Extinct Phractocephalus
Although the redtail catfish is the only living representative of this genus, there are other members that date back to the upper Miocene. P. nassi was described in 2003, and is from Urumaco, Venezuela. Another undescribed member is known to exist from Acre, Brazil. This genus has a minimum age of about 13.5 million years.
Read more about this topic: Redtail Catfish