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.

Near the rocky beaches of inner Nova Scotia, a researcher’s hunch led to the discovery of a new prehistoric species. /iStock ...

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

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.

UC Davis study of 161 fish species using high-speed video reveals evolutionary trade-off: large teeth prevent mobile jaw development.

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 ...

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

In comparison, most early ray-finned fish would have been around 10 inches. At that size, the fish could have been a top predator in this coastal lake, Lucas said.