Some links to info about Arthropods:
ARTHROPODS
Aliens that have taken over the Earth!
http://www.mcwdn.org/Animals/Animals.html
http://tolweb.org/tree?group=Arthropoda&contgroup=Bilateria
http://www.ucmp.berkeley.edu/arthropoda/arthropoda.html
Introduction to Arthropoda -
http://entweb.clemson.edu/museum/
Clemson University Arthropod collection
http://www.ucmp.berkeley.edu/collections/otherent.html