late Eocene.

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. 363: 1–560. Archived from the original on 2011-07-23. Retrieved 2009-02-27.
2. ^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-12-16.
3. ^ Halliday, Thomas; Cuff, Andrew R.; Prasad, Guntupalli V. R.; Thanglemmoi, Mechek S.; Goswami, Anjali (2016). "New record of Egertonia (Elopiformes, Phyllodontidae) from the Late Cretaceous of South India". Papers in Palaeontology. 2 (2): 287–294. doi:10.1002/spp2.1040. S2CID 130394142.
4. Wisconsin-Parksid~summer.ostrowski@uwp.edu, Summer A. Ostrowski~University of (2021-10-03). "Late Cretaceous Elopomorpha (Actinopterygii: Teleostei) from the Mahajanga Basin of Madagascar and impacts on paleobiogeography". Palaeontologia Electronica. doi:10.26879/1151. Retrieved 2024-12-16.

v t e Elopomorph genera
Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Subclass: Neopterygii Infraclass: Teleostei Actinopterygii see Actinopterygii Neopterygii see Neopterygii Teleostei see Teleostei Elopomorpha see below↓ Elopomorpha
Elopiformes †Anaethalion †Aulothrissus †Daitingichthys †Davichthys †Echinelops †Eichstaettia †Elopsomolos †Eoprotelops †Epaelops †Flindersichthys †Ichthyemidion †Leptoelops †Naiathaelon †Protelops †Phyllodontidae Egertonia Eodiaphyodus Paralbula Phyllodus Pseudoegertonia Elopidae †Ctenodentelops Elops †Kipalelops †Lyrolepis †Protoelops Megalopidae †Arratiaelops †Brouweria †Elopoides Megalops †Paratarpon †Promegalops †Protarpon †Sedenhorstia Albuliformes †Baugeichthys †Brannerion †Bullichthys †Euroka †Farinichthys †Holcolepis †Lebonichthys †Marathonichthys †Osmeroides †Palealbula †Paraelops †Protalbula †Stewartichthys Albulidae Albula †Casierius †Deltaichthys †Elopothrissus †Hajulia †Istieus †Italoalbula Nemoossis †Nunaneichthys †Phosphonatator †Pteralbula Pterothrissus Notacanthiformes Notacanthidae Lipogenys Notacanthus Polyacanthonotus Halosauridae Aldrovandia †Echidnocephalus Halosauropsis Halosaurus †Laytonia Anguilliformes see Eels
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• Elopomorpha
• Monotypic prehistoric ray-finned fish genera
• Late Cretaceous bony fish
• Late Cretaceous fish of Asia
• Late Cretaceous fish of Africa
• Paleocene fish
• Eocene fish of North America
• Eocene fish of Europe
• Eocene fish of Asia
• Maastrichtian genus first appearances
• Thanetian genera
• Ypresian genera
• Lutetian genera
• Bartonian genus extinctions
• Fossils of India
• Fossils of Madagascar
• Fossils of the United States
• Fossils of England
• Fossils of Belgium
• Fossils of Barbados
• Fossil taxa described in 1866
• Prehistoric ray-finned fish stubs
• Elopomorpha stubs