This dentition suggests a diet of crustaceans, worms, and small brachiopods, which it likely crushed. This small shark belonged to the obruchevodid group, cartilaginous fish specialized for reef life.

The study, published in PLOS Biology, examined the skeletons of modern-day cartilaginous jawed fishes, like skates and sharks, along with jawless lampreys and hagfish. The jawed skates and sharks have ...

Though the new paper presents the first evidence of a shark making a sound, recent research has revealed that two other types of cartilaginous fish, rays and skates, also make noise. Scientists ...

(Mainichi/Kimitaka Hirayama) MUKAWA, Hokkaido -- A fossilized tooth of a cartilaginous fish found in Japan's northernmost prefecture Hokkaido in 2013 is of a newly discovered species, researchers ...