Triodus

Triodus (lat.) Is a genus of extinct cartilaginous fish similar to sharks from the xenacanth family of the xenacanthos . Lived from the Carboniferous to the Triassic. These were freshwater fish; fossils were found at the Chinle Formation and Black Prince Limestone in Arizona, the Petrified Forest Formation in New Mexico and the Tecovas Formation in Texas, USA ^[1] . In 2017, a new species of Triodus richterae was described from the Rio do Rasto Formation from Brazil ^[2] .

† Triodus
Reconstruction of Triodus sp.
Scientific classification
Domain: Eukaryotes Kingdom: Animals Kingdom : Eumetazoi No rank : Bilateral symmetrical No rank : Secondary Type of: Chordate Subtype : Vertebrates Infratype : Maxillary Group : Fish Grade: Cartilaginous fish Squadron : † Xenacanthomorphs Squad: † Xenacanthoid Family: † Xenacanth Gender: † Triodus
International scientific name
Triodus Jordan, 1849
Geochronology 318.1-212.1 Ma million years Period Era Aeon 2,588 Even Ka F but n e R about s about th 23.03 Neogene 66.0 Paleogen 145.5 a piece of chalk M e s about s about th 199.6 Yura 251 Triassic 299 Permian P but l e about s about th 359.2 Carbon 416 Devonian 443.7 Silur 488.3 Ordovician 542 Cambrian 4570 Precambrian ◄ Nowadays ◄ Cretaceous-Paleogene extinction ◄ Triassic extinction ◄ Mass Permian Extinction ◄ Devonian extinction ◄ Ordovician-Silurian extinction ◄ Cambrian explosion