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.
MarineBio Conservation Society
Marine Bio: Pacific Hagfishes
Illustrated reference guide features useful information on the Pacific hagfish with facts on physical characteristics, behavior, range, habitat, diet, and conservation status.
California Academy of Sciences
California Academy of Sciences: Echinoderm Webpage
Resource provides a brief overview of echinoderms. Includes pictures and links for more information.
Biology 4 kids
Biology4 Kids: Here Fishy Fishy
Identify the evolution of fish from 500 years ago to today. Find out the attributes of each of the four main types of fish.
CK-12 Foundation
Ck 12: Life Science: Jawless Fish
[Free Registration/Login may be required to access all resource tools.] What defines a jawless fish? You can probably guess. A jawless fish is a fish without a jaw. But there are other features that are shared by this class of organisms....
Other
Sea and Sky: Creatures of the Deep Sea: Atlantic Hagfish
A profile of information about the Atlantic Hagfish, including photos.
Curated OER
Wiley: Earth Through Time: Jawless Fish
Illustrations of various types of Early Paleozoic ostracoderms.