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 ...

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 ...

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 ...

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 ...

cartilaginous fish, Chondrichthyes; and jawless fish, Agnatha. The discipline can include the biology, taxonomy and conservation of fish, as well as husbandry and commercial fisheries.

Lampreys, a jawless fish, evolved over 450 million years ago. They’re older than dinosaurs, and even trees, and are still around in spite of at least four mass extinction events.

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 ...

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 ...