Welcome to the electronic frontier classroom for the 21st century. You can find additional learning materials on my website called "Mitchell's Cosmic Adventure.com" The phylum Arthropoda means "jointed-foot." All members of this phylum have bilateral symmetry, hard exoskeleton, segmented bodies and jointed legs. This instrument will test your knowledge of external and internal anatomy of the crayfish. I hope you can use this as a learning tool and part laboratory practical for the dissection of the crayfish. Enjoy!