Old Fish Fossil Suggests That Humans Don't Share a Common Ancestor With Sharks, Claim Researchers In 2015, researchers ...

The find expands our understanding of the early developmental stages of rays and their evolutionary branches.

Sharks and rays have populated the world's oceans for around 450 million years, but more than a third of the species living today are severely threatened by overfishing and the loss of their habitat.

The Devonian ancestors of fishes living today belonged to two main nonarmored groups. The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays.

But what did they evolve from, are they 'living fossils', and how did they survive five mass extinctions? Sharks belong to a group of creatures known as cartilaginous fishes, because most of their ...

But we’ve learned a lot about the history and evolution of sharks from their fossilised teeth. ‘We think early sharks developed a cartilaginous skeleton because it better suited their lifestyle,’ ...

Scientists have traced the evolutionary origin of humans' outer ears to the gills of ancient fish through a series of gene-editing experiments.

Rising CO2 levels threaten sharks and rays - our report in category News in DiveInside - the fresh online magazine of Taucher.Net ...