The Evolution of Freshwater Fish: When Did They First Appear and Their Origins?
The first freshwater fish, Haikouichthys, appeared around 530 million years ago. This early vertebrate had a notochord and gills. Myllokunmingia emerged between 540 and 485 million years ago. Both species evolved from earlier Craniata species in aquatic environments. Freshwater fish origins trace back to both jawless fish, such as hagfish and lampreys, and early jawed … Read more