Comparative Anatomy: A Continuum
Web sites for animal systems information and images
Animal Diversity Web. University of Michigan, University of Michigan Museum of Zoology.
http://animaldiversity.ummz.umich.edu/index.html
The Electronic Zoo.
http://netvet.wustl.edu/ssi.htm
The On-Line Biology Book. Click on BIOLOGICAL DIVERSITY: ANIMALS I, II or III
http://gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookTOC.html
UCMP Taxon Lift. Select METAZOA (Animals), then choose your phyla. Created by the Museum of Paleontology, University of California, Berkeley.
http://www.ucmp.berkeley.edu/help/taxaform.html

Web sites addressing evaluation of web-based sources for credibility, and copyright issues. 
Five criteria for evaluating Web pages, from Cornell University Library
http://www.library.cornell.edu/olinuris/ref/webcrit.html
Evaluating Web pages: Techniques to apply and questions to ask, from the University of California - Berkeley
http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/Evaluate.html
Copyright basics, from Copyright Kids.org
http://www.copyrightkids.org/cbasicsframes.htm
Taking the mystery out of copyright, from the Library of Congress
http://www.loc.gov/teachers/copyrightmystery/

Web Sites addressing APA citation
APA formatting and style guide: The OWL at Purdue University
http://owl.english.purdue.edu/owl/resource/560/01/
Documenting Electronic Sources: the OWL at Purdue University
http://owl.english.purdue.edu/owl/resource/584/01/