Curated OER
Fishes
In this fish activity, students will review the characteristics of fish by comparing the jaws, skeleton, and fertilization of each fish class. Then students will use a phylogenetic tree to compare the groups of fish to ancestral...
Palomar Community College District
Palomar College: Class
In the animal kingdom, there are seven living classes in the phylum Vertebrata. The Palomar College shares detailed information on each of these classes. Includes examples and photos as well as a follow-up quiz.
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.
Other
Pelagic Shark Research Foundation: Glossary
A glossary for terms relating specifically to sharks, many of which are relevant to the entire chondrichthyes class.
Other
Elasmo.com/guitarfish, Skates, and Rays
Brief overview of this lesser known group of Chondrichthyes. Links to the description of any of a variety of these fish.
John Wiley & Sons
Wiley: Earth Through Time: Life of the Paleozoic: Phylum Chordata
Learn about the evolution of life in the Paleozoic Era based on fossil evidence of the five classes of fishes. Read about the role these chordates played in the evolution of tetrapods.
CK-12 Foundation
Ck 12: Life Science: Cartilaginous Fish
[Free Registration/Login may be required to access all resource tools.] Cartilaginous fish range in size from the dwarf lanternshark, at 6.3 inches, to the 50-foot whale shark. These fish have a jaw and evolved from the jawless 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!
Biology Pages
Kimball's Biology Pages: Vertebrate Kidneys
Everything you've ever wanted to know about vertebrate kidneys. Modules include Freshwater Vertebrates, Amphibians, Lizards and Snakes, Birds, Mammals, Marine Fishes. Resources can be used as classroom notes or supplemental materials.
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.
PBS
Pbs: Great White Shark
A concise look at the traits of the great white with a focus on it's position within the food chain.
Other
Elasmo: Lee Creek Fauna
A list of some representative Rays and Skates found in the fossil record of a particular area. A good look at the body form of a number of these animals.
DLTK
Kid Zone: Sharks
The KidZone shows amazing images of sharks and presents all kinds of facts and activities in a format for grade school children.