Oregon Zoo has welcomed 25 rare Pacific lamprey – a 400-million-year-old species native to the Pacific Northwest. The effort is part of a tribal-led initiative to restore lamprey populations ...

Only a few jawless fish round out the picture. This basic grouping has remained remarkably consistent, at least for the last 350 million years.

Parasites in California freshwater fish can cause gastrointestinal problems, weight loss and lethargy.

The First Teeth Grew on the Skin of 460-Million-Year-Old Fish and Were Never Meant for Chewing Teeth may have started as ancient sensory tools, not tools for eating.

The sometimes uncomfortable sensations we feel in our teeth may be an evolutionary holdover from the scaly exteriors of ancient armored fish.

Yara Haridy, an evolutionary biologist at the University of Chicago, likes to stun people by telling them that our skeletons evolved from a jawless fish. "Much of what we have today has been around ...

The breakthrough came when scientists were analyzing fossilized remains of jawless fish like Anatolepis heintzi using high-resolution CT scans.

A jawless alligator spotted in Florida’s Everglades is shocking experts and visitors as it survives despite a rare, severe injury.