Scientists studied how the sea creatures, also known as chimaeras or ghost sharks, ended up with one of evolution’s most bizarre appendages. By Jack Tamisiea Life in the ocean’s dark depths can be ...

Scientists discovered true teeth growing on the head of the spotted ratfish, a distant shark relative. The toothed structure, called a tenaculum, helps males hold onto females during mating. Genetic ...

There’s a lot of diversity of form among fishes. What we generally think of as standard features (fins, scales and teeth) can present in all sorts of interesting ways from group to group and species ...

Male "ghost sharks"—eerie deep-sea fish known as chimaeras that are related to sharks and rays—have a strange rod jutting from their foreheads, studded with sharp, retractable teeth. New research ...

The researchers identified teeth on the tenaculum of ancient relatives to the modern adult male spotted ratfish. This fossil record helped them establish the historical significance of this structure, ...