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Eosaurichthys Temporal range: Changhsingian to Olenekian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Saurichthyiformes
Family:	†Saurichthyidae
Genus:	†Eosaurichthys Liu & Wei, 1988
Type species
Eosaurichthys chaoi Liu & Wei, 1988
Species
†E. chaoi Liu & Wei, 1988 †E. madagascariensis (Piveteau, 1945)

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). 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.

Up to two species are known:

• E. chaoi Liu & Wei, 1988 - Late Permian (Changhsingian) of China (Changxing Formation)
• E. madagascariensis (Piveteau, 1945) - Early Triassic (Olenekian) of Madagascar (Sakamena Formation)

Saurichthyid remains tentatively referred to E. madagascariensis are known from Anisian-aged freshwater beds of the Yerrapalli Formation in India.

Appearance

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.

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. Retrieved 2009-04-24.
2. ^ 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.
3. ^ "PBDB Taxon". paleobiodb.org. Retrieved 2025-01-20.
4. 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.
5. 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.
6. 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)

v t e Actinopterygian genera
Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata Superclass: Osteichthyes Gnathostomata see Gnathostomata Actinopterygii see below↓
Actinopterygii Actinopterygii †Austelliscus †Cheirolepis †Cuneognathus †Dialipina? †Kentuckia †Krasnoyarichthys †Ligulalepis? †Limnomis †Meemannia †Moythomasia †Naxilepis? †Orvikuina? †Osorioichthys †Palaeoneiros †Pickeringius †Raynerius †Stegotrachelus †Tegeolepis †Terenolepis? †Howqualepididae Donnrosenia Howqualepis †Mimiidae Gogosardina Mimipiscis Post-Devonian taxa see below↓
Post-Devonian taxa Post-Devonian taxa †Adroichthys †Aetheretmon †Agecephalichthys †Amblypterina †Ambodipia †Aneurolepis †Angatubichthys †Apateolepis †Arratiaichthys †Asarotus †Australichthys †Avonichthys †Beagiascus †Belichthys †Bethesdaichthys †Birgeria †Bishofia †Bluefieldius †Blourugia †Boreolepis †Brachydegma †Brachypareion †Brazilichthys †Burguklia †Carbonilepis †Caruichthys †Centrolepis †Charleuxia †Chichia †Coccocephalus †Concentrilepis †Cornuboniscus †Cosmolepis †Cosmoptychius †Cretolepis †Cylindrichthys †Daqingshaniscus †Diplospondichthys †Disichthys †Dmitrevichthys †Drydenius †Duwaichthys †Dwykia †Elpisopholis †Ganolepis †Gardinerichthys †Gardinerpiscis †Gondwanichthys †Grandfieldia †Guaymayenia †Guntherichthys †Gyrolepidoides †Huanghelepis †Hyllingea †Illiniichthys †Inichthys †Irajapintoseidon †Itararichthys †Kalops †Kansasiella †Karaunguria †Kazanichthys †Kelliaichthys †Kenderlichthys †Khantausia †Kompasia †Kutaichthys †Lambeia †Lanarkichthys †Lawrenciella †Leptogenichthys †Letovichthys †Lineagruan †Luederia †Mansfieldiscus †Megapteriscus †Melanecta †Mesembrioniscus †Mesonichthys †Mesopoma †Ministrella †Monesedeiphus †Muensterichthys †Myriolepis †Nematoptychius †Neuburgella †Notacmon †Novogonatodus †Nozamichthys †Oxypteriscus †Pacorichthys †Palaeobergia †Paphosiscus †Paradrydenius †Paralogoniscus †Peleichthys †Piratata †Phanerorhynchus †Phanerosteon †Praolepis †Protamblyptera †Pseudohaplolepis †Psilichthys †Pteroniscus †Rastrolepis †Reticulolepis †Roslerichthys †Rubidus †Samarichthys †Santosichthys †Sceletophorus †Schizolepis †Senekichthys †Sinkiangichthys †Sinoniscus †Sixtelia †Sphaerolepis †Spinofacia †Strepheoschema †Sundayichthys †Tanypterichthys †Tanyrhinichthys †Tienshaniscus †Trachelacanthus †Trawdenia †Turgoniscus †Ufalepis †Urosthenes †Usclasichthys? †Uydenia †Uydenichthys †Varialepis †Wayaobulepis †Westlepis †Whiteichthys †Willomorichthys †Woodichthys †Xingshikous †Yogoniscus †Yaomoshania †Zhongweilepis †Acrolepidae Acrolepis Acropholis Challaia Kasanilepis Namaichthys Plegmolepis Progyrolepis? Watsonichthys †Aeduellidae Aeduella Bourbonnella Decazella Neslovicella Platysella Puertollanichthys Schafeevus Spinarichthys Westollia †Aesopichthyidae Aesopichthys Proceramala †Amblypteridae Amblypterus Daphnaechelus Korutichthys? Lawnia Paramblypterus Tchekardichthys Tholonosteon Tholonotus †Bobasatraniiformes Dorypterus Bobasatraniidae Bobasatrania Ebenaqua Ecrinesomus? †Canobiidae Canobius Schaefferius †Discordichthyidae Discordichthys Geryonichthys Mamulichthys Mutovinia †Eigiliidae Eigilia Strelnia †Elonichthyidae Alilepis Elonichthys Palaeostrugia? Meisenheimichthys Rhabdolepis? †Eurynotiformes Mesolepis Paramesolepis Proteurynotus Wardichthys Amphicentridae Amphicentrum Cheirodopsis Eurynotus Styracopteridae Benedenius Fouldenia Styracopterus †Eurynotoidiformes Adzvalepis Alvinichthys Eurynotoides Isadia Kichkassia Lapkosubia Minicholepis Vologdinia †Gonatodidae Gonatodus Pseudogonatodus Usolia †Guildayichthyidae Discoserra Guildayichthys †Haplolepidae Andrewsolepis Blairolepis Braccohaplolepis Haplolepis Millerolepis Parahaplolepis Protohaplolepis Pyritocephalus †Igornichthyidae Commentrya Igornella Igornichthys Setlikia †Palaeoniscidae Atherstonia Cteniolepidotrichia Dicellopyge Ferganiscus Gyrolepis Palaeoniscinotus Palaeoniscum Palaeothrissum Shuniscus Triassodus Weixiniscus †Platysomidae Aestuarichthys Dorsolepis Kargalichthys Ningxiaplatysomus Paranaichthys Platysomus Schaefferichthys Sinoplatysomus Tompoichthys †Ptycholepidae Acrorhabdus Ardoreosomus Boreosomus Chungkingichthys Ptycholepis Yuchoulepis †Pygopteridae Briveichthys Progyrolepis? Pygopterus Zaborichthys †Rhadinichthyidae Cycloptychius Cyranorhis Mentzichthys Pteronisculus? Rhadinichthys Wendyichthys †Saurichthyiformes Yelangichthys Saurichthyidae Costasaurichthys Eosaurichthys Lepidosaurichthys Saurichthys Saurorhynchus Sinosaurichthys †Tarrasiidae Paratarrasius Tarrasius †Turseoidae Pteronisculus? Turfania? Turseodus †Uighuroniscidae Indaginilepis Uighuroniscus Cladistia see Cladistia includes bichirs Actinopteri Chondrostei see Chondrostei includes sturgeons and paddlefish Neopterygii see Neopterygii

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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 ray-finned fish stubs