Introduction to the Biology of Marine Life, John Morrissey, James Sumich, pp. 169, Jones & Bartlett Publishers, 2011, ISBN 978-0-7637-8160-6, ... Members of this class are often referred to as the cartilaginous fishes, because although their skeletons may be strong, rigid and highly mineralized, they use only cartilage for their skeletons, and the bone tissue characteristic of other vertebrates is absent in all members of this class ... Chondrichthyes tend to be larger in body size than members of the other two classes of fishes ...
