Eosaurichthys
| Eosaurichthys Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | †Saurichthyiformes |
| Family: | †Saurichthyidae |
| Genus: | †Eosaurichthys Liu & Wei, 1988 |
| Type species | |
| Eosaurichthys chaoi Liu & Wei, 1988
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| Species | |
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Eosaurichthys ("dawn Saurichthys") is an extinct genus, or potentially subgenus, of marine saurichthyid ray-finned fish that lived during the late Permian epoch (Changhsingian age) to potentially the Early Triassic epoch (Olenekian).[1] It is one of the earliest saurichthyid genera known from the fossil record. If E. madagascariensis is a member of this genus, then it appears to have survived the Permian-Triassic extinction event.
Eosaurichthys is often treated as a subgenus of Saurichthys rather than a genus, with its type species referred to as Saurichthys (Eosaurichthys) chaoi.[2]
Up to two species are known:[2][3]
- E. chaoi Liu & Wei, 1988 - Late Permian (Changhsingian) of China (Changxing Formation)
- E. madagascariensis (Piveteau, 1945) - Early Triassic (Olenekian) of Madagascar (Sakamena Formation)[4][5]
Saurichthyid remains tentatively referred to E. madagascariensis are known from Anisian-aged freshwater beds of the Yerrapalli Formation in India.[3]
Appearance
[edit]Eosaurichthys closely resembles its daughter genus, Saurichthys, in both form and morphology. Its body is fully covered by scales, while in Saurichthys the scale cover is reduced.[2][6]
See also
[edit]
References
[edit]- ^ a b Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 364: 560. Archived from the original on 2011-07-23. Retrieved 2009-04-24.
- ^ a b c Tintori, Andrea (2013). "A new species of Saurichthys (Actinopterygii) from the Middle Triassic (early Ladinian) of the northern Grigna Mountain (Lombardy, Italy)". Rivista Italiana di Paleontologia e Stratigrafia. 119 (3): 287–302. doi:10.13130/2039-4942/6041.
- ^ a b "PBDB Taxon". paleobiodb.org. Retrieved 2025-01-20.
- ^ Maxwell, E.E.; Romano, C. & Wu, F.-X. (2021). "Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non‐teleostean actinopterygians". Journal of Zoology. 315: 29–41. doi:10.1111/jzo.12878.
- ^ Silvio Renesto; Fabio Magnani; Rudolf Stockar (2021). "A new species of Saurichthys (Actinopterygii: Saurichtydae) from the Middle Triassic of Monte San Giorgio". Rivista Italiana di Paleontologia e Stratigrafia. 127 (1): 49–71. doi:10.13130/2039-4942/15143.
- ^ Romano C., Kogan I., Jenks J., Jerjen I., Brinkmann W. (2012). "Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution" (PDF). Bulletin of Geosciences. 87: 543–570. doi:10.3140/bull.geosci.1337.
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- Prehistoric ray-finned fish genera
- Saurichthyiformes
- Late Permian fish
- Permian fish of Asia
- Triassic fish of Africa
- Changhsingian genus first appearances
- Olenekian genera
- Early Triassic genus extinctions
- Fossils of China
- Fossils of Madagascar
- Fossil taxa described in 1988
- Chondrostei stubs
- Prehistoric bony fish stubs