American Museum of Natural History
American Museum of Natural History: Sharks and Rays: Myth and Reality
Learn about the reproductive system of the dogfish shark through a video gallery. Also read about the myth that sharks must constantly swim or they will die. PDF transcripts are available for each video.
University of California
Ucmp: Introduction to Chondrichthyes
Good introduction from Berkeley's department of paleontology, gives a brief history and the defining characteristics of the class of Chondrichthyes.
PBS
Pbs: Kingdom of the Seahorse
This site provides information about seahorses, including reproduction, behavior and ecology. Provides several links and an interactive menu.
Other
Pelagic Shark Research Foundation: Glossary
A glossary for terms relating specifically to sharks, many of which are relevant to the entire chondrichthyes class.
Australian Museum
Australian Museum Society: Arthropods
A description of what arthropods actually are and a discussion of their origin, as well as some info on research.
CK-12 Foundation
Ck 12: Biology: Fish Evolution and Ecology
[Free Registration/Login may be required to access all resource tools.] Covers the evolution and ecology of fish.
University of Florida
Florida Museum of Natural History: Ichthyology: Fish Groups
Provides information on, and photographs of, the primitive fish classes. Discusses the Superclass Agnatha, the Class Chondrichthyes, and the Osteichthyes. Very interesting, with lots of pictures!
PBS
Pbs Kids: Dinosaur Train
Preschoolers get to hop on board the `Dinosaur Train' to learn about natural science, natural history and palaeontology.
Australian Broadcasting Corporation
Australian Broadcasting Corporation: News in Science: Shark Has Virgin Birth
From ABC News in Science, Jennifer Viegas's article covers results from a recent study in which a female bonnethead shark was able to reproduce without the presence of a male shark.
University of California
Ucmp: Introduction to Chondrostei
Chondrostei is a mostly forgotten group of cartilaginous fish which deserves at least one page, and here it is. Good information on a cartilagnous fish.
Other
Look d.com: Fish Anatomy
This site, which is given by LookD.com, provides a basic overview of fish anatomy. The information is medium in length, and factual, making it worth checking out on the subject.
Other
Look D: Fish Lateral Line System
This site provides information about bony fish lateral line system.