The deep sea, covering approximately 65% of Earth's surface, has long been considered a biological desert. In this extreme ...

Researchers classify the coelacanth under the group Sarcopterygii, which include the earliest ancestors of amphibians, reptiles, and mammals.

Deep-sea fish thrive in extreme pressure, darkness, and pollution, revealing new survival mechanisms and threats.

Adaptations of the teeth and jaws that allow the fish to adapt to a wide range of food sources and habitats are thought to be a factor in their success. Fish, including cichlids, have either ...

Fish at the other end of Earth ... In each case, evolutionary adaptations allow them to exploit a food niche of ants and termites, but the developments occurred independently.