While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

Early jawless fish were likely to have used bony projections surrounding their mouths to modify their mouth shape while they ...

Jawlene, who is missing her top jaw, lives happily at Gatorland Orlando with her turtle friend after being rescued in 2023.

In this study, Sharma and colleagues examined the anatomy and development of joints in members of two early-branching vertebrate lineages: one species of jawless fish, sea lampreys, and two ...

It does not have a true jaw, hence sometimes lampreys and a few other jawless fishes are referred to as "Agnthans", meaning literally "without jaws". Instead, the adult lamprey has "cusps" in its ...

The most ancient fish were jawless, and since our whole group has jaws, we can safely choose a jawless fish as a fairly recent ancestor. Unfortunately, this ancestor is long dead. To compare ...

In this study, Sharma and colleagues examined the anatomy and development of joints in members of two early-branching vertebrate lineages: one species of jawless fish, sea lampreys, and two ...

They are fishes, but belong to an exclusive group called cyclostomes, also known as jawless fishes. They are joined in this group by the equally wonderfully weird lampreys. There are 76 species of ...

These joint cavities can be seen in cartilaginous fish such as skates or sharks. However, when the researchers studied jawless fish such as lampreys and the hagfish, not a single synovial joint cavity ...

More information: Sharma N, et al. Synovial joints were present in the common ancestor of jawed fish but lacking in jawless fish. PLOS Biology (2025). DOI: 10.1371/journal.pbio.3002990 ...

The fierce reptile, named Jawlene, was found in the wild and Florida Fish and Wildlife officials sent a trapper to rescue her and bring her to Gatorland Orlando. In 2023, the baby gator garnered a ...