Class Chondrichthyes includes chimaeras, sharks and rays. The skeletons of these fish are composed of cartilage and do not contain true bone although the notochord is calcified to form bone-like vertebrae. They are also distinguished from the bony fish in lacking a swim bladder and bony operculum protecting the gills. The scales do not overlap and the tail is typically asymmetric, having a larger upper lobe.

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Alessandro De Maddalena: Shark Specialist
Personal page with details of his research on sharks, his work as a marine wildlife illustrator, collaborations and publications.
American Elasmobranch Society
An organization devoted to the study and conservation of sharks, rays, skates and chimeras.
Cartilaginous Fishes: Class Chondrichthyes
The most distinctive feature of this class is that their entire skeleton, including the skull, is cartilaginous without any true bone. The class include the sharks and rays, many of which are described here.
Wikipedia article on this class of cartilaginous fish, their anatomy, biology and taxonomy.
Provides information on the fossil record of sharks and their kin, their life history, ecology, systematics and morphology.
Class Chondrichthyes
Taxonomic information on cartilaginous fishes: sharks, rays and chimaeras.
Dedicated Shark Site
Provides detailed information on many shark species and general information about sharks.
GoldenStateImages - Sharks of the California Coast
Photography of sharks found off the California coast includes blue shark, and mako shark.
Infoplease - Sharks!
Myths, facts, and statistics, how to avoid a shark attack, and the shark hall of fame.
Introduction to the Chondrichthyes
UCMP Berkeley's introduction to the cartilaginous fish, including sharks.
A comprehensive source of information on the biology of sharks and rays including behavioral studies.
Wikipedia provides a great deal of information about sharks, their biology and classification, accompanied by photographs and diagrams.
Shark Foundation
Facts, images, and information on projects and activities organized by the foundation. In English and German.
Shark Photographs
Underwater photographs and information about many species of sharks and rays.
Shark Research Committee
Research of North America's Pacific Coast sharks, including White Shark (Carcharodon carcharias) diet, distribution, behavior, encounters, and attacks.
Shark Research Program at the University of Florida Museum of Natural History
Attack statistics, breaking news about sharks, information about Great white and Megamouth sharks, shark attack file, and a commercial shark fishery observer program.
Archives of the e-mail group for discussion of sharks and cartilaginous fish.
Sharks Gallery
Photos of sharks with no text.
Swell Shark: Cephaloscyllium ventriosum
Photograph of an embryo of this species developing inside its “mermaid purse” egg case.
Torpedoes, Skates and Rays: Order Batoidei
Characteristics of these fish in the subclass Elasmobranchii, which includes the Torpedoes, Skates, Sting Rays and Devil Rays.

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