Following the groundbreaking original exploration of the fundamental elements of the taxonomy and interrelationships of sharks, skates, rays, and chimera (Biology of Sharks and Their Relatives, 2004), this second edition presents significant advances in the development and application of new molecular techniques, laboratory devices, and field instruments. Offering a well-rounded picture for advanced students, and far above competitors in scope and research, the numerous papers contained within the volume hold a wealth of data on the current status of chondrichthyan research and provide the basis and springboard for original research.