Introduction to the Chordata. University of California, Berkeley. Explains features common to all chordates, with summaries of the fossil record, life, history and ecology of chordates, and systematics of chordates.
The Shape of Life--Cordates. PBS. Brief explanation of chordates from the PBS series with links and short video clips.
Introduction to the Cephalochordata. University of California, Berkeley. Explains features of the eel-like cephalochordates (lancelets) that have been useful for understanding early vertebrate evolution.
See also the Burgess Shale and look for Pikaia
The Shape of Life—Arthropods. PBS. Brief explanation of arthropods from the PBS series with links and short video clips.
Introduction to the Arthropods. University of California, Berkeley. Explains features common to all arthropods, with summaries of the fossil record, life, history and ecology of arthropods, and systematics of arthropods.
The Arthropod Story. Tree of Life Project. On-line storybook format contains information about what arthropods are, Cambrian arthropods, the importance of exoskeletons, and limitations on arthropods.
A Guide to the Orders of Trilobites. Sam Gon III. An excellent site for learning about trilobites, one of the first classes of arthropods to diversify in the Paleozoic. Includes information about classification, ecology, and evolution, with abundant images and illustrations.
Trilobite eye. Sam Gone III. Trilobites developed some of the first eyes to see the world around them. This site explains how scientists can interpret how and what trilobites could see from their fossils
Trilobite Page. Peripatus. Good overview of trilobites; their morphogy, classification, origins, evolution, and extinction.
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