''Corydoras revelatus'' is an extinct species of callichthyid catfish known from a single specimen found in Late

Paleocene The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), E ...

strata of the Mais Gordo Formation in

Salta Salta () is the capital and largest city in the Argentine province of the same name. With a population of 618,375 according to the 2010 census, it is also the 7th most-populous city in Argentina. The city serves as the cultural and economic ce ...

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

. According to

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of the strata, the fossil specimen is about 58.2–58.5 million years old. Compared to modern species, ''C. revelatus'' has a short, comparatively rounded head, and rather low-set eyes. Although the species's position within the genus ''

Corydoras ''Corydoras'' is a genus of freshwater catfish in the family Callichthyidae and subfamily Corydoradinae. The species usually have more restricted areas of endemism than other callichthyids, but the area of distribution of the entire genus almost ...

'' is tentative and unresolved, its anatomy confirms that it is a member of the subfamily, Corydoradinae, and demonstrates that the callichthyids had already diverging or diversifying before the end of the Paleocene.

References

* Lundberg, Sullivan, Discovery of African roots for the Mesoamerican Chiapas catfish, ''Lacantunia enigmatica'', requires an ancient intercontinental passage''

Paleocene fish Corydoras Fossil taxa described in 1925 {{callichthyidae-stub