There's no such thing as a shark, suggest scientists — BBC Science Focus Magazine

Analysis of shark DNA has thrown a wrench into our understanding of these sharp-toothed predators March 25, 2026 Evolutionary biologists compared the DNA of different sharks to one another, and also to similar but non-shark species such as rays, skates and chimaeras. They found that sharks are not necessarily each other’s closest relations, throwing into question the entire concept of sharks as a biological category. “Our research casts doubt on the idea that sharks all share a common ancestor,