Most saltwater fish may have evolved from a freshwater ancestor, according to a new study that traces the family tree of both marine and freshwater fish. The finding may seem topsy-turvy given that ...

The fish clade Pelagiaria, which includes tunas as its most famous members, evolved remarkable morphological and ecological variety in a setting not generally considered conducive to diversification: ...

The ability to determine relationships of Cenozoic fossil fishes relies heavily on having osteological information from their extant relatives with which to compare the fossil remains. For many higher ...