Eoeugnathus Explained

Eoeugnathus (Greek for "dawn true-jaw") is an extinct genus of prehistoric marine ray-finned fish belonging to the Halecomorphi.^[1] Eoeugnathus existed during the Middle Triassic in what is now Europe.^{[2] [3]} It contains two species:^{[4] [5]}

• E. bellottii (Rueppel, 1857) - Ladinian of Italy and Switzerland (Meride Formation, Perledo-Varenna Formation) (=Allolepidotus bellottii Rueppel, 1857)
• E. megalepis Brough, 1939 (type species) - latest Anisian to late Ladinian of Italy (Besano Formation), Switzerland (Prosanto Formation), and Spain (Muschelkalk)

It was initially placed in the Caturidae and then the Panxianichthyiformes,^[6] but more recent studies have placed it in the new ionoscopiform family Subortichthyidae.^[7]

See also

• Prehistoric fish
• List of prehistoric bony fish

Notes and References

1. https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=35197 The Paleobiology Database Eoeugnathus entry
2. Sepkoski . Jack . A compendium of fossil marine animal genera . Bulletins of American Paleontology . 363 . 1–560 . 2002 . 2009-02-27 . dead . https://web.archive.org/web/20110723131237/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class . 2011-07-23 .
3. Romano . Carlo . Koot . Martha B. . Kogan . Ilja . Brayard . Arnaud . Minikh . Alla V. . Brinkmann . Winand . Bucher . Hugo . Kriwet . Jürgen . 2016 . Permian-Triassic Osteichthyes (bony fishes): diversity dynamics and body size evolution . Biological Reviews . 91 . 1 . 106–147 . 10.1111/brv.12161 . 25431138 . 5332637.
4. Web site: PBDB Taxon . 2025-01-01 . paleobiodb.org.
5. López-Arbarello . Adriana . Brocke . Rainer . 2024-08-19 . New generic name for a small Triassic ray-finned fish from Perledo (Italy) . Swiss Journal of Palaeontology . en . 143 . 1 . 30 . 10.1186/s13358-024-00325-6 . free . 2024SwJP..143...30L . 1664-2384.
6. Zuoyu . Sun . Tintori . Andrea . Yaozhong . Xu . Lombardo . Cristina . Peigang . Ni . Dayong . Jiang . 2017-03-04 . A new non-parasemionotiform order of the Halecomorphi (Neopterygii, Actinopterygii) from the Middle Triassic of Tethys . Journal of Systematic Palaeontology . 15 . 3 . 223–240 . 10.1080/14772019.2016.1181679 . 2017JSPal..15..223Z . 1477-2019.
7. Book: FENG Dong-Hao, XU Guang-Hui . Taxonomic revision of Sinoeugnathus kueichowensis(Halecomorphi, Holostei) from the Middle Triassic ofGuizhou and Yunnan, China . 2023.