A trade-off between tooth size and jaw mobility has restricted fish evolution, Nick Peoples at the University of California Davis, US, and colleagues report in the open-access journal PLOS Biology .

In 2015, two members of the Blue Beach Fossil Museum in Nova Scotia found a long, curved fossil jaw, bristling with teeth.

Buried for 209 million years, a tiny flying reptile and its ancient neighbors just emerged from Arizona’s Triassic past.

Ray-finned fish, now the most diverse group of backboned animals, were not as hard hit by a mass extinction event 360 million years ago as scientists previously thought.

The species was named Sphyragnathus tyche, combining Greek words “sphyra,” meaning hammer and “gnathus,” meaning jaw for the ...

Bichir fish have an eel-like body with modified lungs, thick, bonelike scales, and a fleshy pectoral fin, which is shaped like a paddle. Their diamond-shaped ganoid scales have a protective function.

A fisherman captured closeup video of a ray using its fins like wings to literally fly away from a hammerhead shark ...

Coelacanths' fins move in a synchronized pattern similar to four-limbed animals. Coelacanths have center pointed tail fins instead of forked or crescent shaped tails seen in ray-finned fish.

So the researchers went with a family-level analysis, rather than a species-level one, relying on a recent phylogeny of extant ray-finned fish families, which number in the hundreds. Combing the ...

The large fish, spanning nearly a metre on the lake bed, lived in waters thick with rival fish, including giants several times its size ...

Researchers have discovered a new species of ancient fish with hooked front fangs that made them a fearsome and effective ...